<!-- doc/src/sgml/installation.sgml -->

<chapter id="installation">
 <title>Installation from Source Code</title>

 <indexterm zone="installation">
  <primary>installation</primary>
 </indexterm>

 <para>
  This chapter describes the installation of
  <productname>PostgreSQL</productname> using the source code
  distribution.  If you are installing a pre-packaged distribution,
  such as an RPM or Debian package, ignore this chapter
  and see <xref linkend="install-binaries" /> instead.
 </para>

 <sect1 id="install-requirements">
  <title>Requirements</title>

  <para>
   In general, a modern Unix-compatible platform should be able to run
   <productname>PostgreSQL</productname>.
   The platforms that had received specific testing at the
   time of release are described in <xref linkend="supported-platforms"/>
   below.
  </para>

  <para>
   The following software packages are required for building
   <productname>PostgreSQL</productname>:

   <itemizedlist>
    <listitem>
     <para>
      <indexterm>
       <primary>make</primary>
      </indexterm>

      <acronym>GNU</acronym> <application>make</application> version 3.81 or newer is required; other
      <application>make</application> programs or older <acronym>GNU</acronym> <application>make</application> versions will <emphasis>not</emphasis> work.
      (<acronym>GNU</acronym> <application>make</application> is sometimes installed under
      the name <filename>gmake</filename>.)  To test for <acronym>GNU</acronym>
      <application>make</application> enter:
<screen>
<userinput>make --version</userinput>
</screen>
     </para>
    </listitem>

    <listitem>
     <para>
      <indexterm>
       <primary>Meson</primary>
      </indexterm>

      Alternatively, <productname>PostgreSQL</productname> can be built using
      <ulink url="https://mesonbuild.com/">Meson</ulink>.  This is currently
      experimental.  If you choose to use
      <application>Meson</application>, then you don't need
      <acronym>GNU</acronym> <application>make</application>, but the other
      requirements below still apply.
     </para>

     <para>
      The minimum required version of <application>Meson</application> is 0.54.
     </para>
    </listitem>

    <listitem>
     <para>
      You need an <acronym>ISO</acronym>/<acronym>ANSI</acronym> C compiler (at least
      C99-compliant). Recent
      versions of <productname>GCC</productname> are recommended, but
      <productname>PostgreSQL</productname> is known to build using a wide variety
      of compilers from different vendors.
     </para>
    </listitem>

    <listitem>
     <para>
      <application>tar</application> is required to unpack the source
      distribution, in addition to either
      <application>gzip</application> or <application>bzip2</application>.
     </para>
    </listitem>

    <listitem>
     <para>
      <indexterm>
       <primary>flex</primary>
      </indexterm>
      <indexterm>
       <primary>lex</primary>
      </indexterm>
      <indexterm>
       <primary>bison</primary>
      </indexterm>
      <indexterm>
       <primary>yacc</primary>
      </indexterm>

      <application>Flex</application> 2.5.35 or later and
      <application>Bison</application> 2.3 or later are required.  Other
      <application>lex</application> and <application>yacc</application>
      programs cannot be used.
     </para>
    </listitem>

    <listitem>
     <para>
      <indexterm>
       <primary>perl</primary>
      </indexterm>

      <application>Perl</application> 5.14 or later is needed during the build
      process and to run some test suites.  (This requirement is separate from
      the requirements for building <application>PL/Perl</application>; see
      below.)
     </para>
    </listitem>

    <listitem>
     <para>
      <indexterm>
       <primary>readline</primary>
      </indexterm>
      <indexterm>
       <primary>libedit</primary>
      </indexterm>

      The <acronym>GNU</acronym> <productname>Readline</productname> library is used by
      default.  It allows <application>psql</application> (the
      PostgreSQL command line SQL interpreter) to remember each
      command you type, and allows you to use arrow keys to recall and
      edit previous commands.  This is very helpful and is strongly
      recommended.  If you don't want to use it then you must specify
      the <option>--without-readline</option> option to
      <filename>configure</filename>. As an alternative, you can often use the
      BSD-licensed <filename>libedit</filename> library, originally
      developed on <productname>NetBSD</productname>. The
      <filename>libedit</filename> library is
      GNU <productname>Readline</productname>-compatible and is used if
      <filename>libreadline</filename> is not found, or if
      <option>--with-libedit-preferred</option> is used as an
      option to <filename>configure</filename>. If you are using a package-based
      Linux distribution, be aware that you need both the
      <literal>readline</literal> and <literal>readline-devel</literal> packages, if
      those are separate in your distribution.
     </para>
    </listitem>

    <listitem>
     <para>
      <indexterm>
       <primary>zlib</primary>
      </indexterm>

      The <productname>zlib</productname> compression library is
      used by default. If you don't want to use it then you must
      specify the <option>--without-zlib</option> option to
      <filename>configure</filename>. Using this option disables
      support for compressed archives in <application>pg_dump</application> and
      <application>pg_restore</application>.
     </para>
    </listitem>

    <listitem>
     <para>
      The ICU library is used by default. If you don't want to use it then you must specify the <option>--without-icu</option> option to <filename>configure</filename>. Using this option disables support for ICU collation features (see <xref linkend="collation"/>).
     </para>
     <para>
      ICU support requires the <productname>ICU4C</productname> package to be
      installed.  The minimum required version of
      <productname>ICU4C</productname> is currently 4.2.
     </para>

     <para>
      By default,
      <productname>pkg-config</productname><indexterm><primary>pkg-config</primary></indexterm>
      will be used to find the required compilation options.  This is
      supported for <productname>ICU4C</productname> version 4.6 and later.
      For older versions, or if <productname>pkg-config</productname> is not
      available, the variables <envar>ICU_CFLAGS</envar> and
      <envar>ICU_LIBS</envar> can be specified to
      <filename>configure</filename>, like in this example:
<programlisting>
./configure ... ICU_CFLAGS='-I/some/where/include' ICU_LIBS='-L/some/where/lib -licui18n -licuuc -licudata'
</programlisting>
      (If <productname>ICU4C</productname> is in the default search path
      for the compiler, then you still need to specify nonempty strings in
      order to avoid use of <productname>pkg-config</productname>, for
      example, <literal>ICU_CFLAGS=' '</literal>.)
     </para>
    </listitem>
   </itemizedlist>
  </para>

  <para>
   The following packages are optional.  They are not required in the
   default configuration, but they are needed when certain build
   options are enabled, as explained below:

   <itemizedlist>
    <listitem>
     <para>
      To build the server programming language
      <application>PL/Perl</application> you need a full
      <productname>Perl</productname> installation, including the
      <filename>libperl</filename> library and the header files.
      The minimum required version is <productname>Perl</productname> 5.14.
      Since <application>PL/Perl</application> will be a shared
      library, the <indexterm><primary>libperl</primary></indexterm>
      <filename>libperl</filename> library must be a shared library
      also on most platforms.  This appears to be the default in
      recent <productname>Perl</productname> versions, but it was not
      in earlier versions, and in any case it is the choice of whomever
      installed Perl at your site.  <filename>configure</filename> will fail
      if building <application>PL/Perl</application> is selected but it cannot
      find a shared <filename>libperl</filename>.  In that case, you will have
      to rebuild and install <productname>Perl</productname> manually to be
      able to build <application>PL/Perl</application>.  During the
      configuration process for <productname>Perl</productname>, request a
      shared library.
     </para>

     <para>
      If you intend to make more than incidental use of
      <application>PL/Perl</application>, you should ensure that the
      <productname>Perl</productname> installation was built with the
      <literal>usemultiplicity</literal> option enabled (<literal>perl -V</literal>
      will show whether this is the case).
     </para>
    </listitem>

    <listitem>
     <para>
      To build the <application>PL/Python</application> server programming
      language, you need a <productname>Python</productname>
      installation with the header files and
      the <application>sysconfig</application> module.  The minimum
      required version is <productname>Python</productname> 3.2.
     </para>

     <para>
      Since <application>PL/Python</application> will be a shared
      library, the <indexterm><primary>libpython</primary></indexterm>
      <filename>libpython</filename> library must be a shared library
      also on most platforms.  This is not the case in a default
      <productname>Python</productname> installation built from source, but a
      shared library is available in many operating system
      distributions.  <filename>configure</filename> will fail if
      building <application>PL/Python</application> is selected but it cannot
      find a shared <filename>libpython</filename>.  That might mean that you
      either have to install additional packages or rebuild (part of) your
      <productname>Python</productname> installation to provide this shared
      library.  When building from source, run <productname>Python</productname>'s
      configure with the <literal>--enable-shared</literal> flag.
     </para>
    </listitem>

    <listitem>
     <para>
      To build the <application>PL/Tcl</application>
      procedural language, you of course need a <productname>Tcl</productname>
      installation.  The minimum required version is
      <productname>Tcl</productname> 8.4.
     </para>
    </listitem>

    <listitem>
     <para>
      To enable Native Language Support (<acronym>NLS</acronym>), that
      is, the ability to display a program's messages in a language
      other than English, you need an implementation of the
      <application>Gettext</application> <acronym>API</acronym>.  Some operating
      systems have this built-in (e.g., <systemitem
      class="osname">Linux</systemitem>, <systemitem class="osname">NetBSD</systemitem>,
      <systemitem class="osname">Solaris</systemitem>), for other systems you
      can download an add-on package from <ulink
      url="https://www.gnu.org/software/gettext/"></ulink>.
      If you are using the <application>Gettext</application> implementation in
      the <acronym>GNU</acronym> C library, then you will additionally
      need the <productname>GNU Gettext</productname> package for some
      utility programs.  For any of the other implementations you will
      not need it.
     </para>
    </listitem>

    <listitem>
     <para>
      You need <productname>OpenSSL</productname>, if you want to support
      encrypted client connections.  <productname>OpenSSL</productname> is
      also required for random number generation on platforms that do not
      have <filename>/dev/urandom</filename> (except Windows).  The minimum
      required version is 1.0.2.
     </para>
    </listitem>

    <listitem>
     <para>
      You need <application>MIT Kerberos</application> (for GSSAPI),
      <productname>OpenLDAP</productname>, and/or <application>PAM</application>,
      if you want to support authentication using those services.
     </para>
    </listitem>

    <listitem>
     <para>
      You need <productname>LZ4</productname>, if you want to support
      compression of data with that method; see
      <xref linkend="guc-default-toast-compression"/> and
      <xref linkend="guc-wal-compression"/>.
     </para>
    </listitem>

    <listitem>
     <para>
      You need <productname>Zstandard</productname>, if you want to support
      compression of data with that method; see
      <xref linkend="guc-wal-compression"/>.
      The minimum required version is 1.4.0.
     </para>
    </listitem>

    <listitem>
     <para>
      To build the <productname>PostgreSQL</productname> documentation,
      there is a separate set of requirements; see
      <xref linkend="docguide-toolsets"/>.
     </para>
    </listitem>
   </itemizedlist>
  </para>

  <para>
   If you need to get a <acronym>GNU</acronym> package, you can find
   it at your local <acronym>GNU</acronym> mirror site (see <ulink
   url="https://www.gnu.org/prep/ftp"></ulink>
   for a list) or at <ulink
   url="ftp://ftp.gnu.org/gnu/"></ulink>.
  </para>
 </sect1>

 <sect1 id="install-getsource">
  <title>Getting the Source</title>

  <para>
   The <productname>PostgreSQL</productname> source code for released versions
   can be obtained from the download section of our website:
   <ulink url="https://www.postgresql.org/ftp/source/"></ulink>.
   Download the
   <filename>postgresql-<replaceable>version</replaceable>.tar.gz</filename>
   or <filename>postgresql-<replaceable>version</replaceable>.tar.bz2</filename>
   file you're interested in, then unpack it:
<screen>
<userinput>tar xf postgresql-<replaceable>version</replaceable>.tar.bz2</userinput>
</screen>
   This will create a directory
   <filename>postgresql-<replaceable>version</replaceable></filename> under
   the current directory with the <productname>PostgreSQL</productname> sources.
   Change into that directory for the rest of the installation procedure.
  </para>

  <para>
   Alternatively, you can use the Git version control system; see
   <xref linkend="git"/> for more information.
  </para>
 </sect1>

 <sect1 id="install-make">
  <title>Building and Installation with Autoconf and Make</title>

 <sect2 id="install-short-make">
  <title>Short Version</title>

  <para>
<synopsis>
./configure
make
su
make install
adduser postgres
mkdir -p /usr/local/pgsql/data
chown postgres /usr/local/pgsql/data
su - postgres
/usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data
/usr/local/pgsql/bin/pg_ctl -D /usr/local/pgsql/data -l logfile start
/usr/local/pgsql/bin/createdb test
/usr/local/pgsql/bin/psql test
</synopsis>
   The long version is the rest of this
   <phrase>section</phrase>.
  </para>
 </sect2>


 <sect2 id="install-procedure-make">
  <title>Installation Procedure</title>

  <procedure>

  <step id="configure">
   <title>Configuration</title>

   <indexterm zone="configure">
    <primary>configure</primary>
   </indexterm>

   <para>
    The first step of the installation procedure is to configure the
    source tree for your system and choose the options you would like.
    This is done by running the <filename>configure</filename> script. For a
    default installation simply enter:
<screen>
<userinput>./configure</userinput>
</screen>
    This script will run a number of tests to determine values for various
    system dependent variables and detect any quirks of your
    operating system, and finally will create several files in the
    build tree to record what it found.
   </para>

   <para>
    You can also run <filename>configure</filename> in a directory outside
    the source tree, and then build there, if you want to keep the build
    directory separate from the original source files.  This procedure is
    called a
    <indexterm><primary>VPATH</primary></indexterm><firstterm>VPATH</firstterm>
    build.  Here's how:
<screen>
<userinput>mkdir build_dir</userinput>
<userinput>cd build_dir</userinput>
<userinput>/path/to/source/tree/configure [options go here]</userinput>
<userinput>make</userinput>
</screen>
   </para>

   <para>
    The default configuration will build the server and utilities, as
    well as all client applications and interfaces that require only a
    C compiler. All files will be installed under
    <filename>/usr/local/pgsql</filename> by default.
   </para>

   <para>
    You can customize the build and installation process by supplying one
    or more command line options to <filename>configure</filename>.
    Typically you would customize the install location, or the set of
    optional features that are built.  <filename>configure</filename>
    has a large number of options, which are described in
    <xref linkend="configure-options"/>.
   </para>

   <para>
    Also, <filename>configure</filename> responds to certain environment
    variables, as described in <xref linkend="configure-envvars"/>.
    These provide additional ways to customize the configuration.
   </para>
  </step>

  <step id="build">
   <title>Build</title>

   <para>
    To start the build, type either of:
<screen>
<userinput>make</userinput>
<userinput>make all</userinput>
</screen>
    (Remember to use <acronym>GNU</acronym> <application>make</application>.)
    The build will take a few minutes depending on your
    hardware.
   </para>

  <para>
   If you want to build everything that can be built, including the
   documentation (HTML and man pages), and the additional modules
   (<filename>contrib</filename>), type instead:
<screen>
<userinput>make world</userinput>
</screen>
  </para>

  <para>
   If you want to build everything that can be built, including the
   additional modules (<filename>contrib</filename>), but without
   the documentation, type instead:
<screen>
<userinput>make world-bin</userinput>
</screen>
   </para>

   <para>
    If you want to invoke the build from another makefile rather than
    manually, you must unset <varname>MAKELEVEL</varname> or set it to zero,
    for instance like this:
<programlisting>
build-postgresql:
        $(MAKE) -C postgresql MAKELEVEL=0 all
</programlisting>
    Failure to do that can lead to strange error messages, typically about
    missing header files.
   </para>
  </step>

  <step>
   <title>Regression Tests</title>

   <indexterm>
    <primary>regression test</primary>
   </indexterm>

   <para>
    If you want to test the newly built server before you install it,
    you can run the regression tests at this point. The regression
    tests are a test suite to verify that <productname>PostgreSQL</productname>
    runs on your machine in the way the developers expected it
    to. Type:
<screen>
<userinput>make check</userinput>
</screen>
    (This won't work as root; do it as an unprivileged user.)
    See <xref linkend="regress"/> for
    detailed information about interpreting the test results. You can
    repeat this test at any later time by issuing the same command.
   </para>
  </step>

  <step id="install">
   <title>Installing the Files</title>

   <note>
    <para>
     If you are upgrading an existing system be sure to read
     <xref linkend="upgrading"/>,
     which has instructions about upgrading a
     cluster.
    </para>
   </note>

   <para>
    To install <productname>PostgreSQL</productname> enter:
<screen>
<userinput>make install</userinput>
</screen>
    This will install files into the directories that were specified
    in <xref linkend="configure"/>. Make sure that you have appropriate
    permissions to write into that area. Normally you need to do this
    step as root. Alternatively, you can create the target
    directories in advance and arrange for appropriate permissions to
    be granted.
   </para>

   <para>
    To install the documentation (HTML and man pages), enter:
<screen>
<userinput>make install-docs</userinput>
</screen>
   </para>

   <para>
    If you built the world above, type instead:
<screen>
<userinput>make install-world</userinput>
</screen>
    This also installs the documentation.
   </para>

   <para>
    If you built the world without the documentation above, type instead:
<screen>
<userinput>make install-world-bin</userinput>
</screen>
   </para>

   <para>
    You can use <literal>make install-strip</literal> instead of
    <literal>make install</literal> to strip the executable files and
    libraries as they are installed.  This will save some space.  If
    you built with debugging support, stripping will effectively
    remove the debugging support, so it should only be done if
    debugging is no longer needed.  <literal>install-strip</literal>
    tries to do a reasonable job saving space, but it does not have
    perfect knowledge of how to strip every unneeded byte from an
    executable file, so if you want to save all the disk space you
    possibly can, you will have to do manual work.
   </para>

   <para>
    The standard installation provides all the header files needed for client
    application development as well as for server-side program
    development, such as custom functions or data types written in C.
   </para>

   <formalpara>
    <title>Client-only installation:</title>
    <para>
     If you want to install only the client applications and
     interface libraries, then you can use these commands:
<screen>
<userinput>make -C src/bin install</userinput>
<userinput>make -C src/include install</userinput>
<userinput>make -C src/interfaces install</userinput>
<userinput>make -C doc install</userinput>
</screen>
    <filename>src/bin</filename> has a few binaries for server-only use,
    but they are small.
    </para>
   </formalpara>
  </step>
  </procedure>

  <formalpara>
   <title>Uninstallation:</title>
   <para>
    To undo the installation use the command <command>make
    uninstall</command>. However, this will not remove any created directories.
   </para>
  </formalpara>

  <formalpara>
   <title>Cleaning:</title>

   <para>
    After the installation you can free disk space by removing the built
    files from the source tree with the command <command>make
    clean</command>. This will preserve the files made by the <command>configure</command>
    program, so that you can rebuild everything with <command>make</command>
    later on. To reset the source tree to the state in which it was
    distributed, use <command>make distclean</command>. If you are going to
    build for several platforms within the same source tree you must do
    this and re-configure for each platform.  (Alternatively, use
    a separate build tree for each platform, so that the source tree
    remains unmodified.)
   </para>
  </formalpara>

  <para>
   If you perform a build and then discover that your <command>configure</command>
   options were wrong, or if you change anything that <command>configure</command>
   investigates (for example, software upgrades), then it's a good
   idea to do <command>make distclean</command> before reconfiguring and
   rebuilding.  Without this, your changes in configuration choices
   might not propagate everywhere they need to.
  </para>
  </sect2>

  <sect2 id="configure-options">
   <title><filename>configure</filename> Options</title>

   <indexterm zone="configure-options">
    <primary>configure options</primary>
   </indexterm>

   <para>
    <command>configure</command>'s command line options are explained below.
    This list is not exhaustive (use <literal>./configure --help</literal>
    to get one that is).  The options not covered here are meant for
    advanced use-cases such as cross-compilation, and are documented in
    the standard Autoconf documentation.
   </para>

   <sect3 id="configure-options-locations">
    <title>Installation Locations</title>

     <para>
      These options control where <literal>make install</literal> will put
      the files.  The <option>--prefix</option> option is sufficient for
      most cases.  If you have special needs, you can customize the
      installation subdirectories with the other options described in this
      section.  Beware however that changing the relative locations of the
      different subdirectories may render the installation non-relocatable,
      meaning you won't be able to move it after installation.
      (The <literal>man</literal> and <literal>doc</literal> locations are
      not affected by this restriction.)  For relocatable installs, you
      might want to use the <literal>--disable-rpath</literal> option
      described later.
     </para>

     <variablelist>
      <varlistentry id="configure-option-prefix">
       <term><option>--prefix=<replaceable>PREFIX</replaceable></option></term>
       <listitem>
        <para>
         Install all files under the directory <replaceable>PREFIX</replaceable>
         instead of <filename>/usr/local/pgsql</filename>. The actual
         files will be installed into various subdirectories; no files
         will ever be installed directly into the
         <replaceable>PREFIX</replaceable> directory.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-exec-prefix">
       <term><option>--exec-prefix=<replaceable>EXEC-PREFIX</replaceable></option></term>
       <listitem>
        <para>
         You can install architecture-dependent files under a
         different prefix, <replaceable>EXEC-PREFIX</replaceable>, than what
         <replaceable>PREFIX</replaceable> was set to. This can be useful to
         share architecture-independent files between hosts. If you
         omit this, then <replaceable>EXEC-PREFIX</replaceable> is set equal to
         <replaceable>PREFIX</replaceable> and both architecture-dependent and
         independent files will be installed under the same tree,
         which is probably what you want.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-bindir">
       <term><option>--bindir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Specifies the directory for executable programs. The default
         is <filename><replaceable>EXEC-PREFIX</replaceable>/bin</filename>, which
         normally means <filename>/usr/local/pgsql/bin</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-sysconfdir">
       <term><option>--sysconfdir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the directory for various configuration files,
         <filename><replaceable>PREFIX</replaceable>/etc</filename> by default.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-libdir">
       <term><option>--libdir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the location to install libraries and dynamically loadable
         modules. The default is
         <filename><replaceable>EXEC-PREFIX</replaceable>/lib</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-includedir">
       <term><option>--includedir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the directory for installing C and C++ header files. The
         default is <filename><replaceable>PREFIX</replaceable>/include</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-datarootdir">
       <term><option>--datarootdir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the root directory for various types of read-only data
         files.  This only sets the default for some of the following
         options.  The default is
         <filename><replaceable>PREFIX</replaceable>/share</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-datadir">
       <term><option>--datadir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the directory for read-only data files used by the
         installed programs. The default is
         <filename><replaceable>DATAROOTDIR</replaceable></filename>. Note that this has
         nothing to do with where your database files will be placed.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-localedir">
       <term><option>--localedir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the directory for installing locale data, in particular
         message translation catalog files.  The default is
         <filename><replaceable>DATAROOTDIR</replaceable>/locale</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-mandir">
       <term><option>--mandir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         The man pages that come with <productname>PostgreSQL</productname> will be installed under
         this directory, in their respective
         <filename>man<replaceable>x</replaceable></filename> subdirectories.
         The default is <filename><replaceable>DATAROOTDIR</replaceable>/man</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-docdir">
       <term><option>--docdir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the root directory for installing documentation files,
         except <quote>man</quote> pages.  This only sets the default for
         the following options.  The default value for this option is
         <filename><replaceable>DATAROOTDIR</replaceable>/doc/postgresql</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-htmldir">
       <term><option>--htmldir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         The HTML-formatted documentation for
         <productname>PostgreSQL</productname> will be installed under
         this directory.  The default is
         <filename><replaceable>DATAROOTDIR</replaceable></filename>.
        </para>
       </listitem>
      </varlistentry>
     </variablelist>

     <note>
      <para>
       Care has been taken to make it possible to install
       <productname>PostgreSQL</productname> into shared installation locations
       (such as <filename>/usr/local/include</filename>) without
       interfering with the namespace of the rest of the system. First,
       the string <quote><literal>/postgresql</literal></quote> is
       automatically appended to <varname>datadir</varname>,
       <varname>sysconfdir</varname>, and <varname>docdir</varname>,
       unless the fully expanded directory name already contains the
       string <quote><literal>postgres</literal></quote> or
       <quote><literal>pgsql</literal></quote>. For example, if you choose
       <filename>/usr/local</filename> as prefix, the documentation will
       be installed in <filename>/usr/local/doc/postgresql</filename>,
       but if the prefix is <filename>/opt/postgres</filename>, then it
       will be in <filename>/opt/postgres/doc</filename>. The public C
       header files of the client interfaces are installed into
       <varname>includedir</varname> and are namespace-clean. The
       internal header files and the server header files are installed
       into private directories under <varname>includedir</varname>. See
       the documentation of each interface for information about how to
       access its header files. Finally, a private subdirectory will
       also be created, if appropriate, under <varname>libdir</varname>
       for dynamically loadable modules.
      </para>
     </note>

   </sect3>

   <sect3 id="configure-options-features">
    <title><productname>PostgreSQL</productname> Features</title>

    <para>
     The options described in this section enable building of
     various <productname>PostgreSQL</productname> features that are not
     built by default.  Most of these are non-default only because they
     require additional software, as described in
     <xref linkend="install-requirements"/>.
    </para>

     <variablelist>

      <varlistentry id="configure-option-enable-nls">
       <term><option>--enable-nls<optional>=<replaceable>LANGUAGES</replaceable></optional></option></term>
       <listitem>
        <para>
         Enables Native Language Support (<acronym>NLS</acronym>),
         that is, the ability to display a program's messages in a
         language other than English.
         <replaceable>LANGUAGES</replaceable> is an optional space-separated
         list of codes of the languages that you want supported, for
         example <literal>--enable-nls='de fr'</literal>.  (The intersection
         between your list and the set of actually provided
         translations will be computed automatically.)  If you do not
         specify a list, then all available translations are
         installed.
        </para>

        <para>
         To use this option, you will need an implementation of the
         <application>Gettext</application> API.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-perl">
       <term><option>--with-perl</option></term>
       <listitem>
        <para>
         Build the <application>PL/Perl</application> server-side language.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-python">
       <term><option>--with-python</option></term>
       <listitem>
        <para>
         Build the <application>PL/Python</application> server-side language.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-tcl">
       <term><option>--with-tcl</option></term>
       <listitem>
        <para>
         Build the <application>PL/Tcl</application> server-side language.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-tclconfig">
       <term><option>--with-tclconfig=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Tcl installs the file <filename>tclConfig.sh</filename>, which
         contains configuration information needed to build modules
         interfacing to Tcl. This file is normally found automatically
         at a well-known location, but if you want to use a different
         version of Tcl you can specify the directory in which to look
         for <filename>tclConfig.sh</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-with-llvm">
       <term><option>--with-llvm</option></term>
       <listitem>
        <para>
         Build with support for <productname>LLVM</productname> based
         <acronym>JIT</acronym> compilation (see <xref linkend="jit"/>).  This
         requires the <productname>LLVM</productname> library to be installed.
         The minimum required version of <productname>LLVM</productname> is
         currently 10.
        </para>
        <para>
         <command>llvm-config</command><indexterm><primary>llvm-config</primary></indexterm>
         will be used to find the required compilation options.
         <command>llvm-config</command>, and then
         <command>llvm-config-$major-$minor</command> for all supported
         versions, will be searched for in your <envar>PATH</envar>.  If
         that would not yield the desired program,
         use <envar>LLVM_CONFIG</envar> to specify a path to the
         correct <command>llvm-config</command>. For example
<programlisting>
./configure ... --with-llvm LLVM_CONFIG='/path/to/llvm/bin/llvm-config'
</programlisting>
        </para>

        <para>
         <productname>LLVM</productname> support requires a compatible
         <command>clang</command> compiler (specified, if necessary, using the
         <envar>CLANG</envar> environment variable), and a working C++
         compiler (specified, if necessary, using the <envar>CXX</envar>
         environment variable).
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-lz4">
       <term><option>--with-lz4</option></term>
       <listitem>
        <para>
         Build with <productname>LZ4</productname> compression support.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-zstd">
       <term><option>--with-zstd</option></term>
       <listitem>
        <para>
         Build with <productname>Zstandard</productname> compression support.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-ssl">
       <term><option>--with-ssl=<replaceable>LIBRARY</replaceable></option>
       <indexterm>
        <primary>OpenSSL</primary>
        <seealso>SSL</seealso>
       </indexterm>
       </term>
       <listitem>
        <para>
         Build with support for <acronym>SSL</acronym> (encrypted)
         connections. The only <replaceable>LIBRARY</replaceable>
         supported is <option>openssl</option>. This requires the
         <productname>OpenSSL</productname> package to be installed.
         <filename>configure</filename> will check for the required
         header files and libraries to make sure that your
         <productname>OpenSSL</productname> installation is sufficient
         before proceeding.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-openssl">
       <term><option>--with-openssl</option></term>
       <listitem>
        <para>
         Obsolete equivalent of <literal>--with-ssl=openssl</literal>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-gssapi">
       <term><option>--with-gssapi</option></term>
       <listitem>
        <para>
         Build with support for GSSAPI authentication. MIT Kerberos is required
         to be installed for GSSAPI.  On many systems, the GSSAPI system (a part
         of the MIT Kerberos installation) is not installed in a location
         that is searched by default (e.g., <filename>/usr/include</filename>,
         <filename>/usr/lib</filename>), so you must use the options
         <option>--with-includes</option> and <option>--with-libraries</option> in
         addition to this option.  <filename>configure</filename> will check
         for the required header files and libraries to make sure that
         your GSSAPI installation is sufficient before proceeding.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-ldap">
       <term><option>--with-ldap</option></term>
       <listitem>
        <para>
         Build with <acronym>LDAP</acronym><indexterm><primary>LDAP</primary></indexterm>
         support for authentication and connection parameter lookup (see
         <phrase id="install-ldap-links"><xref linkend="libpq-ldap"/> and
         <xref linkend="auth-ldap"/></phrase> for more information). On Unix,
         this requires the <productname>OpenLDAP</productname> package to be
         installed. On Windows, the default <productname>WinLDAP</productname>
         library is used.  <filename>configure</filename> will check for the required
         header files and libraries to make sure that your
         <productname>OpenLDAP</productname> installation is sufficient before
         proceeding.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-pam">
       <term><option>--with-pam</option></term>
       <listitem>
        <para>
         Build with <acronym>PAM</acronym><indexterm><primary>PAM</primary></indexterm>
         (Pluggable Authentication Modules) support.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-bsd-auth">
       <term><option>--with-bsd-auth</option></term>
       <listitem>
        <para>
         Build with BSD Authentication support.
         (The BSD Authentication framework is
         currently only available on OpenBSD.)
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-systemd">
       <term><option>--with-systemd</option></term>
       <listitem>
        <para>
         Build with support
         for <application>systemd</application><indexterm><primary>systemd</primary></indexterm>
         service notifications.  This improves integration if the server
         is started under <application>systemd</application> but has no impact
         otherwise; see <xref linkend="server-start"/> for more
         information.  <application>libsystemd</application> and the
         associated header files need to be installed to use this option.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-bonjour">
       <term><option>--with-bonjour</option></term>
       <listitem>
        <para>
         Build with support for Bonjour automatic service discovery.
         This requires Bonjour support in your operating system.
         Recommended on macOS.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-uuid">
       <term><option>--with-uuid=<replaceable>LIBRARY</replaceable></option></term>
       <listitem>
        <para>
         Build the <xref linkend="uuid-ossp"/> module
         (which provides functions to generate UUIDs), using the specified
         UUID library.<indexterm><primary>UUID</primary></indexterm>
         <replaceable>LIBRARY</replaceable> must be one of:
        </para>
        <itemizedlist>
         <listitem>
          <para>
           <option>bsd</option> to use the UUID functions found in FreeBSD
           and some other BSD-derived systems
          </para>
         </listitem>
         <listitem>
          <para>
           <option>e2fs</option> to use the UUID library created by
           the <literal>e2fsprogs</literal> project; this library is present in most
           Linux systems and in macOS, and can be obtained for other
           platforms as well
          </para>
         </listitem>
         <listitem>
          <para>
           <option>ossp</option> to use the <ulink
           url="http://www.ossp.org/pkg/lib/uuid/">OSSP UUID library</ulink>
          </para>
         </listitem>
        </itemizedlist>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-ossp-uuid">
       <term><option>--with-ossp-uuid</option></term>
       <listitem>
        <para>
         Obsolete equivalent of <literal>--with-uuid=ossp</literal>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-libxml">
       <term><option>--with-libxml</option></term>
       <listitem>
        <para>
         Build with libxml2, enabling SQL/XML support.  Libxml2 version 2.6.23 or
         later is required for this feature.
        </para>

        <para>
         To detect the required compiler and linker options, PostgreSQL will
         query <command>pkg-config</command>, if that is installed and knows
         about libxml2.  Otherwise the program <command>xml2-config</command>,
         which is installed by libxml2, will be used if it is found.  Use
         of <command>pkg-config</command> is preferred, because it can deal
         with multi-architecture installations better.
        </para>

        <para>
         To use a libxml2 installation that is in an unusual location, you
         can set <command>pkg-config</command>-related environment
         variables (see its documentation), or set the environment variable
         <envar>XML2_CONFIG</envar> to point to
         the <command>xml2-config</command> program belonging to the libxml2
         installation, or set the variables <envar>XML2_CFLAGS</envar>
         and <envar>XML2_LIBS</envar>.  (If <command>pkg-config</command> is
         installed, then to override its idea of where libxml2 is you must
         either set <envar>XML2_CONFIG</envar> or set
         both <envar>XML2_CFLAGS</envar> and <envar>XML2_LIBS</envar> to
         nonempty strings.)
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-libxslt">
       <term><option>--with-libxslt</option></term>
       <listitem>
        <para>
         Build with libxslt, enabling the
         <xref linkend="xml2"/>
         module to perform XSL transformations of XML.
         <option>--with-libxml</option> must be specified as well.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-sepgsql">
       <term><option>--with-selinux</option></term>
       <listitem>
        <para>
         Build with SElinux support, enabling the <xref linkend="sepgsql"/>
         extension.
        </para>
       </listitem>
      </varlistentry>

     </variablelist>

   </sect3>

   <sect3 id="configure-options-anti-features">
    <title>Anti-Features</title>

    <para>
     The options described in this section allow disabling
     certain <productname>PostgreSQL</productname> features that are built
     by default, but which might need to be turned off if the required
     software or system features are not available.  Using these options is
     not recommended unless really necessary.
    </para>

     <variablelist>

      <varlistentry id="configure-option-without-icu">
       <term><option>--without-icu</option></term>
       <listitem>
        <para>
         Build without support for the
         <productname>ICU</productname><indexterm><primary>ICU</primary></indexterm>
         library, disabling the use of ICU collation features (see <xref
         linkend="collation"/>).
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-without-readline">
       <term><option>--without-readline</option></term>
       <listitem>
        <para>
         Prevents use of the <application>Readline</application> library
         (and <application>libedit</application> as well).  This option disables
         command-line editing and history in
         <application>psql</application>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-libedit-preferred">
       <term><option>--with-libedit-preferred</option></term>
       <listitem>
        <para>
         Favors the use of the BSD-licensed <application>libedit</application> library
         rather than GPL-licensed <application>Readline</application>.  This option
         is significant only if you have both libraries installed; the
         default in that case is to use <application>Readline</application>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-without-zlib">
       <term><option>--without-zlib</option></term>
       <listitem>
        <para>
         <indexterm>
          <primary>zlib</primary>
         </indexterm>
         Prevents use of the <application>Zlib</application> library.
         This disables
         support for compressed archives in <application>pg_dump</application>
         and <application>pg_restore</application>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-disable-spinlocks">
       <term><option>--disable-spinlocks</option></term>
       <listitem>
        <para>
         Allow the build to succeed even if <productname>PostgreSQL</productname>
         has no CPU spinlock support for the platform.  The lack of
         spinlock support will result in very poor performance; therefore,
         this option should only be used if the build aborts and
         informs you that the platform lacks spinlock support. If this
         option is required to build <productname>PostgreSQL</productname> on
         your platform, please report the problem to the
         <productname>PostgreSQL</productname> developers.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-disable-atomics">
       <term><option>--disable-atomics</option></term>
       <listitem>
        <para>
         Disable use of CPU atomic operations.  This option does nothing on
         platforms that lack such operations.  On platforms that do have
         them, this will result in poor performance.  This option is only
         useful for debugging or making performance comparisons.
        </para>
       </listitem>
      </varlistentry>

     </variablelist>

   </sect3>

   <sect3 id="configure-options-build-process">
    <title>Build Process Details</title>

     <variablelist>

      <varlistentry id="configure-option-with-includes">
       <term><option>--with-includes=<replaceable>DIRECTORIES</replaceable></option></term>
       <listitem>
        <para>
         <replaceable>DIRECTORIES</replaceable> is a colon-separated list of
         directories that will be added to the list the compiler
         searches for header files. If you have optional packages
         (such as GNU <application>Readline</application>) installed in a non-standard
         location,
         you have to use this option and probably also the corresponding
         <option>--with-libraries</option> option.
        </para>
        <para>
         Example: <literal>--with-includes=/opt/gnu/include:/usr/sup/include</literal>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-libraries">
       <term><option>--with-libraries=<replaceable>DIRECTORIES</replaceable></option></term>
       <listitem>
        <para>
         <replaceable>DIRECTORIES</replaceable> is a colon-separated list of
         directories to search for libraries. You will probably have
         to use this option (and the corresponding
         <option>--with-includes</option> option) if you have packages
         installed in non-standard locations.
        </para>
        <para>
         Example: <literal>--with-libraries=/opt/gnu/lib:/usr/sup/lib</literal>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-system-tzdata">
       <term><option>--with-system-tzdata=<replaceable>DIRECTORY</replaceable></option>
       <indexterm>
        <primary>time zone data</primary>
       </indexterm>
       </term>
       <listitem>
        <para>
         <productname>PostgreSQL</productname> includes its own time zone database,
         which it requires for date and time operations.  This time zone
         database is in fact compatible with the IANA time zone
         database provided by many operating systems such as FreeBSD,
         Linux, and Solaris, so it would be redundant to install it again.
         When this option is used, the system-supplied time zone database
         in <replaceable>DIRECTORY</replaceable> is used instead of the one
         included in the PostgreSQL source distribution.
         <replaceable>DIRECTORY</replaceable> must be specified as an
         absolute path.  <filename>/usr/share/zoneinfo</filename> is a
         likely directory on some operating systems.  Note that the
         installation routine will not detect mismatching or erroneous time
         zone data.  If you use this option, you are advised to run the
         regression tests to verify that the time zone data you have
         pointed to works correctly with <productname>PostgreSQL</productname>.
        </para>

        <indexterm><primary>cross compilation</primary></indexterm>

        <para>
         This option is mainly aimed at binary package distributors
         who know their target operating system well.  The main
         advantage of using this option is that the PostgreSQL package
         won't need to be upgraded whenever any of the many local
         daylight-saving time rules change.  Another advantage is that
         PostgreSQL can be cross-compiled more straightforwardly if the
         time zone database files do not need to be built during the
         installation.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-extra-version">
       <term><option>--with-extra-version=<replaceable>STRING</replaceable></option></term>
       <listitem>
        <para>
         Append <replaceable>STRING</replaceable> to the PostgreSQL version number.  You
         can use this, for example, to mark binaries built from unreleased Git
         snapshots or containing custom patches with an extra version string,
         such as a <command>git describe</command> identifier or a
         distribution package release number.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-disable-rpath">
       <term><option>--disable-rpath</option></term>
       <listitem>
        <para>
         Do not mark <productname>PostgreSQL</productname>'s executables
         to indicate that they should search for shared libraries in the
         installation's library directory (see <option>--libdir</option>).
         On most platforms, this marking uses an absolute path to the
         library directory, so that it will be unhelpful if you relocate
         the installation later.  However, you will then need to provide
         some other way for the executables to find the shared libraries.
         Typically this requires configuring the operating system's
         dynamic linker to search the library directory; see
         <xref linkend="install-post-shlibs"/> for more detail.
        </para>
       </listitem>
      </varlistentry>

     </variablelist>

   </sect3>

   <sect3 id="configure-options-misc">
    <title>Miscellaneous</title>

    <para>
     It's fairly common, particularly for test builds, to adjust the
     default port number with <option>--with-pgport</option>.
     The other options in this section are recommended only for advanced
     users.
    </para>

     <variablelist>

      <varlistentry id="configure-option-with-pgport">
       <term><option>--with-pgport=<replaceable>NUMBER</replaceable></option></term>
       <listitem>
        <para>
         Set <replaceable>NUMBER</replaceable> as the default port number for
         server and clients. The default is 5432. The port can always
         be changed later on, but if you specify it here then both
         server and clients will have the same default compiled in,
         which can be very convenient.  Usually the only good reason
         to select a non-default value is if you intend to run multiple
         <productname>PostgreSQL</productname> servers on the same machine.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-krb-srvnam">
       <term><option>--with-krb-srvnam=<replaceable>NAME</replaceable></option></term>
       <listitem>
        <para>
         The default name of the Kerberos service principal used
         by GSSAPI.
         <literal>postgres</literal> is the default. There's usually no
         reason to change this unless you are building for a Windows
         environment, in which case it must be set to upper case
         <literal>POSTGRES</literal>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-segsize">
       <term><option>--with-segsize=<replaceable>SEGSIZE</replaceable></option></term>
       <listitem>
        <para>
         Set the <firstterm>segment size</firstterm>, in gigabytes.  Large tables are
         divided into multiple operating-system files, each of size equal
         to the segment size.  This avoids problems with file size limits
         that exist on many platforms.  The default segment size, 1 gigabyte,
         is safe on all supported platforms.  If your operating system has
         <quote>largefile</quote> support (which most do, nowadays), you can use
         a larger segment size.  This can be helpful to reduce the number of
         file descriptors consumed when working with very large tables.
         But be careful not to select a value larger than is supported
         by your platform and the file systems you intend to use.  Other
         tools you might wish to use, such as <application>tar</application>, could
         also set limits on the usable file size.
         It is recommended, though not absolutely required, that this value
         be a power of 2.
         Note that changing this value breaks on-disk database compatibility,
         meaning you cannot use <command>pg_upgrade</command> to upgrade to
         a build with a different segment size.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-blocksize">
       <term><option>--with-blocksize=<replaceable>BLOCKSIZE</replaceable></option></term>
       <listitem>
        <para>
         Set the <firstterm>block size</firstterm>, in kilobytes.  This is the unit
         of storage and I/O within tables.  The default, 8 kilobytes,
         is suitable for most situations; but other values may be useful
         in special cases.
         The value must be a power of 2 between 1 and 32 (kilobytes).
         Note that changing this value breaks on-disk database compatibility,
         meaning you cannot use <command>pg_upgrade</command> to upgrade to
         a build with a different block size.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-wal-blocksize">
       <term><option>--with-wal-blocksize=<replaceable>BLOCKSIZE</replaceable></option></term>
       <listitem>
        <para>
         Set the <firstterm>WAL block size</firstterm>, in kilobytes.  This is the unit
         of storage and I/O within the WAL log.  The default, 8 kilobytes,
         is suitable for most situations; but other values may be useful
         in special cases.
         The value must be a power of 2 between 1 and 64 (kilobytes).
         Note that changing this value breaks on-disk database compatibility,
         meaning you cannot use <command>pg_upgrade</command> to upgrade to
         a build with a different WAL block size.
        </para>
       </listitem>
      </varlistentry>

     </variablelist>

   </sect3>

   <sect3 id="configure-options-devel">
    <title>Developer Options</title>

    <para>
     Most of the options in this section are only of interest for
     developing or debugging <productname>PostgreSQL</productname>.
     They are not recommended for production builds, except
     for <option>--enable-debug</option>, which can be useful to enable
     detailed bug reports in the unlucky event that you encounter a bug.
     On platforms supporting DTrace, <option>--enable-dtrace</option>
     may also be reasonable to use in production.
    </para>

    <para>
     When building an installation that will be used to develop code inside
     the server, it is recommended to use at least the
     options <option>--enable-debug</option>
     and <option>--enable-cassert</option>.
    </para>

     <variablelist>

      <varlistentry id="configure-option-enable-debug">
       <term><option>--enable-debug</option></term>
       <listitem>
        <para>
         Compiles all programs and libraries with debugging symbols.
         This means that you can run the programs in a debugger
         to analyze problems. This enlarges the size of the installed
         executables considerably, and on non-GCC compilers it usually
         also disables compiler optimization, causing slowdowns. However,
         having the symbols available is extremely helpful for dealing
         with any problems that might arise.  Currently, this option is
         recommended for production installations only if you use GCC.
         But you should always have it on if you are doing development work
         or running a beta version.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-enable-cassert">
       <term><option>--enable-cassert</option></term>
       <listitem>
        <para>
         Enables <firstterm>assertion</firstterm> checks in the server, which test for
         many <quote>cannot happen</quote> conditions.  This is invaluable for
         code development purposes, but the tests can slow down the
         server significantly.
         Also, having the tests turned on won't necessarily enhance the
         stability of your server!  The assertion checks are not categorized
         for severity, and so what might be a relatively harmless bug will
         still lead to server restarts if it triggers an assertion
         failure.  This option is not recommended for production use, but
         you should have it on for development work or when running a beta
         version.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-enable-tap-tests">
       <term><option>--enable-tap-tests</option></term>
       <listitem>
        <para>
         Enable tests using the Perl TAP tools.  This requires a Perl
         installation and the Perl module <literal>IPC::Run</literal>.
         See <xref linkend="regress-tap"/> for more information.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-enable-depend">
       <term><option>--enable-depend</option></term>
       <listitem>
        <para>
         Enables automatic dependency tracking.  With this option, the
         makefiles are set up so that all affected object files will
         be rebuilt when any header file is changed.  This is useful
         if you are doing development work, but is just wasted overhead
         if you intend only to compile once and install.  At present,
         this option only works with GCC.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-enable-coverage">
       <term><option>--enable-coverage</option></term>
       <listitem>
        <para>
         If using GCC, all programs and libraries are compiled with
         code coverage testing instrumentation.  When run, they
         generate files in the build directory with code coverage
         metrics.
         See <xref linkend="regress-coverage"/>
         for more information. This option is for use only with GCC
         and when doing development work.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-enable-profiling">
       <term><option>--enable-profiling</option></term>
       <listitem>
        <para>
         If using GCC, all programs and libraries are compiled so they
         can be profiled.  On backend exit, a subdirectory will be created
         that contains the <filename>gmon.out</filename> file containing
         profile data.
         This option is for use only with GCC and when doing development work.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-enable-dtrace">
       <term><option>--enable-dtrace</option></term>
       <listitem>
        <para>
         <indexterm>
          <primary>DTrace</primary>
         </indexterm>
         Compiles <productname>PostgreSQL</productname> with support for the
         dynamic tracing tool DTrace.
         See <xref linkend="dynamic-trace"/> for more information.
        </para>

        <para>
         To point to the <command>dtrace</command> program, the
         environment variable <envar>DTRACE</envar> can be set.  This
         will often be necessary because <command>dtrace</command> is
         typically installed under <filename>/usr/sbin</filename>,
         which might not be in your <envar>PATH</envar>.
        </para>

        <para>
         Extra command-line options for the <command>dtrace</command> program
         can be specified in the environment variable
         <envar>DTRACEFLAGS</envar>.  On Solaris,
         to include DTrace support in a 64-bit binary, you must specify
         <literal>DTRACEFLAGS="-64"</literal>.  For example,
         using the GCC compiler:
<screen>
./configure CC='gcc -m64' --enable-dtrace DTRACEFLAGS='-64' ...
</screen>
         Using Sun's compiler:
<screen>
./configure CC='/opt/SUNWspro/bin/cc -xtarget=native64' --enable-dtrace DTRACEFLAGS='-64' ...
</screen>
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-enable-injection-points">
       <term><option>--enable-injection-points</option></term>
       <listitem>
        <para>
         Compiles <productname>PostgreSQL</productname> with support for
         injection points in the server. Injection points allow to run
         user-defined code from within the server in pre-defined code paths.
         This helps in testing and in the investigation of concurrency scenarios
         in a controlled fashion. This option is disabled by default.  See
         <xref linkend="xfunc-addin-injection-points"/> for more details.  This
         option is intended to be used only by developers for testing.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-option-with-segsize-blocks">
       <term><option>--with-segsize-blocks=SEGSIZE_BLOCKS</option></term>
       <listitem>
        <para>
         Specify the relation segment size in blocks. If both
         <option>--with-segsize</option> and this option are specified, this
         option wins.

         This option is only for developers, to test segment related code.
        </para>
       </listitem>
      </varlistentry>

     </variablelist>

   </sect3>

  </sect2>

  <sect2 id="configure-envvars">
   <title><filename>configure</filename> Environment Variables</title>

   <indexterm zone="configure-envvars">
    <primary>configure environment variables</primary>
   </indexterm>

    <para>
     In addition to the ordinary command-line options described above,
     <filename>configure</filename> responds to a number of environment
     variables.
     You can specify environment variables on the
     <filename>configure</filename> command line, for example:
<screen>
<userinput>./configure CC=/opt/bin/gcc CFLAGS='-O2 -pipe'</userinput>
</screen>
     In this usage an environment variable is little different from a
     command-line option.
     You can also set such variables beforehand:
<screen>
<userinput>export CC=/opt/bin/gcc</userinput>
<userinput>export CFLAGS='-O2 -pipe'</userinput>
<userinput>./configure</userinput>
</screen>
     This usage can be convenient because many programs' configuration
     scripts respond to these variables in similar ways.
    </para>

    <para>
     The most commonly used of these environment variables are
     <envar>CC</envar> and <envar>CFLAGS</envar>.
     If you prefer a C compiler different from the one
     <filename>configure</filename> picks, you can set the
     variable <envar>CC</envar> to the program of your choice.
     By default, <filename>configure</filename> will pick
     <filename>gcc</filename> if available, else the platform's
     default (usually <filename>cc</filename>).  Similarly, you can override the
     default compiler flags if needed with the <envar>CFLAGS</envar> variable.
    </para>

    <para>
     Here is a list of the significant variables that can be set in
     this manner:

     <variablelist>
      <varlistentry id="configure-envvars-bison">
       <term><envar>BISON</envar></term>
       <listitem>
        <para>
         Bison program
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-cc">
       <term><envar>CC</envar></term>
       <listitem>
        <para>
         C compiler
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-cflags">
       <term><envar>CFLAGS</envar></term>
       <listitem>
        <para>
         options to pass to the C compiler
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-clang">
       <term><envar>CLANG</envar></term>
       <listitem>
        <para>
         path to <command>clang</command> program used to process source code
         for inlining when compiling with <literal>--with-llvm</literal>
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-cpp">
       <term><envar>CPP</envar></term>
       <listitem>
        <para>
         C preprocessor
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-cppflags">
       <term><envar>CPPFLAGS</envar></term>
       <listitem>
        <para>
         options to pass to the C preprocessor
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-cxx">
       <term><envar>CXX</envar></term>
       <listitem>
        <para>
         C++ compiler
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-cxxflags">
       <term><envar>CXXFLAGS</envar></term>
       <listitem>
        <para>
         options to pass to the C++ compiler
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-dtrace">
       <term><envar>DTRACE</envar></term>
       <listitem>
        <para>
         location of the <command>dtrace</command> program
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-dtraceflags">
       <term><envar>DTRACEFLAGS</envar></term>
       <listitem>
        <para>
         options to pass to the <command>dtrace</command> program
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-flex">
       <term><envar>FLEX</envar></term>
       <listitem>
        <para>
         Flex program
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-ldflags">
       <term><envar>LDFLAGS</envar></term>
       <listitem>
        <para>
         options to use when linking either executables or shared libraries
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-ldflags-ex">
       <term><envar>LDFLAGS_EX</envar></term>
       <listitem>
        <para>
         additional options for linking executables only
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-ldflags-sl">
       <term><envar>LDFLAGS_SL</envar></term>
       <listitem>
        <para>
         additional options for linking shared libraries only
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-llvm-config">
       <term><envar>LLVM_CONFIG</envar></term>
       <listitem>
        <para>
         <command>llvm-config</command> program used to locate the
         <productname>LLVM</productname> installation
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-msgfmt">
       <term><envar>MSGFMT</envar></term>
       <listitem>
        <para>
         <command>msgfmt</command> program for native language support
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-perl">
       <term><envar>PERL</envar></term>
       <listitem>
        <para>
         Perl interpreter program.  This will be used to determine the
         dependencies for building PL/Perl.  The default is
         <command>perl</command>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-python">
       <term><envar>PYTHON</envar></term>
       <listitem>
        <para>
         Python interpreter program.  This will be used to determine the
         dependencies for building PL/Python.  If this is not set, the
         following are probed in this order:
         <literal>python3 python</literal>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-tclsh">
       <term><envar>TCLSH</envar></term>
       <listitem>
        <para>
         Tcl interpreter program.  This will be used to
         determine the dependencies for building PL/Tcl.
         If this is not set, the following are probed in this
         order: <literal>tclsh tcl tclsh8.6 tclsh86 tclsh8.5 tclsh85
         tclsh8.4 tclsh84</literal>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-envvars-xml2-config">
       <term><envar>XML2_CONFIG</envar></term>
       <listitem>
        <para>
         <command>xml2-config</command> program used to locate the
         libxml2 installation
        </para>
       </listitem>
      </varlistentry>
     </variablelist>
    </para>

    <para>
     Sometimes it is useful to add compiler flags after-the-fact to the set
     that were chosen by <filename>configure</filename>.  An important example is
     that <application>gcc</application>'s <option>-Werror</option> option cannot be included
     in the <envar>CFLAGS</envar> passed to <filename>configure</filename>, because
     it will break many of <filename>configure</filename>'s built-in tests.  To add
     such flags, include them in the <envar>COPT</envar> environment variable
     while running <filename>make</filename>.  The contents of <envar>COPT</envar>
     are added to both the <envar>CFLAGS</envar> and <envar>LDFLAGS</envar>
     options set up by <filename>configure</filename>.  For example, you could do
<screen>
<userinput>make COPT='-Werror'</userinput>
</screen>
     or
<screen>
<userinput>export COPT='-Werror'</userinput>
<userinput>make</userinput>
</screen>
    </para>

    <note>
     <para>
      If using GCC, it is best to build with an optimization level of
      at least <option>-O1</option>, because using no optimization
      (<option>-O0</option>) disables some important compiler warnings (such
      as the use of uninitialized variables).  However, non-zero
      optimization levels can complicate debugging because stepping
      through compiled code will usually not match up one-to-one with
      source code lines.  If you get confused while trying to debug
      optimized code, recompile the specific files of interest with
      <option>-O0</option>.  An easy way to do this is by passing an option
      to <application>make</application>: <command>make PROFILE=-O0 file.o</command>.
     </para>

     <para>
      The <envar>COPT</envar> and <envar>PROFILE</envar> environment variables are
      actually handled identically by the <productname>PostgreSQL</productname>
      makefiles.  Which to use is a matter of preference, but a common habit
      among developers is to use <envar>PROFILE</envar> for one-time flag
      adjustments, while <envar>COPT</envar> might be kept set all the time.
     </para>
    </note>
  </sect2>
 </sect1>

 <sect1 id="install-meson">
  <title>Building and Installation with Meson</title>

 <sect2 id="install-short-meson">
  <title>Short Version</title>

  <para>
<synopsis>
meson setup build --prefix=/usr/local/pgsql
cd build
ninja
su
ninja install
adduser postgres
mkdir -p /usr/local/pgsql/data
chown postgres /usr/local/pgsql/data
su - postgres
/usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data
/usr/local/pgsql/bin/pg_ctl -D /usr/local/pgsql/data -l logfile start
/usr/local/pgsql/bin/createdb test
/usr/local/pgsql/bin/psql test
</synopsis>
   The long version is the rest of this
   <phrase>section</phrase>.
  </para>
 </sect2>

 <sect2 id="install-procedure-meson">
  <title>Installation Procedure</title>

  <procedure>

  <step id="meson-configure">
   <title>Configuration</title>

   <para>
    The first step of the installation procedure is to configure the
    build tree for your system and choose the options you would like. To
    create and configure the build directory, you can start with the
    <literal>meson setup</literal> command.
<screen>
<userinput>meson setup build</userinput>
</screen>
    The setup command takes a <literal>builddir</literal> and a <literal>srcdir</literal>
    argument. If no <literal>srcdir</literal> is given, Meson will deduce the
    <literal>srcdir</literal> based on the current directory and the location
    of <literal>meson.build</literal>. The <literal>builddir</literal> is mandatory.
   </para>

   <para>
    Running <literal>meson setup</literal> loads the build configuration file and sets up the build directory.
    Additionally, you can also pass several build options to Meson. Some commonly
    used options are mentioned in the subsequent sections. For example:

<screen>
# configure with a different installation prefix
meson setup build --prefix=/home/user/pg-install

# configure to generate a debug build
meson setup build --buildtype=debug

# configure to build with OpenSSL support
meson setup build -Dssl=openssl
</screen>
   </para>

   <para>
    Setting up the build directory is a one-time step. To reconfigure before a
    new build, you can simply use the <literal>meson configure</literal> command
<screen>
meson configure -Dcassert=true
</screen>
    <command>meson configure</command>'s commonly used command-line options
    are explained in <xref linkend="meson-options"/>.
   </para>
  </step>

  <step id="meson-build">
   <title>Build</title>

   <para>
    By default, <productname>Meson</productname> uses the <ulink
    url="https://ninja-build.org/">Ninja</ulink> build tool.  To build
    <productname>PostgreSQL</productname> from source using Meson, you can
    simply use the <literal>ninja</literal> command in the build directory.
<screen>
ninja
</screen>
    Ninja will automatically detect the number of CPUs in your computer and
    parallelize itself accordingly. You can override the number of parallel
    processes used with the command line argument <literal>-j</literal>.
   </para>

   <para>
    It should be noted that after the initial configure step,
    <command>ninja</command> is the only command you ever need to type to
    compile. No matter how you alter your source tree (short of moving it to a
    completely new location), Meson will detect the changes and regenerate
    itself accordingly. This is especially handy if you have multiple build
    directories. Often one of them is used for development (the "debug" build)
    and others only every now and then (such as a "static analysis" build).
    Any configuration can be built just by cd'ing to the corresponding
    directory and running Ninja.
   </para>

   <para>
    If you'd like to build with a backend other than ninja, you can use
    configure with the <option>--backend</option> option to select the one you
    want to use and then build using <literal>meson compile</literal>. To
    learn more about these backends and other arguments you can provide to
    ninja, you can refer to the <ulink
    url="https://mesonbuild.com/Running-Meson.html#building-from-the-source">
    Meson documentation</ulink>.
   </para>
  </step>

  <step>
   <title>Regression Tests</title>

   <indexterm>
    <primary>regression test</primary>
   </indexterm>

   <para>
    If you want to test the newly built server before you install it,
    you can run the regression tests at this point. The regression
    tests are a test suite to verify that <productname>PostgreSQL</productname>
    runs on your machine in the way the developers expected it
    to. Type:
<screen>
<userinput>meson test</userinput>
</screen>
    (This won't work as root; do it as an unprivileged user.)
    See <xref linkend="regress"/> for
    detailed information about interpreting the test results. You can
    repeat this test at any later time by issuing the same command.
   </para>

   <para>
    To run pg_regress and pg_isolation_regress tests against a running
    postgres instance, specify <userinput>--setup running</userinput> as an
    argument to <userinput>meson test</userinput>.
   </para>
  </step>

  <step id="meson-install">
   <title>Installing the Files</title>

   <note>
    <para>
     If you are upgrading an existing system be sure to read
     <xref linkend="upgrading"/>,
     which has instructions about upgrading a
     cluster.
    </para>
   </note>

   <para>
    Once PostgreSQL is built, you can install it by simply running the
    <literal>ninja install</literal> command.
<screen>
ninja install
</screen>
   </para>

   <para>
    This will install files into the directories that were specified
    in <xref linkend="meson-configure"/>. Make sure that you have appropriate
    permissions to write into that area. You might need to do this
    step as root. Alternatively, you can create the target directories
    in advance and arrange for appropriate permissions to be granted.
    The standard installation provides all the header files needed for client
    application development as well as for server-side program
    development, such as custom functions or data types written in C.
   </para>

   <para>
    <literal>ninja install</literal> should work for most cases, but if you'd
    like to use more options (such as <option>--quiet</option> to suppress
    extra output), you could also use <literal>meson install</literal>
    instead. You can learn more about <ulink
    url="https://mesonbuild.com/Commands.html#install">meson install</ulink>
    and its options in the Meson documentation.
   </para>
  </step>
  </procedure>

  <formalpara>
   <title>Uninstallation:</title>
   <para>
    To undo the installation, you can use the <command>ninja
    uninstall</command> command.
   </para>
  </formalpara>

  <formalpara>
   <title>Cleaning:</title>
   <para>
    After the installation, you can free disk space by removing the built
    files from the source tree with the <command>ninja clean</command>
    command.
   </para>
  </formalpara>
  </sect2>

  <sect2 id="meson-options">
   <title><literal>meson setup</literal> Options</title>

   <para>
    <command>meson setup</command>'s command-line options are explained below.
    This list is not exhaustive (use <literal>meson configure --help</literal>
    to get one that is).  The options not covered here are meant for advanced
    use-cases, and are documented in the standard <ulink
    url="https://mesonbuild.com/Commands.html#configure">Meson
    documentation</ulink>.  These arguments can be used with <command>meson
    setup</command> as well.
   </para>

   <sect3 id="meson-options-locations">
    <title>Installation Locations</title>

     <para>
      These options control where <literal>ninja install</literal> (or <literal>meson install</literal>) will put
      the files.  The <option>--prefix</option> option (example
      <xref linkend="install-short-meson"/>) is sufficient for
      most cases.  If you have special needs, you can customize the
      installation subdirectories with the other options described in this
      section.  Beware however that changing the relative locations of the
      different subdirectories may render the installation non-relocatable,
      meaning you won't be able to move it after installation.
      (The <literal>man</literal> and <literal>doc</literal> locations are
      not affected by this restriction.)  For relocatable installs, you
      might want to use the <literal>-Drpath=false</literal> option
      described later.
     </para>

     <variablelist>
      <varlistentry id="configure-prefix-meson">
       <term><option>--prefix=<replaceable>PREFIX</replaceable></option></term>
       <listitem>
        <para>
         Install all files under the directory <replaceable>PREFIX</replaceable>
         instead of <filename>/usr/local/pgsql</filename> (on Unix based systems) or
         <filename><replaceable>current drive letter</replaceable>:/usr/local/pgsql</filename> (on Windows).
         The actual files will be installed into various subdirectories; no files
         will ever be installed directly into the
         <replaceable>PREFIX</replaceable> directory.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-bindir-meson">
       <term><option>--bindir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Specifies the directory for executable programs. The default
         is <filename><replaceable>PREFIX</replaceable>/bin</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-sysconfdir-meson">
       <term><option>--sysconfdir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the directory for various configuration files,
         <filename><replaceable>PREFIX</replaceable>/etc</filename> by default.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-libdir-meson">
       <term><option>--libdir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the location to install libraries and dynamically loadable
         modules. The default is
         <filename><replaceable>PREFIX</replaceable>/lib</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-includedir-meson">
       <term><option>--includedir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the directory for installing C and C++ header files. The
         default is <filename><replaceable>PREFIX</replaceable>/include</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-datadir-meson">
       <term><option>--datadir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the directory for read-only data files used by the
         installed programs. The default is
         <filename><replaceable>PREFIX</replaceable>/share</filename>. Note that this has
         nothing to do with where your database files will be placed.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-localedir-meson">
       <term><option>--localedir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         Sets the directory for installing locale data, in particular
         message translation catalog files.  The default is
         <filename><replaceable>DATADIR</replaceable>/locale</filename>.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry id="configure-mandir-meson">
       <term><option>--mandir=<replaceable>DIRECTORY</replaceable></option></term>
       <listitem>
        <para>
         The man pages that come with <productname>PostgreSQL</productname> will be installed under
         this directory, in their respective
         <filename>man<replaceable>x</replaceable></filename> subdirectories.
         The default is <filename><replaceable>DATADIR</replaceable>/man</filename>.
        </para>
       </listitem>
      </varlistentry>

     </variablelist>

     <note>
      <para>
       Care has been taken to make it possible to install
       <productname>PostgreSQL</productname> into shared installation locations
       (such as <filename>/usr/local/include</filename>) without
       interfering with the namespace of the rest of the system. First,
       the string <quote><literal>/postgresql</literal></quote> is
       automatically appended to <varname>datadir</varname>,
       <varname>sysconfdir</varname>, and <varname>docdir</varname>,
       unless the fully expanded directory name already contains the
       string <quote><literal>postgres</literal></quote> or
       <quote><literal>pgsql</literal></quote>. For example, if you choose
       <filename>/usr/local</filename> as prefix, the documentation will
       be installed in <filename>/usr/local/doc/postgresql</filename>,
       but if the prefix is <filename>/opt/postgres</filename>, then it
       will be in <filename>/opt/postgres/doc</filename>. The public C
       header files of the client interfaces are installed into
       <varname>includedir</varname> and are namespace-clean. The
       internal header files and the server header files are installed
       into private directories under <varname>includedir</varname>. See
       the documentation of each interface for information about how to
       access its header files. Finally, a private subdirectory will
       also be created, if appropriate, under <varname>libdir</varname>
       for dynamically loadable modules.
      </para>
     </note>
    </sect3>

   <sect3 id="meson-options-features">
    <title><productname>PostgreSQL</productname> Features</title>

    <para>
     The options described in this section enable building of
     various optional <productname>PostgreSQL</productname> features.
     Most of these require additional software, as described in
     <xref linkend="install-requirements"/>, and will be automatically enabled if the
     required software is found. You can change this behavior by manually
     setting these features to <literal>enabled</literal> to require them
     or <literal>disabled</literal> to not build with them.
    </para>

    <para>
     To specify PostgreSQL-specific options, the name of the option
     must be prefixed by <literal>-D</literal>.
    </para>

    <variablelist>
     <varlistentry id="configure-with-nls-meson">
      <term><option>-Dnls={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Enables or disables Native Language Support (<acronym>NLS</acronym>),
        that is, the ability to display a program's messages in a language
        other than English.  Defaults to auto and will be enabled
        automatically if an implementation of the <application>Gettext
        API</application> is found.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-plperl-meson">
      <term><option>-Dplperl={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build the <application>PL/Perl</application> server-side language.
        Defaults to auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-plpython-meson">
      <term><option>-Dplpython={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build the <application>PL/Python</application> server-side language.
        Defaults to auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-pltcl-meson">
      <term><option>-Dpltcl={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build the <application>PL/Tcl</application> server-side language.
        Defaults to auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-tcl-version-meson">
      <term><option>-Dtcl_version=<replaceable>TCL_VERSION</replaceable></option></term>
      <listitem>
       <para>
        Specifies the Tcl version to use when building PL/Tcl.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-icu-meson">
      <term><option>-Dicu={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with support for the
        <productname>ICU</productname><indexterm><primary>ICU</primary></indexterm>
        library, enabling use of ICU collation features (see <xref
        linkend="collation"/>).  Defaults to auto and requires the
        <productname>ICU4C</productname> package to be installed.  The minimum
        required version of <productname>ICU4C</productname> is currently 4.2.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-llvm-meson">
      <term><option>-Dllvm={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with support for <productname>LLVM</productname> based
        <acronym>JIT</acronym> compilation (see <xref linkend="jit"/>).
        This requires the <productname>LLVM</productname> library to be
        installed.  The minimum required version of
        <productname>LLVM</productname> is currently 10.  Disabled by
        default.
       </para>

       <para>
        <command>llvm-config</command><indexterm><primary>llvm-config</primary></indexterm>
        will be used to find the required compilation options.
        <command>llvm-config</command>, and then
        <command>llvm-config-$version</command> for all supported versions,
        will be searched for in your <envar>PATH</envar>.  If that would not
        yield the desired program, use <envar>LLVM_CONFIG</envar> to specify a
        path to the correct <command>llvm-config</command>.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-lz4-meson">
      <term><option>-Dlz4={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with <productname>LZ4</productname> compression support.
        Defaults to auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-zstd-meson">
      <term><option>-Dzstd={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with <productname>Zstandard</productname> compression support.
        Defaults to auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-ssl-meson">
      <term><option>-Dssl={ auto | <replaceable>LIBRARY</replaceable> }</option>
      <indexterm>
       <primary>OpenSSL</primary>
       <seealso>SSL</seealso>
      </indexterm>
      </term>
      <listitem>
       <para>
        Build with support for <acronym>SSL</acronym> (encrypted) connections.
        The only <replaceable>LIBRARY</replaceable> supported is
        <option>openssl</option>. This requires the
        <productname>OpenSSL</productname> package to be installed.  Building
        with this will check for the required header files and libraries to
        make sure that your <productname>OpenSSL</productname> installation is
        sufficient before proceeding.  The default for this option is auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-gssapi-meson">
      <term><option>-Dgssapi={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with support for GSSAPI authentication. MIT Kerberos is required
        to be installed for GSSAPI.  On many systems, the GSSAPI system (a part
        of the MIT Kerberos installation) is not installed in a location
        that is searched by default (e.g., <filename>/usr/include</filename>,
        <filename>/usr/lib</filename>).  In
        those cases, PostgreSQL will query <command>pkg-config</command> to
        detect the required compiler and linker options.  Defaults to auto.
        <filename>meson configure</filename> will check for the required
        header files and libraries to make sure that your GSSAPI installation
        is sufficient before proceeding.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-ldap-meson">
      <term><option>-Dldap={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with
        <acronym>LDAP</acronym><indexterm><primary>LDAP</primary></indexterm>
        support for authentication and connection parameter lookup (see
        <phrase id="install-ldap-links-meson"><xref linkend="libpq-ldap"/> and
        <xref linkend="auth-ldap"/></phrase> for more information).  On Unix,
        this requires the <productname>OpenLDAP</productname> package to be
        installed. On Windows, the default <productname>WinLDAP</productname>
        library is used.  Defaults to auto.  <filename>meson
        configure</filename> will check for the required header files and
        libraries to make sure that your <productname>OpenLDAP</productname>
        installation is sufficient before proceeding.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-pam-meson">
      <term><option>-Dpam={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with
        <acronym>PAM</acronym><indexterm><primary>PAM</primary></indexterm>
        (Pluggable Authentication Modules) support.  Defaults to auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-bsd-auth-meson">
      <term><option>-Dbsd_auth={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with BSD Authentication support.  (The BSD Authentication
        framework is currently only available on OpenBSD.)  Defaults to auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-systemd-meson">
      <term><option>-Dsystemd={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with support for
        <application>systemd</application><indexterm><primary>systemd</primary></indexterm>
        service notifications.  This improves integration if the server is
        started under <application>systemd</application> but has no impact
        otherwise; see <xref
        linkend="server-start"/> for more information.  Defaults to
        auto.  <application>libsystemd</application> and the associated header
        files need to be installed to use this option.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-bonjour-meson">
      <term><option>-Dbonjour={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with support for Bonjour automatic service discovery.  Defaults
        to auto and requires Bonjour support in your operating system.
        Recommended on macOS.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-uuid-meson">
      <term><option>-Duuid=<replaceable>LIBRARY</replaceable></option></term>
      <listitem>
       <para>
        Build the <xref linkend="uuid-ossp"/> module
        (which provides functions to generate UUIDs), using the specified
        UUID library.<indexterm><primary>UUID</primary></indexterm>
        <replaceable>LIBRARY</replaceable> must be one of:
       </para>
       <itemizedlist>
        <listitem>
         <para>
          <option>none</option> to not build the uuid module. This is the default.
         </para>
        </listitem>
        <listitem>
         <para>
          <option>bsd</option> to use the UUID functions found in FreeBSD,
          and some other BSD-derived systems
         </para>
        </listitem>
        <listitem>
         <para>
          <option>e2fs</option> to use the UUID library created by
          the <literal>e2fsprogs</literal> project; this library is present in most
          Linux systems and in macOS, and can be obtained for other
          platforms as well
         </para>
        </listitem>
        <listitem>
         <para>
          <option>ossp</option> to use the <ulink
          url="http://www.ossp.org/pkg/lib/uuid/">OSSP UUID library</ulink>
         </para>
        </listitem>
       </itemizedlist>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-libxml-meson">
      <term><option>-Dlibxml={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with libxml2, enabling SQL/XML support.  Defaults to
        auto. Libxml2 version 2.6.23 or later is required for this feature.
       </para>

       <para>
        To use a libxml2 installation that is in an unusual location, you
        can set <command>pkg-config</command>-related environment
        variables (see its documentation).
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-libxslt-meson">
      <term><option>-Dlibxslt={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with libxslt, enabling the
        <xref linkend="xml2"/>
        module to perform XSL transformations of XML.
        <option>-Dlibxml</option> must be specified as well.  Defaults to
        auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-with-sepgsql-meson">
      <term><option>-Dselinux={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Build with SElinux support, enabling the <xref linkend="sepgsql"/>
        extension.  Defaults to auto.
       </para>
      </listitem>
     </varlistentry>

    </variablelist>
   </sect3>

   <sect3 id="meson-options-anti-features">
    <title>Anti-Features</title>

    <variablelist>
     <varlistentry id="configure-readline-meson">
      <term><option>-Dreadline={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Allows use of the <application>Readline</application> library (and
        <application>libedit</application> as well).  This option defaults to
        auto and enables command-line editing and history in
        <application>psql</application> and is strongly recommended.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-libedit-preferred-meson">
      <term><option>-Dlibedit_preferred={ true | false }</option></term>
      <listitem>
       <para>
        Setting this to true favors the use of the BSD-licensed
        <application>libedit</application> library rather than GPL-licensed
        <application>Readline</application>.  This option is significant only
        if you have both libraries installed; the default is false, that is to
        use <application>Readline</application>.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-zlib-meson">
      <term><option>-Dzlib={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        <indexterm>
         <primary>zlib</primary>
        </indexterm>
        Enables use of the <application>Zlib</application> library.
        It defaults to auto and enables
        support for compressed archives in <application>pg_dump</application>,
        <application>pg_restore</application> and <application>pg_basebackup</application> and is recommended.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-spinlocks-meson">
      <term><option>-Dspinlocks={ true | false }</option></term>
      <listitem>
       <para>
        This option is set to true by default; setting it to false will
        allow the build to succeed even if <productname>PostgreSQL</productname>
        has no CPU spinlock support for the platform.  The lack of
        spinlock support will result in very poor performance; therefore,
        this option should only be changed if the build aborts and
        informs you that the platform lacks spinlock support. If setting this
        option to false is required to build <productname>PostgreSQL</productname> on
        your platform, please report the problem to the
        <productname>PostgreSQL</productname> developers.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-atomics-meson">
      <term><option>-Datomics={ true | false }</option></term>
      <listitem>
       <para>
        This option is set to true by default; setting it to false will
        disable use of CPU atomic operations.  The option does nothing on
        platforms that lack such operations.  On platforms that do have
        them, disabling atomics will result in poor performance.  Changing
        this option is only useful for debugging or making performance comparisons.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </sect3>

   <sect3 id="meson-options-build-process">
    <title>Build Process Details</title>

    <variablelist>
     <varlistentry id="configure-auto-features-meson">
      <term><option>--auto_features={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Setting this option allows you to override the value of all
        <quote>auto</quote> features (features that are enabled automatically
        if the required software is found).  This can be useful when you want
        to disable or enable all the <quote>optional</quote> features at once
        without having to set each of them manually. The default value for
        this parameter is auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-backend-meson">
      <term><option>--backend=<replaceable>BACKEND</replaceable></option></term>
      <listitem>
       <para>
        The default backend Meson uses is ninja and that should suffice for
        most use cases.  However, if you'd like to fully integrate with Visual
        Studio, you can set the <replaceable>BACKEND</replaceable> to
        <literal>vs</literal>.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-c-args-meson">
      <term><option>-Dc_args=<replaceable>OPTIONS</replaceable></option></term>
      <listitem>
       <para>
        This option can be used to pass extra options to the C compiler.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-c-link-args-meson">
      <term><option>-Dc_link_args=<replaceable>OPTIONS</replaceable></option></term>
      <listitem>
       <para>
        This option can be used to pass extra options to the C linker.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-extra-include-dirs-meson">
      <term><option>-Dextra_include_dirs=<replaceable>DIRECTORIES</replaceable></option></term>
      <listitem>
       <para>
        <replaceable>DIRECTORIES</replaceable> is a comma-separated list of
        directories that will be added to the list the compiler searches for
        header files. If you have optional packages (such as GNU
        <application>Readline</application>) installed in a non-standard
        location, you have to use this option and probably also the
        corresponding <option>-Dextra_lib_dirs</option> option.
       </para>

       <para>
        Example: <literal>-Dextra_include_dirs=/opt/gnu/include,/usr/sup/include</literal>.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-extra-lib-dirs-meson">
      <term><option>-Dextra_lib_dirs=<replaceable>DIRECTORIES</replaceable></option></term>
      <listitem>
       <para>
        <replaceable>DIRECTORIES</replaceable> is a comma-separated list of
        directories to search for libraries. You will probably have to use
        this option (and the corresponding
        <option>-Dextra_include_dirs</option> option) if you have packages
        installed in non-standard locations.
       </para>
       <para>
        Example: <literal>-Dextra_lib_dirs=/opt/gnu/lib,/usr/sup/lib</literal>.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-system-tzdata-meson">
      <term><option>-Dsystem_tzdata=<replaceable>DIRECTORY</replaceable></option>
      <indexterm>
       <primary>time zone data</primary>
      </indexterm>
      </term>
      <listitem>
       <para>
        <productname>PostgreSQL</productname> includes its own time zone
        database, which it requires for date and time operations.  This time
        zone database is in fact compatible with the IANA time zone database
        provided by many operating systems such as FreeBSD, Linux, and
        Solaris, so it would be redundant to install it again.  When this
        option is used, the system-supplied time zone database in
        <replaceable>DIRECTORY</replaceable> is used instead of the one
        included in the PostgreSQL source distribution.
        <replaceable>DIRECTORY</replaceable> must be specified as an absolute
        path.  <filename>/usr/share/zoneinfo</filename> is a likely directory
        on some operating systems.  Note that the installation routine will
        not detect mismatching or erroneous time zone data.  If you use this
        option, you are advised to run the regression tests to verify that the
        time zone data you have pointed to works correctly with
        <productname>PostgreSQL</productname>.
       </para>

       <indexterm><primary>cross compilation</primary></indexterm>

       <para>
        This option is mainly aimed at binary package distributors who know
        their target operating system well.  The main advantage of using this
        option is that the PostgreSQL package won't need to be upgraded
        whenever any of the many local daylight-saving time rules change.
        Another advantage is that PostgreSQL can be cross-compiled more
        straightforwardly if the time zone database files do not need to be
        built during the installation.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-extra-version-meson">
      <term><option>-Dextra_version=<replaceable>STRING</replaceable></option></term>
      <listitem>
       <para>
        Append <replaceable>STRING</replaceable> to the PostgreSQL version
        number.  You can use this, for example, to mark binaries built from
        unreleased <productname>Git</productname> snapshots or containing
        custom patches with an extra version string, such as a <command>git
        describe</command> identifier or a distribution package release
        number.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-rpath-meson">
      <term><option>-Drpath={ true | false }</option></term>
      <listitem>
       <para>
        This option is set to true by default.  If set to false,
        do not mark <productname>PostgreSQL</productname>'s executables
        to indicate that they should search for shared libraries in the
        installation's library directory (see <option>--libdir</option>).
        On most platforms, this marking uses an absolute path to the
        library directory, so that it will be unhelpful if you relocate
        the installation later.  However, you will then need to provide
        some other way for the executables to find the shared libraries.
        Typically this requires configuring the operating system's
        dynamic linker to search the library directory; see
        <xref linkend="install-post-shlibs"/> for more detail.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-binary-name-meson">
      <term><option>-D<replaceable>BINARY_NAME</replaceable>=<replaceable>PATH</replaceable></option></term>
      <listitem>
       <para>
        If a program required to build PostgreSQL (with or without optional
        flags) is stored at a non-standard path, you can specify it manually
        to <literal>meson configure</literal>.  The complete list of programs
        for which this is supported can be found by running <literal>meson
        configure</literal>.  Example:
<programlisting>meson configure -DBISON=PATH_TO_BISON</programlisting>
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </sect3>

   <sect3 id="meson-options-docs">
    <title>Documentation</title>

    <para>
     See <xref linkend="docguide-toolsets"/> for the tools needed for building
     the documentation.
    </para>

    <variablelist>

     <varlistentry id="configure-docs-meson">
      <term><option>-Ddocs={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Enables building the documentation in <acronym>HTML</acronym> and
        <acronym>man</acronym> format. It defaults to auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-docs-pdf-meson">
      <term><option>-Ddocs_pdf={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Enables building the documentation in <acronym>PDF</acronym>
        format. It defaults to auto.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-docs-html-style">
      <term><option>-Ddocs_html_style={ simple | website }</option></term>
      <listitem>
       <para>
        Controls which <acronym>CSS</acronym> stylesheet is used.  The default
        is <literal>simple</literal>.  If set to <literal>website</literal>,
        the HTML documentation will reference the stylesheet for <ulink
        url="https://www.postgresql.org/docs/current/">postgresql.org</ulink>.
       </para>
      </listitem>
     </varlistentry>

    </variablelist>
   </sect3>

   <sect3 id="meson-options-misc">
    <title>Miscellaneous</title>

    <variablelist>
     <varlistentry id="configure-pgport-meson">
      <term><option>-Dpgport=<replaceable>NUMBER</replaceable></option></term>
      <listitem>
       <para>
        Set <replaceable>NUMBER</replaceable> as the default port number for
        server and clients. The default is 5432. The port can always
        be changed later on, but if you specify it here then both
        server and clients will have the same default compiled in,
        which can be very convenient.  Usually the only good reason
        to select a non-default value is if you intend to run multiple
        <productname>PostgreSQL</productname> servers on the same machine.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-krb-srvnam-meson">
      <term><option>-Dkrb_srvnam=<replaceable>NAME</replaceable></option></term>
      <listitem>
       <para>
        The default name of the Kerberos service principal used
        by GSSAPI.
        <literal>postgres</literal> is the default. There's usually no
        reason to change this unless you are building for a Windows
        environment, in which case it must be set to upper case
        <literal>POSTGRES</literal>.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-segsize-meson">
      <term><option>-Dsegsize=<replaceable>SEGSIZE</replaceable></option></term>
      <listitem>
       <para>
        Set the <firstterm>segment size</firstterm>, in gigabytes.  Large tables are
        divided into multiple operating-system files, each of size equal
        to the segment size.  This avoids problems with file size limits
        that exist on many platforms.  The default segment size, 1 gigabyte,
        is safe on all supported platforms.  If your operating system has
        <quote>largefile</quote> support (which most do, nowadays), you can use
        a larger segment size.  This can be helpful to reduce the number of
        file descriptors consumed when working with very large tables.
        But be careful not to select a value larger than is supported
        by your platform and the file systems you intend to use.  Other
        tools you might wish to use, such as <application>tar</application>, could
        also set limits on the usable file size.
        It is recommended, though not absolutely required, that this value
        be a power of 2.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-blocksize-meson">
      <term><option>-Dblocksize=<replaceable>BLOCKSIZE</replaceable></option></term>
      <listitem>
       <para>
        Set the <firstterm>block size</firstterm>, in kilobytes.  This is the unit
        of storage and I/O within tables.  The default, 8 kilobytes,
        is suitable for most situations; but other values may be useful
        in special cases.
        The value must be a power of 2 between 1 and 32 (kilobytes).
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-wal-blocksize-meson">
      <term><option>-Dwal_blocksize=<replaceable>BLOCKSIZE</replaceable></option></term>
      <listitem>
       <para>
        Set the <firstterm>WAL block size</firstterm>, in kilobytes.  This is the unit
        of storage and I/O within the WAL log.  The default, 8 kilobytes,
        is suitable for most situations; but other values may be useful
        in special cases.
        The value must be a power of 2 between 1 and 64 (kilobytes).
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </sect3>

   <sect3 id="meson-options-devel">
    <title>Developer Options</title>

    <para>
     Most of the options in this section are only of interest for
     developing or debugging <productname>PostgreSQL</productname>.
     They are not recommended for production builds, except
     for <option>--debug</option>, which can be useful to enable
     detailed bug reports in the unlucky event that you encounter a bug.
     On platforms supporting DTrace, <option>-Ddtrace</option>
     may also be reasonable to use in production.
    </para>

    <para>
     When building an installation that will be used to develop code inside
     the server, it is recommended to use at least the <option>--buildtype=debug</option>
     and <option>-Dcassert</option> options.
    </para>

    <variablelist>
     <varlistentry id="configure-buildtype-meson">
      <term><option>--buildtype=<replaceable>BUILDTYPE</replaceable></option></term>
      <listitem>
       <para>
        This option can be used to specify the buildtype to use; defaults to
        <option>debugoptimized</option>.  If you'd like finer control on the debug
        symbols and optimization levels than what this option provides, you
        can refer to the <option>--debug</option> and
        <option>--optimization</option> flags.
       </para>

       <para>
        The following build types are generally used: <option>plain</option>,
        <option>debug</option>, <option>debugoptimized</option> and
        <option>release</option>.  More information about them can be found in
        the <ulink
        url="https://mesonbuild.com/Running-Meson.html#configuring-the-build-directory">Meson
        documentation</ulink>.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-debug-meson">
      <term><option>--debug</option></term>
      <listitem>
       <para>
        Compiles all programs and libraries with debugging symbols.  This
        means that you can run the programs in a debugger to analyze
        problems. This enlarges the size of the installed executables
        considerably, and on non-GCC compilers it usually also disables
        compiler optimization, causing slowdowns. However, having the symbols
        available is extremely helpful for dealing with any problems that
        might arise.  Currently, this option is recommended for production
        installations only if you use GCC.  But you should always have it on
        if you are doing development work or running a beta version.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-optimization-meson">
      <term><option>--optimization</option>=<replaceable>LEVEL</replaceable></term>
      <listitem>
       <para>
        Specify the optimization level. <option>LEVEL</option> can be set to any of {0,g,1,2,3,s}.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-werror-meson">
      <term><option>--werror</option></term>
      <listitem>
       <para>
        Setting this option asks the compiler to treat warnings as
        errors. This can be useful for code development.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-cassert-meson">
      <term><option>-Dcassert={ true | false }</option></term>
      <listitem>
       <para>
        Enables <firstterm>assertion</firstterm> checks in the server, which
        test for many <quote>cannot happen</quote> conditions.  This is
        invaluable for code development purposes, but the tests slow down the
        server significantly.  Also, having the tests turned on won't
        necessarily enhance the stability of your server!  The assertion
        checks are not categorized for severity, and so what might be a
        relatively harmless bug will still lead to server restarts if it
        triggers an assertion failure.  This option is not recommended for
        production use, but you should have it on for development work or when
        running a beta version.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-tap-tests-meson">
      <term><option>-Dtap_tests={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        Enable tests using the Perl TAP tools.  Defaults to auto and requires
        a Perl installation and the Perl module <literal>IPC::Run</literal>.
        See <xref linkend="regress-tap"/> for more information.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-pg-test-extra-meson">
      <term><option>-DPG_TEST_EXTRA=<replaceable>TEST_SUITES</replaceable></option></term>
      <listitem>
       <para>
        Enable test suites which require special software to run.  This option
        accepts arguments via a whitespace-separated list.  See <xref
        linkend="regress-additional"/> for details.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-b-coverage-meson">
      <term><option>-Db_coverage={ true | false }</option></term>
      <listitem>
       <para>
        If using GCC, all programs and libraries are compiled with
        code coverage testing instrumentation.  When run, they
        generate files in the build directory with code coverage
        metrics.
        See <xref linkend="regress-coverage"/>
        for more information. This option is for use only with GCC
        and when doing development work.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-dtrace-meson">
      <term><option>-Ddtrace={ auto | enabled | disabled }</option></term>
      <listitem>
       <para>
        <indexterm>
         <primary>DTrace</primary>
        </indexterm>
        Enabling this compiles <productname>PostgreSQL</productname> with support for the
        dynamic tracing tool DTrace.
        See <xref linkend="dynamic-trace"/> for more information.
       </para>

       <para>
        To point to the <command>dtrace</command> program, the
        <option>DTRACE</option> option can be set.  This
        will often be necessary because <command>dtrace</command> is
        typically installed under <filename>/usr/sbin</filename>,
        which might not be in your <envar>PATH</envar>.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="configure-injection-points-meson">
      <term><option>-Dinjection_points={ true | false }</option></term>
      <listitem>
       <para>
        Compiles <productname>PostgreSQL</productname> with support for
        injection points in the server. Injection points allow to run
        user-defined code from within the server in pre-defined code paths.
        This helps in testing and in the investigation of concurrency scenarios
        in a controlled fashion. This option is disabled by default.  See
        <xref linkend="xfunc-addin-injection-points"/> for more details.  This
        option is intended to be used only by developers for testing.
       </para>
      </listitem>
     </varlistentry>

      <varlistentry id="configure-segsize-blocks-meson">
       <term><option>-Dsegsize_blocks=SEGSIZE_BLOCKS</option></term>
       <listitem>
        <para>
         Specify the relation segment size in blocks. If both
         <option>-Dsegsize</option> and this option are specified, this option
         wins.

         This option is only for developers, to test segment related code.
        </para>
       </listitem>
      </varlistentry>

    </variablelist>
   </sect3>
  </sect2>

  <sect2 id="targets-meson">
   <title><literal>meson</literal> Build Targets</title>

   <para>
    Individual build targets can be built using <command>ninja</command> <replaceable>target</replaceable>.

    When no target is specified, everything except documentation is
    built. Individual build products can be built using the path/filename as
    <replaceable>target</replaceable>.
   </para>

   &targets-meson;
  </sect2>

 </sect1>

 <sect1 id="install-post">
  <title>Post-Installation Setup</title>

  <sect2 id="install-post-shlibs">
   <title>Shared Libraries</title>

   <indexterm>
    <primary>shared library</primary>
   </indexterm>

   <para>
    On some systems with shared libraries
    you need to tell the system how to find the newly installed
    shared libraries.  The systems on which this is
    <emphasis>not</emphasis> necessary include
    <systemitem class="osname">FreeBSD</systemitem>,
    <systemitem class="osname">Linux</systemitem>,
    <systemitem class="osname">NetBSD</systemitem>, <systemitem
    class="osname">OpenBSD</systemitem>, and
    <systemitem class="osname">Solaris</systemitem>.
   </para>

   <para>
    The method to set the shared library search path varies between
    platforms, but the most widely-used method is to set the
    environment variable <envar>LD_LIBRARY_PATH</envar> like so: In Bourne
    shells (<command>sh</command>, <command>ksh</command>, <command>bash</command>, <command>zsh</command>):
<programlisting>
LD_LIBRARY_PATH=/usr/local/pgsql/lib
export LD_LIBRARY_PATH
</programlisting>
    or in <command>csh</command> or <command>tcsh</command>:
<programlisting>
setenv LD_LIBRARY_PATH /usr/local/pgsql/lib
</programlisting>
    Replace <literal>/usr/local/pgsql/lib</literal> with whatever you set
    <option><literal>--libdir</literal></option> to in <xref linkend="configure"/>.
    You should put these commands into a shell start-up file such as
    <filename>/etc/profile</filename> or <filename>~/.bash_profile</filename>.  Some
    good information about the caveats associated with this method can
    be found at <ulink
    url="http://xahlee.info/UnixResource_dir/_/ldpath.html"></ulink>.
   </para>

   <para>
    On some systems it might be preferable to set the environment
    variable <envar>LD_RUN_PATH</envar> <emphasis>before</emphasis>
    building.
   </para>

   <para>
    On <systemitem class="osname">Cygwin</systemitem>, put the library
    directory in the <envar>PATH</envar> or move the
    <filename>.dll</filename> files into the <filename>bin</filename>
    directory.
   </para>

   <para>
    If in doubt, refer to the manual pages of your system (perhaps
    <command>ld.so</command> or <command>rld</command>). If you later
    get a message like:
<screen>
psql: error in loading shared libraries
libpq.so.2.1: cannot open shared object file: No such file or directory
</screen>
    then this step was necessary.  Simply take care of it then.
   </para>

   <para>
    <indexterm>
     <primary>ldconfig</primary>
    </indexterm>
    If you are on <systemitem class="osname">Linux</systemitem> and you have root
    access, you can run:
<programlisting>
/sbin/ldconfig /usr/local/pgsql/lib
</programlisting>
    (or equivalent directory) after installation to enable the
    run-time linker to find the shared libraries faster.  Refer to the
    manual page of <command>ldconfig</command> for more information.  On
    <systemitem class="osname">FreeBSD</systemitem>, <systemitem
    class="osname">NetBSD</systemitem>, and <systemitem
    class="osname">OpenBSD</systemitem> the command is:
<programlisting>
/sbin/ldconfig -m /usr/local/pgsql/lib
</programlisting>
    instead.  Other systems are not known to have an equivalent
    command.
   </para>
  </sect2>

  <sect2 id="install-post-env-vars">
   <title>Environment Variables</title>

   <indexterm>
    <primary><envar>PATH</envar></primary>
   </indexterm>

   <para>
    If you installed into <filename>/usr/local/pgsql</filename> or some other
    location that is not searched for programs by default, you should
    add <filename>/usr/local/pgsql/bin</filename> (or whatever you set
    <option><literal>--bindir</literal></option> to in <xref linkend="configure"/>)
    into your <envar>PATH</envar>.  Strictly speaking, this is not
    necessary, but it will make the use of <productname>PostgreSQL</productname>
    much more convenient.
   </para>

   <para>
    To do this, add the following to your shell start-up file, such as
    <filename>~/.bash_profile</filename> (or <filename>/etc/profile</filename>, if you
    want it to affect all users):
<programlisting>
PATH=/usr/local/pgsql/bin:$PATH
export PATH
</programlisting>
    If you are using <command>csh</command> or <command>tcsh</command>, then use this command:
<programlisting>
set path = ( /usr/local/pgsql/bin $path )
</programlisting>
   </para>

   <para>
    <indexterm>
     <primary><envar>MANPATH</envar></primary>
    </indexterm>
    To enable your system to find the <application>man</application>
    documentation, you need to add lines like the following to a
    shell start-up file unless you installed into a location that is
    searched by default:
<programlisting>
MANPATH=/usr/local/pgsql/share/man:$MANPATH
export MANPATH
</programlisting>
   </para>

   <para>
    The environment variables <envar>PGHOST</envar> and <envar>PGPORT</envar>
    specify to client applications the host and port of the database
    server, overriding the compiled-in defaults. If you are going to
    run client applications remotely then it is convenient if every
    user that plans to use the database sets <envar>PGHOST</envar>.  This
    is not required, however; the settings can be communicated via command
    line options to most client programs.
   </para>
  </sect2>
 </sect1>

 <sect1 id="supported-platforms">
  <title>Supported Platforms</title>

  <para>
   A platform (that is, a CPU architecture and operating system combination)
   is considered supported by the <productname>PostgreSQL</productname> development
   community if the code contains provisions to work on that platform and
   it has recently been verified to build and pass its regression tests
   on that platform.  Currently, most testing of platform compatibility
   is done automatically by test machines in the
   <ulink url="https://buildfarm.postgresql.org/">PostgreSQL Build Farm</ulink>.
   If you are interested in using <productname>PostgreSQL</productname> on a platform
   that is not represented in the build farm, but on which the code works
   or can be made to work, you are strongly encouraged to set up a build
   farm member machine so that continued compatibility can be assured.
  </para>

  <para>
   In general, <productname>PostgreSQL</productname> can be expected to work on
   these CPU architectures: x86, PowerPC, S/390, SPARC, ARM, MIPS, RISC-V,
   and PA-RISC, including
   big-endian, little-endian, 32-bit, and 64-bit variants where applicable.
   It is often
   possible to build on an unsupported CPU type by configuring with
   <option>--disable-spinlocks</option>, but performance will be poor.
  </para>

  <para>
   <productname>PostgreSQL</productname> can be expected to work on current
   versions of these operating systems: Linux, Windows,
   FreeBSD, OpenBSD, NetBSD, DragonFlyBSD, macOS, Solaris, and illumos.
   Other Unix-like systems may also work but are not currently
   being tested.  In most cases, all CPU architectures supported by
   a given operating system will work.  Look in
   <xref linkend="installation-platform-notes"/> below to see if
   there is information
   specific to your operating system, particularly if using an older system.
  </para>

  <para>
   If you have installation problems on a platform that is known
   to be supported according to recent build farm results, please report
   it to <email>pgsql-bugs@lists.postgresql.org</email>.  If you are interested
   in porting <productname>PostgreSQL</productname> to a new platform,
   <email>pgsql-hackers@lists.postgresql.org</email> is the appropriate place
   to discuss that.
  </para>

  <para>
   Historical versions of <productname>PostgreSQL</productname> or POSTGRES
   also ran on CPU architectures including Alpha, Itanium, M32R, M68K,
   M88K, NS32K, SuperH, and VAX, and operating systems including 4.3BSD, AIX, BEOS,
   BSD/OS, DG/UX, Dynix, HP-UX, IRIX, NeXTSTEP, QNX, SCO, SINIX, Sprite, SunOS,
   Tru64 UNIX, and ULTRIX.
  </para>
 </sect1>

 <sect1 id="installation-platform-notes">
  <title>Platform-Specific Notes</title>

  <para>
   This section documents additional platform-specific issues
   regarding the installation and setup of PostgreSQL.  Be sure to
   read the installation instructions, and in
   particular <xref linkend="install-requirements"/> as well.  Also,
   check <xref linkend="regress"/> regarding the
   interpretation of regression test results.
  </para>

  <para>
   Platforms that are not covered here have no known platform-specific
   installation issues.
  </para>

  <sect2 id="installation-notes-cygwin">
   <title>Cygwin</title>

   <indexterm zone="installation-notes-cygwin">
    <primary>Cygwin</primary>
    <secondary>installation on</secondary>
   </indexterm>

   <para>
    PostgreSQL can be built using Cygwin, a Linux-like environment for
    Windows, but that method is inferior to the native Windows build
    and running a server under Cygwin is no longer recommended.
   </para>

   <para>
    When building from source, proceed according to the Unix-style
    installation procedure (i.e., <literal>./configure;
    make</literal>; etc.), noting the following Cygwin-specific
    differences:

    <itemizedlist>
     <listitem>
      <para>
       Set your path to use the Cygwin bin directory before the
       Windows utilities.  This will help prevent problems with
       compilation.
      </para>
     </listitem>

     <listitem>
      <para>
       The <command>adduser</command> command is not supported; use
       the appropriate user management application on Windows.
       Otherwise, skip this step.
      </para>
     </listitem>

     <listitem>
      <para>
       The <command>su</command> command is not supported; use ssh to
       simulate su on Windows. Otherwise, skip this step.
      </para>
     </listitem>

     <listitem>
      <para>
       <productname>OpenSSL</productname> is not supported.
      </para>
     </listitem>

     <listitem>
      <para>
       Start <command>cygserver</command> for shared memory support.
       To do this, enter the command <literal>/usr/sbin/cygserver
       &amp;</literal>.  This program needs to be running anytime you
       start the PostgreSQL server or initialize a database cluster
       (<command>initdb</command>).  The
       default <command>cygserver</command> configuration may need to
       be changed (e.g., increase <symbol>SEMMNS</symbol>) to prevent
       PostgreSQL from failing due to a lack of system resources.
      </para>
     </listitem>

     <listitem>
      <para>
        Building might fail on some systems where a locale other than
        C is in use. To fix this, set the locale to C by doing
        <command>export LANG=C.utf8</command> before building, and then
        setting it back to the previous setting after you have installed
        PostgreSQL.
      </para>
     </listitem>

     <listitem>
      <para>
       The parallel regression tests (<literal>make check</literal>)
       can generate spurious regression test failures due to
       overflowing the <function>listen()</function> backlog queue
       which causes connection refused errors or hangs.  You can limit
       the number of connections using the make
       variable <varname>MAX_CONNECTIONS</varname> thus:
<programlisting>
make MAX_CONNECTIONS=5 check
</programlisting>
       (On some systems you can have up to about 10 simultaneous
       connections.)
      </para>
     </listitem>
    </itemizedlist>
   </para>

   <para>
    It is possible to install <command>cygserver</command> and the
    PostgreSQL server as Windows NT services.  For information on how
    to do this, please refer to the <filename>README</filename>
    document included with the PostgreSQL binary package on Cygwin.
    It is installed in the
    directory <filename>/usr/share/doc/Cygwin</filename>.
   </para>
  </sect2>

  <sect2 id="installation-notes-macos">
   <title>macOS</title>

   <indexterm zone="installation-notes-macos">
    <primary>macOS</primary>
    <secondary>installation on</secondary>
   </indexterm>

   <para>
    To build <productname>PostgreSQL</productname> from source
    on <productname>macOS</productname>, you will need to install Apple's
    command line developer tools, which can be done by issuing
<programlisting>
xcode-select --install
</programlisting>
    (note that this will pop up a GUI dialog window for confirmation).
    You may or may not wish to also install Xcode.
   </para>

   <para>
    On recent <productname>macOS</productname> releases, it's necessary to
    embed the <quote>sysroot</quote> path in the include switches used to
    find some system header files.  This results in the outputs of
    the <application>configure</application> script varying depending on
    which SDK version was used during <application>configure</application>.
    That shouldn't pose any problem in simple scenarios, but if you are
    trying to do something like building an extension on a different machine
    than the server code was built on, you may need to force use of a
    different sysroot path.  To do that, set <varname>PG_SYSROOT</varname>,
    for example
<programlisting>
make PG_SYSROOT=<replaceable>/desired/path</replaceable> all
</programlisting>
    To find out the appropriate path on your machine, run
<programlisting>
xcrun --show-sdk-path
</programlisting>
    Note that building an extension using a different sysroot version than
    was used to build the core server is not really recommended; in the
    worst case it could result in hard-to-debug ABI inconsistencies.
   </para>

   <para>
    You can also select a non-default sysroot path when configuring, by
    specifying <varname>PG_SYSROOT</varname>
    to <application>configure</application>:
<programlisting>
./configure ... PG_SYSROOT=<replaceable>/desired/path</replaceable>
</programlisting>
    This would primarily be useful to cross-compile for some other
    macOS version.  There is no guarantee that the resulting executables
    will run on the current host.
   </para>

   <para>
    To suppress the <option>-isysroot</option> options altogether, use
<programlisting>
./configure ... PG_SYSROOT=none
</programlisting>
    (any nonexistent pathname will work).  This might be useful if you wish
    to build with a non-Apple compiler, but beware that that case is not
    tested or supported by the PostgreSQL developers.
   </para>

   <para>
    <productname>macOS</productname>'s <quote>System Integrity
    Protection</quote> (SIP) feature breaks <literal>make check</literal>,
    because it prevents passing the needed setting
    of <literal>DYLD_LIBRARY_PATH</literal> down to the executables being
    tested.  You can work around that by doing <literal>make
    install</literal> before <literal>make check</literal>.
    Most PostgreSQL developers just turn off SIP, though.
   </para>
  </sect2>

  <sect2 id="installation-notes-mingw">
   <title>MinGW</title>

   <indexterm zone="installation-notes-mingw">
    <primary>MinGW</primary>
    <secondary>installation on</secondary>
   </indexterm>

   <para>
    PostgreSQL for Windows can be built using MinGW, a Unix-like build
    environment for Microsoft operating systems.
    The MinGW build procedure uses the normal build system described in
    this chapter.
   </para>

   <para>
    MinGW, the Unix-like build tools, and MSYS, a collection
    of Unix tools required to run shell scripts
    like <command>configure</command>, can be downloaded
    from <ulink url="http://www.mingw.org/"></ulink>.  Neither is
    required to run the resulting binaries; they are needed only for
    creating the binaries.
   </para>

   <para>
     To build 64 bit binaries using MinGW, install the 64 bit tool set
     from <ulink url="https://mingw-w64.org/"></ulink>, put its bin
     directory in the <envar>PATH</envar>, and run
     <command>configure</command> with the
     <command>--host=x86_64-w64-mingw32</command> option.
   </para>

   <para>
    After you have everything installed, it is suggested that you
    run <application>psql</application>
    under <command>CMD.EXE</command>, as the MSYS console has
    buffering issues.
   </para>

   <sect3 id="mingw-crash-dumps">
    <title>Collecting Crash Dumps</title>

    <para>
     If PostgreSQL on Windows crashes, it has the ability to generate
     <productname>minidumps</productname> that can be used to track down the cause
     for the crash, similar to core dumps on Unix. These dumps can be
     read using the <productname>Windows Debugger Tools</productname> or using
     <productname>Visual Studio</productname>. To enable the generation of dumps
     on Windows, create a subdirectory named <filename>crashdumps</filename>
     inside the cluster data directory. The dumps will then be written
     into this directory with a unique name based on the identifier of
     the crashing process and the current time of the crash.
    </para>
   </sect3>
  </sect2>

  <sect2 id="installation-notes-solaris">
   <title>Solaris</title>

   <indexterm zone="installation-notes-solaris">
    <primary>Solaris</primary>
    <secondary>installation on</secondary>
   </indexterm>

   <para>
    PostgreSQL is well-supported on Solaris.  The more up to date your
    operating system, the fewer issues you will experience.
   </para>

   <sect3 id="installation-notes-solaris-req-tools">
    <title>Required Tools</title>

    <para>
     You can build with either GCC or Sun's compiler suite.  For
     better code optimization, Sun's compiler is strongly recommended
     on the SPARC architecture.  If
     you are using Sun's compiler, be careful not to select
     <filename>/usr/ucb/cc</filename>;
     use <filename>/opt/SUNWspro/bin/cc</filename>.
    </para>

    <para>
     You can download Sun Studio
     from <ulink url="https://www.oracle.com/technetwork/server-storage/solarisstudio/downloads/"></ulink>.
     Many GNU tools are integrated into Solaris 10, or they are
     present on the Solaris companion CD.  If you need packages for
     older versions of Solaris, you can find these tools
     at <ulink url="http://www.sunfreeware.com"></ulink>.
     If you prefer
     sources, look
     at <ulink url="https://www.gnu.org/prep/ftp"></ulink>.
    </para>
   </sect3>

   <sect3 id="installation-notes-solaris-configure-complains">
    <title>configure Complains About a Failed Test Program</title>

    <para>
     If <command>configure</command> complains about a failed test
     program, this is probably a case of the run-time linker being
     unable to find some library, probably libz, libreadline or some
     other non-standard library such as libssl.  To point it to the
     right location, set the <envar>LDFLAGS</envar> environment
     variable on the <command>configure</command> command line, e.g.,
<programlisting>
configure ... LDFLAGS="-R /usr/sfw/lib:/opt/sfw/lib:/usr/local/lib"
</programlisting>
     See
     the <citerefentry><refentrytitle>ld</refentrytitle><manvolnum>1</manvolnum></citerefentry>
     man page for more information.
    </para>
   </sect3>

   <sect3 id="installation-notes-solaris-comp-opt-perf">
    <title>Compiling for Optimal Performance</title>

    <para>
     On the SPARC architecture, Sun Studio is strongly recommended for
     compilation.  Try using the <option>-xO5</option> optimization
     flag to generate significantly faster binaries.  Do not use any
     flags that modify behavior of floating-point operations
     and <varname>errno</varname> processing (e.g.,
     <option>-fast</option>).
    </para>

    <para>
     If you do not have a reason to use 64-bit binaries on SPARC,
     prefer the 32-bit version.  The 64-bit operations are slower and
     64-bit binaries are slower than the 32-bit variants.  On the
     other hand, 32-bit code on the AMD64 CPU family is not native,
     so 32-bit code is significantly slower on that CPU family.
    </para>
   </sect3>

   <sect3 id="installation-notes-solaris-using-dtrace">
    <title>Using DTrace for Tracing PostgreSQL</title>

    <para>
     Yes, using DTrace is possible.  See <xref linkend="dynamic-trace"/> for
     further information.
    </para>

    <para>
     If you see the linking of the <command>postgres</command> executable abort with an
     error message like:
<screen>
Undefined                       first referenced
 symbol                             in file
AbortTransaction                    utils/probes.o
CommitTransaction                   utils/probes.o
ld: fatal: Symbol referencing errors. No output written to postgres
collect2: ld returned 1 exit status
make: *** [postgres] Error 1
</screen>
     your DTrace installation is too old to handle probes in static
     functions.  You need Solaris 10u4 or newer to use DTrace.
    </para>
   </sect3>
  </sect2>

  <sect2 id="installation-notes-visual">
   <title>Visual</title>

   <indexterm zone="installation-notes-visual">
    <primary>Visual</primary>
    <secondary>installation on</secondary>
   </indexterm>

   <para>
    It is recommended that most users download the binary distribution for
    Windows, available as a graphical installer package from the
    <productname>PostgreSQL</productname> website at
    <ulink url="https://www.postgresql.org/download/"></ulink>. Building from
    source is only intended for people developing
    <productname>PostgreSQL</productname> or extensions.
   </para>

   <para>
    PostgreSQL for Windows with Visual can be built using meson, as described
    in <xref linkend="install-meson"/>.
    The native Windows port requires a 32 or 64-bit version of Windows
    10 or later.
   </para>

   <para>
    Native builds of <application>psql</application> don't support command
    line editing. The <productname>Cygwin</productname> build does support
    command line editing, so it should be used where psql is needed for
    interactive use on <productname>Windows</productname>.
   </para>

   <para>
    PostgreSQL can be built using the Visual C++ compiler suite from Microsoft.
    These compilers can be either from <productname>Visual Studio</productname>,
    <productname>Visual Studio Express</productname> or some versions of the
    <productname>Microsoft Windows SDK</productname>. If you do not already have a
    <productname>Visual Studio</productname> environment set up, the easiest
    ways are to use the compilers from
    <productname>Visual Studio 2022</productname> or those in the
    <productname>Windows SDK 10</productname>, which are both free downloads
    from Microsoft.
   </para>

   <para>
    Both 32-bit and 64-bit builds are possible with the Microsoft Compiler suite.
    32-bit PostgreSQL builds are possible with
    <productname>Visual Studio 2015</productname> to
    <productname>Visual Studio 2022</productname>,
    as well as standalone Windows SDK releases 10 and above.
    64-bit PostgreSQL builds are supported with
    <productname>Microsoft Windows SDK</productname> version 10 and above or
    <productname>Visual Studio 2015</productname> and above.
    <!--
        For 2015 requirements:
        https://docs.microsoft.com/en-us/visualstudio/productinfo/vs2015-sysrequirements-vs
        For 2017 requirements:
        https://docs.microsoft.com/en-us/visualstudio/productinfo/vs2017-system-requirements-vs
        For 2019 requirements:
        https://docs.microsoft.com/en-us/visualstudio/releases/2019/system-requirements
        For 2022 requirements:
        https://docs.microsoft.com/en-us/visualstudio/releases/2022/system-requirements
    -->
   </para>

   <para>
    If your build environment doesn't ship with a supported version of the
    <productname>Microsoft Windows SDK</productname> it is recommended
    that you upgrade to the latest version (currently version 10), available
    for download from <ulink url="https://www.microsoft.com/download"></ulink>.
   </para>

   <para>
    You must always include the
    <application>Windows Headers and Libraries</application> part of the SDK.
    If you install a <productname>Windows SDK</productname>
    including the <application>Visual C++ Compilers</application>,
    you don't need <productname>Visual Studio</productname> to build.
    Note that as of Version 8.0a the Windows SDK no longer ships with a
    complete command-line build environment.
   </para>

   <sect3 id="windows-requirements">
    <title>Requirements</title>
    <para>
     The following additional products are required to build
     <productname>PostgreSQL</productname> on Windows.

     <variablelist>
      <varlistentry>
       <term><productname>ActiveState Perl</productname></term>
       <listitem><para>
        ActiveState Perl is required to run the build generation scripts. MinGW
        or Cygwin Perl will not work. It must also be present in the PATH.
        Binaries can be downloaded from
        <ulink url="https://www.activestate.com"></ulink>
        (Note: version 5.14 or later is required,
        the free Standard Distribution is sufficient).
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>Bison</productname> and
        <productname>Flex</productname></term>
       <listitem>
       <para>
        <productname>Bison</productname> and <productname>Flex</productname> are
        required.  Only <productname>Bison</productname> versions 2.3 and later
        will work. <productname>Flex</productname> must be version 2.5.35 or later.
       </para>

       <para>
        Both <productname>Bison</productname> and <productname>Flex</productname>
        are included in the <productname>msys</productname> tool suite, available
        from <ulink url="http://www.mingw.org/wiki/MSYS"></ulink> as part of the
        <productname>MinGW</productname> compiler suite.
       </para>

       <para>
        You will need to add the directory containing
        <filename>flex.exe</filename> and <filename>bison.exe</filename> to the
        PATH environment variable. In the case of MinGW, the directory is the
        <filename>\msys\1.0\bin</filename> subdirectory of your MinGW
        installation directory.
       </para>

       <note>
        <para>
          The Bison distribution from GnuWin32 appears to have a bug that
          causes Bison to malfunction when installed in a directory with
          spaces in the name, such as the default location on English
          installations <filename>C:\Program Files\GnuWin32</filename>.
          Consider installing into <filename>C:\GnuWin32</filename> or use the
          NTFS short name path to GnuWin32 in your PATH environment setting
          (e.g., <filename>C:\PROGRA~1\GnuWin32</filename>).
         </para>
       </note>

       </listitem>
      </varlistentry>
     </variablelist>
    </para>

    <para>
     The following additional products are not required to get started,
     but are required to build the complete package.

     <variablelist>
      <varlistentry>
       <term><productname>ActiveState Tcl</productname></term>
       <listitem><para>
        Required for building <application>PL/Tcl</application> (Note: version
        8.4 is required, the free Standard Distribution is sufficient).
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>Diff</productname></term>
       <listitem><para>
        Diff is required to run the regression tests, and can be downloaded
        from <ulink url="http://gnuwin32.sourceforge.net"></ulink>.
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>Gettext</productname></term>
       <listitem><para>
        Gettext is required to build with NLS support, and can be downloaded
        from <ulink url="http://gnuwin32.sourceforge.net"></ulink>. Note that binaries,
        dependencies and developer files are all needed.
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>MIT Kerberos</productname></term>
       <listitem><para>
        Required for GSSAPI authentication support. MIT Kerberos can be
        downloaded from
        <ulink url="https://web.mit.edu/Kerberos/dist/index.html"></ulink>.
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>libxml2</productname> and
        <productname>libxslt</productname></term>
       <listitem><para>
        Required for XML support. Binaries can be downloaded from
        <ulink url="https://zlatkovic.com/pub/libxml"></ulink> or source from
        <ulink url="http://xmlsoft.org"></ulink>. Note that libxml2 requires iconv,
        which is available from the same download location.
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>LZ4</productname></term>
       <listitem><para>
        Required for supporting <productname>LZ4</productname> compression.
        Binaries and source can be downloaded from
        <ulink url="https://github.com/lz4/lz4/releases"></ulink>.
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>Zstandard</productname></term>
       <listitem><para>
        Required for supporting <productname>Zstandard</productname> compression.
        Binaries and source can be downloaded from
        <ulink url="https://github.com/facebook/zstd/releases"></ulink>.
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>OpenSSL</productname></term>
       <listitem><para>
        Required for SSL support. Binaries can be downloaded from
        <ulink url="https://slproweb.com/products/Win32OpenSSL.html"></ulink>
        or source from <ulink url="https://www.openssl.org"></ulink>.
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>ossp-uuid</productname></term>
       <listitem><para>
        Required for UUID-OSSP support (contrib only). Source can be
        downloaded from
        <ulink url="http://www.ossp.org/pkg/lib/uuid/"></ulink>.
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>Python</productname></term>
       <listitem><para>
        Required for building <application>PL/Python</application>. Binaries can
        be downloaded from <ulink url="https://www.python.org"></ulink>.
       </para></listitem>
      </varlistentry>

      <varlistentry>
       <term><productname>zlib</productname></term>
       <listitem><para>
        Required for compression support in <application>pg_dump</application>
        and <application>pg_restore</application>. Binaries can be downloaded
        from <ulink url="https://www.zlib.net"></ulink>.
       </para></listitem>
      </varlistentry>

     </variablelist>
    </para>
   </sect3>

   <sect3 id="install-windows-full-64-bit">
    <title>Special Considerations for 64-Bit Windows</title>
    <para>
     PostgreSQL will only build for the x64 architecture on 64-bit Windows.
    </para>
    <para>
     Mixing 32- and 64-bit versions in the same build tree is not supported.
     The build system will automatically detect if it's running in a 32- or
     64-bit environment, and build PostgreSQL accordingly. For this reason, it
     is important to start the correct command prompt before building.
    </para>
    <para>
     To use a server-side third party library such as <productname>Python</productname> or
     <productname>OpenSSL</productname>, this library <emphasis>must</emphasis> also be
     64-bit. There is no support for loading a 32-bit library in a 64-bit
     server. Several of the third party libraries that PostgreSQL supports may
     only be available in 32-bit versions, in which case they cannot be used with
     64-bit PostgreSQL.
    </para>
   </sect3>

   <sect3 id="windows-crash-dumps">
    <title>Collecting Crash Dumps</title>

    <para>
     If PostgreSQL on Windows crashes, it has the ability to generate
     <productname>minidumps</productname> that can be used to track down the cause
     for the crash, similar to core dumps on Unix. These dumps can be
     read using the <productname>Windows Debugger Tools</productname> or using
     <productname>Visual Studio</productname>. To enable the generation of dumps
     on Windows, create a subdirectory named <filename>crashdumps</filename>
     inside the cluster data directory. The dumps will then be written
     into this directory with a unique name based on the identifier of
     the crashing process and the current time of the crash.
    </para>
   </sect3>
  </sect2>
 </sect1>

</chapter>
