tce-load -i compiletc intltool gtksourceview-dev libpeas-dev gsettings-desktop-schemas-dev itstool vala-dev libsoup-gnome-dev gspell-dev iso-codes gtksourceview-gir

wget https://ftp.gnome.org/pub/GNOME/sources/gedit/3.28/gedit-3.28.1.tar.xz

cd gedit-3.28.1

CC="gcc -flto -march=i486 -mtune=i686 -Os -pipe -Wno-incompatible-pointer-types" CXX="g++ -flto -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --disable-static --localstatedir=/var --libexecdir=/usr/local/lib/gedit --disable-spell --disable-gtk-doc-html

find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make [2m 7.85s]
sudo make install

Configuration:

        Source code location:   .
        Compiler:               gcc -flto -march=i486 -mtune=i686 -Os -pipe
        Spell Plugin enabled:   yes
        Gvfs metadata enabled:  yes
        Deprecations enabled:   
        GObject Introspection:  yes
        GDK Backend:            x11
        Python support:         no
        Vala support:           yes