diff --color -ur zlib-1.3.1/configure zlib-1.3.1.new/configure
--- zlib-1.3.1/configure	2024-01-21 02:29:31.000000000 +0000
+++ zlib-1.3.1.new/configure	2024-02-17 19:37:10.614600000 +0000
@@ -265,14 +265,16 @@
         SHAREDLIBV=libz.$VER$shared_ext
         SHAREDLIBM=libz.$VER1$shared_ext
         LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}
+        if test -z ${AR}; then
         if "${CROSS_PREFIX}libtool" -V 2>&1 | grep Apple > /dev/null; then
             AR="${CROSS_PREFIX}libtool"
         elif libtool -V 2>&1 | grep Apple > /dev/null; then
             AR="libtool"
         else
             AR="/usr/bin/libtool"
         fi
-        ARFLAGS="-o" ;;
+        ARFLAGS="-o"
+        fi ;;
   *)
         LDSHARED=${LDSHARED-"$cc -shared"} ;;
   esac