From 5dc7681ff1f78536386fb4fc7bd0edc7a83c9406 Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Fri, 18 Aug 2023 16:01:06 -0700
Subject: [PATCH] Fix version numbering for Darwin shared library.

---
 configure | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index cc867c9..1a7e897 100755
--- a/configure
+++ b/configure
@@ -44,7 +44,8 @@ STATICLIB=libz.a
 
 # extract zlib version numbers from zlib.h
 VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < ${SRCDIR}zlib.h`
-VER1=`sed -n -e '/VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`
+VERN=`echo ${VER}|sed -n -e 's/\([0-9]\{1,\}\(\\.[0-9]\{1,\}\)\{1,\}\).*/\1/p'`
+VER1=`echo ${VER}|sed -n -e 's/\([0-9]\{1,\}\)\\..*/\1/p'`
 
 # establish commands for library building
 if "${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then
@@ -263,7 +264,7 @@ if test "$gcc" -eq 1 && ($cc -c $test.c) >> configure.log 2>&1; then
         SHAREDLIB=libz$shared_ext
         SHAREDLIBV=libz.$VER$shared_ext
         SHAREDLIBM=libz.$VER1$shared_ext
-        LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER"}
+        LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VERN"}
         if "${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