From 95ded2c5691866d2ea86f673648777a677a30093 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sun, 21 Aug 2016 23:34:48 +0200
Subject: configure: make it work without PKG_CHECK_MODULES
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With commit c2f9b78 we added a new dependency on pkg-config for
developers which may be unwanted. This change make the configure script
still work as before if pkg-config isn't installed, it'll just use the
old zlib detection logic without pkg-config.

Reported-by: Marc Hörsken

Fixes #972
---
 configure.ac | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 3c00ae107..5e769301e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -892,13 +892,16 @@ else
   fi
 
   if test -z "$OPT_ZLIB" ; then
-    PKG_CHECK_MODULES([ZLIB], [zlib],
+
+    m4_ifdef([PKG_CHECK_MODULES], [
+      PKG_CHECK_MODULES([ZLIB], [zlib],
         [ LIBS="${ZLIB_LIBS} $LIBS"
           CPPFLAGS="${ZLIB_CFLAGS} $CPPFLAGS"
           HAVE_LIBZ="1"
         ],
         [
         ])
+    ])
 
     if test -z "$HAVE_LIBZ"; then
 
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