From 132cc8387185badf29f150f3f052a15f629c6f77 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Peter=20K=C3=BCmmel?= <kuemmel@lyx.org>
Date: Tue, 19 Jan 2016 17:54:43 +0100
Subject: [PATCH] remove warning about alreday defined Z_PREFIX

---
 3rdparty/zlib/1.2.8/zconf.h.cmakein | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/3rdparty/zlib/1.2.8/zconf.h.cmakein b/3rdparty/zlib/1.2.8/zconf.h.cmakein
index 043019cda1..1f4778b045 100644
--- a/3rdparty/zlib/1.2.8/zconf.h.cmakein
+++ b/3rdparty/zlib/1.2.8/zconf.h.cmakein
@@ -7,7 +7,9 @@
 
 #ifndef ZCONF_H
 #define ZCONF_H
+#ifndef Z_PREFIX
 #cmakedefine Z_PREFIX
+#endif
 #cmakedefine Z_HAVE_UNISTD_H
 
 /*