--- cmake-2.8.5/Utilities/cm_zlib.h.ark	2011-08-17 13:24:00.493341722 +0200
+++ cmake-2.8.5/Utilities/cm_zlib.h	2011-08-17 13:24:25.216675055 +0200
@@ -15,6 +15,7 @@
 /* Use the zlib library configured for CMake.  */
 #include "cmThirdParty.h"
 #ifdef CMAKE_USE_SYSTEM_ZLIB
+#define ZLIB_INTERNAL 1
 # include <zlib.h>
 #else
 # include <cmzlib/zlib.h>