$NetBSD: patch-src_glu_CMakeLists.txt,v 1.1 2016/05/25 14:38:48 bouyer Exp $
Make sure to use our glu.h before the base libraries ones.

--- src/glu/CMakeLists.txt.orig	2016-05-25 16:23:41.000000000 +0200
+++ src/glu/CMakeLists.txt	2016-05-25 16:24:01.000000000 +0200
@@ -17,8 +17,8 @@
   ADD_DEFINITIONS( " -g -fno-strict-aliasing -O2")
 ENDIF(NOT WIN32 AND NOT APPLE)
 
-INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/include)
-INCLUDE_DIRECTORIES(include)
+INCLUDE_DIRECTORIES(BEFORE ${CMAKE_SOURCE_DIR}/include)
+INCLUDE_DIRECTORIES(BEFORE include)
 
 IF(WIN32)
     IF(MSVC)