diff --git a/auto/src/glew_head.c b/auto/src/glew_head.c
index b8c6854..d153cde 100644
--- a/auto/src/glew_head.c
+++ b/auto/src/glew_head.c
@@ -1,4 +1,8 @@
+#ifndef GLEW_INCLUDE
 #include <GL/glew.h>
+#else
+#include GLEW_INCLUDE
+#endif
 
 #if defined(GLEW_OSMESA)
 #  define GLAPI extern