diff --git a/auto/src/glew_head.h b/auto/src/glew_head.h
index cffa472..0dcaabd 100644
--- a/auto/src/glew_head.h
+++ b/auto/src/glew_head.h
@@ -2,7 +2,7 @@
 #define __glew_h__
 #define __GLEW_H__
 
-#if defined(__gl_h_) || defined(__GL_H__)
+#if defined(__gl_h_) || defined(__GL_H__) || defined(__X_GL_H)
 #error gl.h included before glew.h
 #endif
 #if defined(__glext_h_) || defined(__GLEXT_H_)
@@ -14,6 +14,7 @@
 
 #define __gl_h_
 #define __GL_H__
+#define __X_GL_H
 #define __glext_h_
 #define __GLEXT_H_
 #define __gl_ATI_h_