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-rw-r--r--include/GL/gl.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/GL/gl.h b/include/GL/gl.h
index 5f8bc2b708..c163171dc7 100644
--- a/include/GL/gl.h
+++ b/include/GL/gl.h
@@ -85,7 +85,9 @@
* glut.h or gl.h.
*/
#if defined(_WIN32) && !defined(APIENTRY) && !defined(__CYGWIN__)
+#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN 1
+#endif
#include <windows.h>
#endif