Fixed bug 2508 - don't redefine WIN32_LEAN_AND_MEAN
diff --git a/include/SDL_opengl.h b/include/SDL_opengl.h
index b48ea7a..43fc319 100644
--- a/include/SDL_opengl.h
+++ b/include/SDL_opengl.h
@@ -33,7 +33,9 @@
#ifndef __IPHONEOS__
#ifdef __WIN32__
+#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
+#endif
#ifndef NOMINMAX
#define NOMINMAX /* Don't defined min() and max() */
#endif