diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8b863de29..72d8c2ba4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -483,6 +483,9 @@ ENDIF()
 
 IF ((OPENGL_PROFILE STREQUAL "GL3") OR (OPENGL_PROFILE STREQUAL "GLCORE"))
     OPTION(OSG_GL3_AVAILABLE "Set to OFF to disable use of OpenGL 3.x functions library." ON )
+    if(APPLE)
+        add_definitions(-DGL_DO_NOT_WARN_IF_MULTI_GL_VERSION_HEADERS_INCLUDED)
+    endif()
 ELSE()
     OPTION(OSG_GL3_AVAILABLE "Set to OFF to disable use of OpenGL 3.x functions library." OFF )
 ENDIF()