--- a/Rendering/OpenGL/vtkOpenGL.h
+++ b/Rendering/OpenGL/vtkOpenGL.h
@@ -19,7 +19,8 @@
 #include "vtkConfigure.h"
 
 // To prevent gl.h to include glext.h provided by the system
-#define GL_GLEXT_LEGACY
+// https://bugzilla.redhat.com/show_bug.cgi?id=1138466
+// #define GL_GLEXT_LEGACY
 #if defined(__APPLE__) && defined(VTK_USE_COCOA)
 # include <OpenGL/gl.h> // Include OpenGL API.
 #else