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