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21 #ifndef GR_CPP_GR_OPENGL_HEADERS_H
22 #define GR_CPP_GR_OPENGL_HEADERS_H
28 #if !defined(__gl_h_) && !defined(__GL_H__)
34 #ifdef KJB_HAVE_OSMESA
35 #include <GL/osmesa.h>
40 #ifdef KJB_HAVE_OPENGL
42 #include <OpenGL/glu.h>
43 #include <OpenGL/gl.h>
45 #include <GLUT/glut.h>
66 static const GLenum GL_RED = -1;
67 static const GLenum GL_DEPTH_COMPONENT = -1;