Support Apple include files for OpenGL

src/graphics.cpp

@@ -1,5 +1,11 @@
+#ifdef __APPLE__
+#include <OpenGL/glew.h>
+#include <OpenGL/freeglut.h>
+#else
 #include <GL/glew.h>
-#include <GL/freeglut.h> //includes glu.h and gl.h
+#include <GL/freeglut.h>
+#endif
+
 #include <glm/mat4x4.hpp>
 #include <glm/ext/matrix_transform.hpp>
 #include <glm/gtc/type_ptr.hpp>

src/graphics.hpp

@@ -1,7 +1,12 @@
 #ifndef GRAPHICS_H
 #define GRAPHICS_H
 
+#ifdef __APPLE__
+#include <OpenGL/gl.h>
+#else
 #include <GL/gl.h>
+#endif
+
 #include <glm/vec2.hpp>
 
 void initGraphics ();

src/modelpart.cpp

@@ -1,4 +1,9 @@
+#ifdef __APPLE__
+#include <OpenGL/glew.h>
+#else
 #include <GL/glew.h>
+#endif
+
 #include <glm/mat4x4.hpp>
 #include <glm/gtc/type_ptr.hpp>