Added OpenGL includes for Mac OS X

include/main.h

@@ -5,8 +5,18 @@
 #include <windows.h>			// Header file for windows
 #endif
 #include <cstdio>			// Header file for standard input/output
+#ifdef WIN32
 #include <GL/gl.h>			// Header file for OpenGL32 library
 #include <GL/glu.h>			// Header file for Glu32 library
+#endif
+#ifdef __linux
+#include <GL/gl.h>			// Header file for OpenGL32 library
+#include <GL/glu.h>			// Header file for Glu32 library
+#endif
+#ifdef __APPLE__
+#include <gl.h>				// Header file for OpenGL32 library
+#include <glu.h>				// Header file for Glu32 library
+#endif
 #include <math.h>
 
 #include "camera.h"

include/tga.h

@@ -4,8 +4,14 @@
 #pragma comment(lib, "OpenGL32.lib")
 #ifdef WIN32
 #include <windows.h> //I think this was only needed because gl.h uses it
-#endif
 #include <GL/gl.h>
+#endif
+#ifdef __linux
+#include <GL/gl.h>
+#endif
+#ifdef __APPLE__
+#include <gl.h>
+#endif
 #include <cstdio>
 #include <string>
 #include "texture.h"