From Anders F Bjorklund: When switching to "UNIX-style paths" as needed for the new includes, including <GL/gl.h> and <GL/glu.h> doesn't work anymore on Mac OS... The two headers are really located in the OpenGL SDK 1.2 CFM like this: OpenGL:Headers:gl.h OpenGL:Headers:glu.h There are also some compat copies, that *used* to work with Mac paths: OpenGL:Headers:GL/gl.h OpenGL:Headers:GL/glu.h The easiest fix is to make SDL_opengl.h include the proper header names, by adding a special case for the MACOS platform in addition to the MACOSX

#include "Processes.r"

resource 'SIZE' (-1) {
	reserved,
	acceptSuspendResumeEvents,
	reserved,
	canBackground,
	doesActivateOnFGSwitch,
	backgroundAndForeground,
	getFrontClicks,
	ignoreAppDiedEvents,
	is32BitCompatible,
	isHighLevelEventAware,
	onlyLocalHLEvents,
	notStationeryAware,
	useTextEditServices,
	reserved,
	reserved,
	reserved,
	5242880,		// 5 megs minimum
	5242880			// 5 megs maximum
};