In testdyngl.c the event type was being anded (&) with SDL_KEYDOWN and if the result was none zero the program was quiting. This is very weird because it was working earlier this week. I added some more trace code to SDL_x11events.c In SDL_X11opengl.c I modified SDL_GL_GetSwapInterval() so that it returns a pretty good value even if you have the SGI swap extension instead of the MESA swap extension. I just saved the value you set and return it too you.

{
	FilesToRename = {
		"SDLApp_Prefix.pch" = "ÇPROJECTNAMEÈ_Prefix.pch";
	};
	FilesToMacroExpand = (
		"ÇPROJECTNAMEÈ_Prefix.pch",
		"Info.plist",
		"English.lproj/InfoPlist.strings",
		"main.c",
	);
	Description = "This project builds an SDL-based application.";
}