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.

//
// Prefix header for all source files of the 'ÇPROJECTNAMEÈ' target in the 'ÇPROJECTNAMEÈ' project
//

#include "SDL.h"

#ifdef __OBJC__
    #import <Cocoa/Cocoa.h>
#endif