GetVisualFromFBConfig(Display *dpy, int screen, FBCONFIG config);
+extern GLXContext
+CreateContext(Display *dpy, int screen, FBCONFIG config);
+
+
+extern void
+DestroyContext(Display *dpy, GLXContext ctx);
+
+
extern PBUFFER
CreatePbuffer(Display *dpy, int screen, FBCONFIG config,
int width, int height, Bool preserve, Bool largest);