#endif
#ifndef GLXPbuffer
-#define GLXPbuffer GLXPbufferSGIX
+# ifdef GLXPbufferSGIX
+# define GLXPbuffer GLXPbufferSGIX
+# endif
#endif
#ifndef GLXFBConfig
-#define GLXFBConfig GLXFBConfigSGIX
+# ifdef GLXFBConfigSGIX
+# define GLXFBConfig GLXFBConfigSGIX
+# endif
#endif
typedef GLXFBConfig *(*glXChooseFBConfigProc) (Display *dpy, int screen, int *attribList, int *nitems);