+// IRIX headers call this differently
+#ifdef __SGI__
+ #ifndef GLX_SAMPLE_BUFFERS_ARB
+ #define GLX_SAMPLE_BUFFERS_ARB GLX_SAMPLE_BUFFERS_SGIS
+ #endif
+ #ifndef GLX_SAMPLES_ARB
+ #define GLX_SAMPLES_ARB GLX_SAMPLES_SGIS
+ #endif
+#endif // __SGI__
+