diff -up tigervnc-1.2.80-20130314svn5065/unix/xserver/hw/vnc/xvnc.cc.glx tigervnc-1.2.80-20130314svn5065/unix/xserver/hw/vnc/xvnc.cc
--- tigervnc-1.2.80-20130314svn5065/unix/xserver/hw/vnc/xvnc.cc.glx	2013-02-19 13:51:29.000000000 +0000
+++ tigervnc-1.2.80-20130314svn5065/unix/xserver/hw/vnc/xvnc.cc	2013-12-09 17:03:52.147179079 +0000
@@ -1564,6 +1564,18 @@ static void vfbClientStateChange(Callbac
   dispatchException &= ~DE_RESET;
 }
 
+#if XORG >= 113
+#ifdef GLXEXT
+extern "C" void GlxExtensionInit(void);
+
+static ExtensionModule glxExt = {
+    GlxExtensionInit,
+    "GLX",
+    &noGlxExtension
+};
+#endif
+#endif
+
 void
 InitOutput(ScreenInfo *screenInfo, int argc, char **argv)
 {
@@ -1573,6 +1585,13 @@ InitOutput(ScreenInfo *screenInfo, int a
     int i;
     int NumFormats = 0;
 
+#if XORG >= 113
+#ifdef GLXEXT
+    if (serverGeneration == 1)
+        LoadExtension(&glxExt, TRUE);
+#endif
+#endif
+
     /* initialize pixmap formats */
 
     /* must have a pixmap depth to match every screen depth */