https://bugs.freedesktop.org/attachment.cgi?id=38376
http://bugs.gentoo.org/show_bug.cgi?id=335619

--- libXext-1.1.2/src/Xge.c
+++ libXext-1.1.2/src/Xge.c
@@ -294,7 +294,7 @@
 /*
  * Extensions need to register callbacks for their events.
  */
-Bool
+_X_HIDDEN Bool
 xgeExtRegister(Display* dpy, int offset, XExtensionHooks* callbacks)
 {
     XGEExtNode* newExt;