diff -r 49b2cb56db6e -r 698c98b83cbb configure
--- a/configure	Thu May 31 19:23:30 2012 +0300
+++ b/configure	Fri Jun 01 19:42:15 2012 -0300
@@ -22181,6 +22181,8 @@
               #include <X11/extensions/Xext.h>
               #include <X11/extensions/extutil.h>
 
+extern XExtDisplayInfo* XextAddDisplay(XExtensionInfo* a,Display* b,_Xconst char* c,XExtensionHooks* d,int e,XPointer f);
+
 int
 main ()
 {