Add missing X11/Xlib.h include required for X11/extensions/sync.h

diff --git a/gdk/x11/gdkwindow-x11.h b/gdk/x11/gdkwindow-x11.h
index fd63e8b462132366a63cd62feb97a12311967c13..0c02b67652302086fe16f8bbba218121387c9402 100644 (file)
--- a/gdk/x11/gdkwindow-x11.h
+++ b/gdk/x11/gdkwindow-x11.h
@@ -35,6 +35,7 @@
 #endif
 
 #ifdef HAVE_XSYNC
+#include <X11/Xlib.h>
 #include <X11/extensions/sync.h>
 #endif