add missing dependency

package/gtk+/Makefile

@@ -12,7 +12,7 @@ PKG_DESCR:=		GTK+ library
 PKG_SECTION:=		libs
 PKG_DEPENDS:=		glib
 PKG_BUILDDEP:=		cairo atk pango libXext renderproto libXrender
-PKG_BUILDDEP+=		gdk-pixbuf libXcomposite
+PKG_BUILDDEP+=		gdk-pixbuf libXcomposite libXdamage
 PKG_URL:=		http://www.gtk.org/
 PKG_SITES:=		http://ftp.gnome.org/pub/gnome/sources/gtk+/$(PKG_EXTRAVER)/
 PKG_NEED_CXX:=		1