gdk-workaround

diff --git a/pidgin/gtk3compat.h b/pidgin/gtk3compat.h
--- a/pidgin/gtk3compat.h
+++ b/pidgin/gtk3compat.h
@@ -36,6 +36,9 @@

 #define gdk_x11_window_get_xid GDK_WINDOW_XWINDOW
 #define gtk_widget_get_preferred_size(x,y,z) gtk_widget_size_request(x,z)
+#define GDK_IS_X11_WINDOW(window) TRUE
+#define GDK_IS_WIN32_WINDOW(window) TRUE
+#define GDK_IS_QUARTZ_WINDOW(window) TRUE

 #if !GTK_CHECK_VERSION(2,24,0)