[gtk+/gtk-3-14] window: GtkPlug is conditionally supported on X11 only

[Emmanuele Bassi <ebassi src gnome org>]

commit 0b8f666e022d983db2cefaffb24315dc34b26673
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Nov 10 14:08:20 2014 +0000

    window: GtkPlug is conditionally supported on X11 only
    
    We cannot do a type check on it if we don't have the X11 backend
    compiled in.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=739885

 gtk/gtkwindow.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index e846c41..7f5aae7 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -1601,10 +1601,17 @@ gtk_window_constructed (GObject *object)
 {
   GtkWindow *window = GTK_WINDOW (object);
   GtkWindowPrivate *priv = window->priv;
+  gboolean is_plug;
 
   G_OBJECT_CLASS (gtk_window_parent_class)->constructed (object);
 
-  if (priv->type == GTK_WINDOW_TOPLEVEL && !GTK_IS_PLUG (window))
+#ifdef GDK_WINDOWING_X11
+  is_plug = GTK_IS_PLUG (window);
+#else
+  is_plug = FALSE;
+#endif
+
+  if (priv->type == GTK_WINDOW_TOPLEVEL && !is_plug)
     {
       priv->multipress_gesture = gtk_gesture_multi_press_new (GTK_WIDGET (object));
       gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->multipress_gesture), 0);