# diff -pU5 panel/panel-application.c{.old,}
--- a/panel/panel-application.c	2023-04-04 21:17:34.257898577 -0400
+++ b/panel/panel-application.c	2023-04-04 21:32:03.423918092 -0400
@@ -237,11 +237,12 @@ panel_application_init (PanelApplication
   application->autosave_timer_id = g_timeout_add_seconds (AUTOSAVE_INTERVAL,
       panel_application_autosave_timer, application);
 
   /* warn the user about restricted features on Wayland */
   display = gdk_display_get_default ();
-  if (GDK_IS_WAYLAND_DISPLAY (display))
+#ifdef GDK_WINDOWING_WAYLAND
+if (GDK_IS_WAYLAND_DISPLAY (display))
     {
       if (! gtk_layer_is_supported ())
         g_warning ("Wayland detected without layer-shell support (either because of your"
                    " compositor or because Xfce4-panel was built without this support):"
                    " Xfce4-panel might not look like a panel and many of its features will"
@@ -250,10 +251,11 @@ panel_application_init (PanelApplication
         g_warning ("Wayland detected without foreign-toplevel-management support (your"
                    " compositor does not seem to support it): Some Xfce4-panel features will"
                    " not work (e.g. intellihide), as well as some plugins (e.g. ShowDesktop,"
                    " Tasklist, WindowMenu)");
     }
+#endif
 }
 
 
 
 static void