--- gtk+-3.12.1-2/gtk/gtkdialog.c	2014-04-11 18:31:32.000000000 -0400
+++ gtk+-3.12.1/gtk/gtkdialog.c	2014-04-23 07:07:53.000000000 -0400
@@ -45,6 +45,7 @@
 #include "gtktypebuiltins.h"
 #include "deprecated/gtkstock.h"
 #include "gtksizegroup.h"
+#include "a11y/gtkcontaineraccessible.h"
 
 /**
  * SECTION:gtkdialog
@@ -308,6 +309,27 @@
           gtk_style_context_add_class (gtk_widget_get_style_context (label), "title");
           gtk_box_set_center_widget (GTK_BOX (box), label);
           g_signal_connect_object (dialog, "notify::title", G_CALLBACK (update_title), label, 0);
+
+		GtkWidget *button;
+		GtkWidget *image = NULL;
+		AtkObject *accessible;
+		button = gtk_button_new ();
+		gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
+		image = gtk_image_new_from_icon_name ("window-close-symbolic", GTK_ICON_SIZE_MENU);
+		gtk_style_context_add_class (gtk_widget_get_style_context (button), "titlebutton");
+		g_object_set (image, "use-fallback", TRUE, NULL);
+		gtk_container_add (GTK_CONTAINER (button), image);
+		gtk_widget_set_can_focus (button, FALSE);
+		gtk_widget_show_all (button);
+		g_signal_connect_swapped(button, "clicked", G_CALLBACK(gtk_dialog_close), dialog);
+		accessible = gtk_widget_get_accessible (button);
+		if (GTK_IS_ACCESSIBLE (accessible))
+		atk_object_set_name (accessible, _("Close"));
+		gtk_box_pack_end(GTK_BOX (box), button, 0, 0, 0);
         }
 
       gtk_window_set_titlebar (GTK_WINDOW (dialog), box);