diff --git a/config/config.mk b/config/config.mk
index 00410e0e40ba..b620f9e6b746 100644
--- a/config/config.mk
+++ b/config/config.mk
@@ -814,3 +814,7 @@ PLY_INCLUDE = -I$(topsrcdir)/other-licenses/ply
 endif
 
 export CL_INCLUDES_PREFIX
+
+ifeq ($(MOZ_WIDGET_GTK),2)
+MOZ_GTK2_CFLAGS := -I$(topsrcdir)/widget/gtk2/compat $(MOZ_GTK2_CFLAGS)
+endif
diff --git a/configure.in b/configure.in
index bf82d1be8ffa..7782b5294dc4 100644
--- a/configure.in
+++ b/configure.in
@@ -65,7 +65,7 @@ PYTHON_VERSION_MAJOR=2
 PYTHON_VERSION_MINOR=5
 CAIRO_VERSION=1.10
 PANGO_VERSION=1.14.0
-GTK2_VERSION=2.10.0
+GTK2_VERSION=2.18.0
 WINDRES_VERSION=2.14.90
 W32API_VERSION=3.14
 GNOMEVFS_VERSION=2.0
@@ -4435,6 +4435,8 @@ dnl ========================================================
 dnl = Enable the toolkit as needed                         =
 dnl ========================================================
 
+MOZ_WIDGET_GTK=
+
 case "$MOZ_WIDGET_TOOLKIT" in
 
 cairo-windows)
@@ -4458,7 +4460,8 @@ cairo-gtk2|cairo-gtk2-x11)
     TK_CFLAGS='$(MOZ_GTK2_CFLAGS)'
     TK_LIBS='$(MOZ_GTK2_LIBS)'
     AC_DEFINE(MOZ_WIDGET_GTK2)
-    AC_DEFINE(MOZ_WIDGET_GTK,2)
+    MOZ_WIDGET_GTK=2
+    AC_DEFINE_UNQUOTED(MOZ_WIDGET_GTK,$MOZ_WIDGET_GTK)
     MOZ_PDF_PRINTING=1
     MOZ_INSTRUMENT_EVENT_LOOP=1
     ;;
@@ -4732,6 +4735,7 @@ AC_SUBST(MOZ_ENABLE_QTMOBILITY)
 AC_SUBST(MOZ_ENABLE_XREMOTE)
 AC_SUBST(MOZ_GTK2_CFLAGS)
 AC_SUBST(MOZ_GTK2_LIBS)
+AC_SUBST(MOZ_WIDGET_GTK)
 AC_SUBST(MOZ_QT_CFLAGS)
 AC_SUBST(MOZ_QT_LIBS)
 
diff --git a/dom/plugins/base/nsPluginNativeWindowGtk2.cpp b/dom/plugins/base/nsPluginNativeWindowGtk2.cpp
index 44559818564d..e53a11a1388f 100644
--- a/dom/plugins/base/nsPluginNativeWindowGtk2.cpp
+++ b/dom/plugins/base/nsPluginNativeWindowGtk2.cpp
@@ -17,7 +17,6 @@
 #include <gdk/gdkx.h>
 #include <gdk/gdk.h>
 
-#include "gtk2compat.h"
 #include "gtk2xtbin.h"
 #include "mozilla/X11Util.h"
 
diff --git a/dom/plugins/ipc/PluginModuleChild.cpp b/dom/plugins/ipc/PluginModuleChild.cpp
index 504f8206f489..6275eb6b4fc7 100644
--- a/dom/plugins/ipc/PluginModuleChild.cpp
+++ b/dom/plugins/ipc/PluginModuleChild.cpp
@@ -23,7 +23,6 @@
 #if (MOZ_WIDGET_GTK == 3)
 #include <gtk/gtkx.h>
 #endif
-#include "gtk2compat.h"
 #endif
 
 #include "nsIFile.h"
diff --git a/gfx/thebes/gfxPlatformGtk.cpp b/gfx/thebes/gfxPlatformGtk.cpp
index 450cda627007..a77bb0c14b67 100644
--- a/gfx/thebes/gfxPlatformGtk.cpp
+++ b/gfx/thebes/gfxPlatformGtk.cpp
@@ -28,9 +28,6 @@
 
 #include "cairo.h"
 #include <gtk/gtk.h>
-#if (MOZ_WIDGET_GTK == 2)
-#include "gtk2compat.h"
-#endif
 
 #include "gfxImageSurface.h"
 #ifdef MOZ_X11
diff --git a/js/src/config/config.mk b/js/src/config/config.mk
index 00410e0e40ba..b620f9e6b746 100644
--- a/js/src/config/config.mk
+++ b/js/src/config/config.mk
@@ -814,3 +814,7 @@ PLY_INCLUDE = -I$(topsrcdir)/other-licenses/ply
 endif
 
 export CL_INCLUDES_PREFIX
+
+ifeq ($(MOZ_WIDGET_GTK),2)
+MOZ_GTK2_CFLAGS := -I$(topsrcdir)/widget/gtk2/compat $(MOZ_GTK2_CFLAGS)
+endif
diff --git a/widget/gtk2/Makefile.in b/widget/gtk2/Makefile.in
index 4723e23edc3e..36b71263645a 100644
--- a/widget/gtk2/Makefile.in
+++ b/widget/gtk2/Makefile.in
@@ -78,7 +78,6 @@ EXPORTS		= \
                 nsGTKToolkit.h \
 		nsIImageToPixbuf.h \
 		mozcontainer.h \
-		gtk2compat.h \
 		$(NULL)
 
 ifdef NATIVE_THEME_SUPPORT
diff --git a/widget/gtk2/compat/gdk/gdkdnd.h b/widget/gtk2/compat/gdk/gdkdnd.h
new file mode 100644
index 000000000000..e20cdea8433e
--- /dev/null
+++ b/widget/gtk2/compat/gdk/gdkdnd.h
@@ -0,0 +1,33 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GDKDND_WRAPPER_H
+#define GDKDND_WRAPPER_H
+
+#define gdk_drag_context_get_actions gdk_drag_context_get_actions_
+#define gdk_drag_context_list_targets gdk_drag_context_list_targets_
+#define gdk_drag_context_get_dest_window gdk_drag_context_get_dest_window_
+#include_next <gdk/gdkdnd.h>
+#undef gdk_drag_context_get_actions
+#undef gdk_drag_context_list_targets
+#undef gdk_drag_context_get_dest_window
+
+static inline GdkDragAction
+gdk_drag_context_get_actions(GdkDragContext *context)
+{
+  return context->actions;
+}
+
+static inline GList *
+gdk_drag_context_list_targets(GdkDragContext *context)
+{
+  return context->targets;
+}
+
+static inline GdkWindow *
+gdk_drag_context_get_dest_window(GdkDragContext *context)
+{
+  return context->dest_window;
+}
+#endif /* GDKDND_WRAPPER_H */
diff --git a/widget/gtk2/compat/gdk/gdkvisual.h b/widget/gtk2/compat/gdk/gdkvisual.h
new file mode 100644
index 000000000000..6476b4494677
--- /dev/null
+++ b/widget/gtk2/compat/gdk/gdkvisual.h
@@ -0,0 +1,17 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GDKVISUAL_WRAPPER_H
+#define GDKVISUAL_WRAPPER_H
+
+#define gdk_visual_get_depth gdk_visual_get_depth_
+#include_next <gdk/gdkvisual.h>
+#undef gdk_visual_get_depth
+
+static inline gint
+gdk_visual_get_depth(GdkVisual *visual)
+{
+  return visual->depth;
+}
+#endif /* GDKVISUAL_WRAPPER_H */
diff --git a/widget/gtk2/compat/gdk/gdkwindow.h b/widget/gtk2/compat/gdk/gdkwindow.h
new file mode 100644
index 000000000000..1b69da9f2825
--- /dev/null
+++ b/widget/gtk2/compat/gdk/gdkwindow.h
@@ -0,0 +1,25 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GDKWINDOW_WRAPPER_H
+#define GDKWINDOW_WRAPPER_H
+
+#define gdk_window_get_display gdk_window_get_display_
+#define gdk_window_get_screen gdk_window_get_screen_
+#include_next <gdk/gdkwindow.h>
+#undef gdk_window_get_display
+#undef gdk_window_get_screen
+
+static inline GdkDisplay *
+gdk_window_get_display(GdkWindow *window)
+{
+  return gdk_drawable_get_display(GDK_DRAWABLE(window));
+}
+
+static inline GdkScreen*
+gdk_window_get_screen(GdkWindow *window)
+{
+  return gdk_drawable_get_screen (window);
+}
+#endif /* GDKWINDOW_WRAPPER_H */
diff --git a/widget/gtk2/compat/gdk/gdkx.h b/widget/gtk2/compat/gdk/gdkx.h
new file mode 100644
index 000000000000..422358c3a324
--- /dev/null
+++ b/widget/gtk2/compat/gdk/gdkx.h
@@ -0,0 +1,25 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GDKX_WRAPPER_H
+#define GDKX_WRAPPER_H
+
+#define gdk_x11_window_lookup_for_display gdk_x11_window_lookup_for_display_
+#define gdk_x11_window_get_xid gdk_x11_window_get_xid_
+#include_next <gdk/gdkx.h>
+#undef gdk_x11_window_lookup_for_display
+#undef gdk_x11_window_get_xid
+
+static inline GdkWindow *
+gdk_x11_window_lookup_for_display(GdkDisplay *display, Window window)
+{
+  return gdk_window_lookup_for_display(display, window);
+}
+
+static inline Window
+gdk_x11_window_get_xid(GdkWindow *window)
+{
+  return(GDK_WINDOW_XWINDOW(window));
+}
+#endif /* GDKX_WRAPPER_H */
diff --git a/widget/gtk2/compat/glib/gmem.h b/widget/gtk2/compat/glib/gmem.h
new file mode 100644
index 000000000000..1e728197e310
--- /dev/null
+++ b/widget/gtk2/compat/glib/gmem.h
@@ -0,0 +1,56 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMEM_WRAPPER_H
+#define GMEM_WRAPPER_H
+
+#define g_malloc_n g_malloc_n_
+#define g_malloc0_n g_malloc0_n_
+#define g_realloc_n g_realloc_n_
+#include_next <glib/gmem.h>
+#undef g_malloc_n
+#undef g_malloc0_n
+#undef g_realloc_n
+
+#include <glib/gmessages.h>
+
+#undef g_new
+#define g_new(type, num) \
+    ((type *) g_malloc_n((num), sizeof(type)))
+
+#undef g_new0
+#define g_new0(type, num) \
+    ((type *) g_malloc0_n((num), sizeof(type)))
+
+#undef g_renew
+#define g_renew(type, ptr, num) \
+    ((type *) g_realloc_n(ptr, (num), sizeof(type)))
+
+#define _CHECK_OVERFLOW(num, type_size) \
+    if (G_UNLIKELY(type_size > 0 && num > G_MAXSIZE / type_size)) { \
+      g_error("%s: overflow allocating %" G_GSIZE_FORMAT "*%" G_GSIZE_FORMAT " bytes", \
+              G_STRLOC, num, type_size); \
+    }
+
+static inline gpointer
+g_malloc_n(gsize num, gsize type_size)
+{
+  _CHECK_OVERFLOW(num, type_size)
+  return g_malloc(num * type_size);
+}
+
+static inline gpointer
+g_malloc0_n(gsize num, gsize type_size)
+{
+  _CHECK_OVERFLOW(num, type_size)
+  return g_malloc0(num * type_size);
+}
+
+static inline gpointer
+g_realloc_n(gpointer ptr, gsize num, gsize type_size)
+{
+  _CHECK_OVERFLOW(num, type_size)
+  return g_realloc(ptr, num * type_size);
+}
+#endif /* GMEM_WRAPPER_H */
diff --git a/widget/gtk2/compat/gtk/gtkwidget.h b/widget/gtk2/compat/gtk/gtkwidget.h
new file mode 100644
index 000000000000..ff0163b00cf1
--- /dev/null
+++ b/widget/gtk2/compat/gtk/gtkwidget.h
@@ -0,0 +1,47 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GTKWIDGET_WRAPPER_H
+#define GTKWIDGET_WRAPPER_H
+
+#define gtk_widget_set_mapped gtk_widget_set_mapped_
+#define gtk_widget_get_mapped gtk_widget_get_mapped_
+#define gtk_widget_set_realized gtk_widget_set_realized_
+#define gtk_widget_get_realized gtk_widget_get_realized_
+#include_next <gtk/gtkwidget.h>
+#undef gtk_widget_set_mapped
+#undef gtk_widget_get_mapped
+#undef gtk_widget_set_realized
+#undef gtk_widget_get_realized
+
+static inline void
+gtk_widget_set_mapped(GtkWidget *widget, gboolean mapped)
+{
+  if (mapped)
+    GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
+  else
+    GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
+}
+
+static inline gboolean
+gtk_widget_get_mapped(GtkWidget *widget)
+{
+  return GTK_WIDGET_MAPPED (widget);
+}
+
+static inline void
+gtk_widget_set_realized(GtkWidget *widget, gboolean realized)
+{
+  if (realized)
+    GTK_WIDGET_SET_FLAGS(widget, GTK_REALIZED);
+  else
+    GTK_WIDGET_UNSET_FLAGS(widget, GTK_REALIZED);
+}
+
+static inline gboolean
+gtk_widget_get_realized(GtkWidget *widget)
+{
+  return GTK_WIDGET_REALIZED (widget);
+}
+#endif /* GTKWIDGET_WRAPPER_H */
diff --git a/widget/gtk2/compat/gtk/gtkwindow.h b/widget/gtk2/compat/gtk/gtkwindow.h
new file mode 100644
index 000000000000..3aaba27c5be8
--- /dev/null
+++ b/widget/gtk2/compat/gtk/gtkwindow.h
@@ -0,0 +1,20 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GTKWINDOW_WRAPPER_H
+#define GTKWINDOW_WRAPPER_H
+
+#define gtk_window_group_get_current_grab gtk_window_group_get_current_grab_
+#include_next <gtk/gtkwindow.h>
+#undef gtk_window_group_get_current_grab
+
+static inline GtkWidget *
+gtk_window_group_get_current_grab(GtkWindowGroup *window_group)
+{
+  if (!window_group->grabs)
+    return NULL;
+
+  return GTK_WIDGET(window_group->grabs->data);
+}
+#endif /* GTKWINDOW_WRAPPER_H */
diff --git a/widget/gtk2/gtk2compat.h b/widget/gtk2/gtk2compat.h
deleted file mode 100644
index a77f2ed5cc45..000000000000
--- a/widget/gtk2/gtk2compat.h
+++ /dev/null
@@ -1,229 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:expandtab:shiftwidth=2:tabstop=2:
- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-/**
- * gtk2compat.h: GTK2 compatibility routines
- *
- * gtk2compat provides an API which is not defined in GTK2.
- */
-
-#ifndef _GTK2_COMPAT_H_
-#define _GTK2_COMPAT_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-#if !GTK_CHECK_VERSION(2, 14, 0)
-static inline GdkWindow*
-gtk_widget_get_window(GtkWidget *widget)
-{
-  return widget->window;
-}
-
-static inline const guchar *
-gtk_selection_data_get_data(GtkSelectionData *selection_data)
-{
-  return selection_data->data;
-}
-
-static inline gint
-gtk_selection_data_get_length(GtkSelectionData *selection_data)
-{
-  return selection_data->length;
-}
-
-static inline GdkAtom
-gtk_selection_data_get_target(GtkSelectionData *selection_data)
-{
-  return selection_data->target;
-}
-
-static inline GtkWidget *
-gtk_dialog_get_content_area(GtkDialog *dialog)
-{
-  return dialog->vbox;
-}
-
-static inline GdkWindow *
-gtk_plug_get_socket_window(GtkPlug *plug)
-{
-  return plug->socket_window;
-}
-#endif
-
-
-#if !GTK_CHECK_VERSION(2, 16, 0)
-static inline GdkAtom
-gtk_selection_data_get_selection(GtkSelectionData *selection_data)
-{
-  return selection_data->selection;
-}
-#endif
-
-#if !GTK_CHECK_VERSION(2, 18, 0)
-static inline gboolean
-gtk_widget_get_visible(GtkWidget *widget)
-{
-  return GTK_WIDGET_VISIBLE(widget);
-}
-
-static inline gboolean
-gtk_widget_has_focus(GtkWidget *widget)
-{
-  return GTK_WIDGET_HAS_FOCUS(widget);
-}
-
-static inline gboolean
-gtk_widget_has_grab(GtkWidget *widget)
-{
-  return GTK_WIDGET_HAS_GRAB(widget);
-}
-
-static inline void
-gtk_widget_get_allocation(GtkWidget *widget, GtkAllocation *allocation)
-{
-  *allocation = widget->allocation;
-}
-
-static inline void
-gtk_widget_set_allocation(GtkWidget *widget, const GtkAllocation *allocation)
-{
-  widget->allocation = *allocation;
-}
-
-static inline gboolean
-gdk_window_is_destroyed(GdkWindow *window)
-{
-  return GDK_WINDOW_OBJECT(window)->destroyed;
-}
-
-static inline void 
-gtk_widget_set_can_focus(GtkWidget *widget, gboolean can_focus)
-{
-  if (can_focus)
-    GTK_WIDGET_SET_FLAGS (widget, GTK_CAN_FOCUS);
-  else
-    GTK_WIDGET_UNSET_FLAGS (widget, GTK_CAN_FOCUS);
-}
-
-static inline void
-gtk_widget_set_window(GtkWidget *widget, GdkWindow *window)
-{
-  widget->window = window;
-}
-
-static inline gboolean
-gtk_widget_is_toplevel(GtkWidget *widget)
-{
-  return GTK_WIDGET_TOPLEVEL(widget);
-}
-#endif
-
-#if !GTK_CHECK_VERSION(2, 20, 0)
-static inline void
-gtk_widget_set_mapped(GtkWidget *widget, gboolean mapped)
-{
-  if (mapped)
-    GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
-  else
-    GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
-}
-
-static inline gboolean
-gtk_widget_get_mapped(GtkWidget *widget)
-{
-  return GTK_WIDGET_MAPPED (widget);
-}
-
-static inline void
-gtk_widget_set_realized(GtkWidget *widget, gboolean realized)
-{
-  if (realized)
-    GTK_WIDGET_SET_FLAGS(widget, GTK_REALIZED);
-  else
-    GTK_WIDGET_UNSET_FLAGS(widget, GTK_REALIZED);
-}
-
-static inline gboolean
-gtk_widget_get_realized(GtkWidget *widget)
-{
-  return GTK_WIDGET_REALIZED (widget);
-}
-#endif
-
-#if !GTK_CHECK_VERSION(2, 22, 0)
-static inline gint
-gdk_visual_get_depth(GdkVisual *visual)
-{
-  return visual->depth;
-}
-
-static inline GdkDragAction
-gdk_drag_context_get_actions(GdkDragContext *context)
-{
-  return context->actions;
-}
-
-static inline GtkWidget *
-gtk_window_group_get_current_grab(GtkWindowGroup *window_group)
-{
-  if (!window_group->grabs)
-    return NULL;
-
-  return GTK_WIDGET(window_group->grabs->data);
-}
-
-static inline GList *
-gdk_drag_context_list_targets(GdkDragContext *context)
-{
-  return context->targets;
-}
-#endif
-
-#if !GTK_CHECK_VERSION(2, 23, 3)
-static inline GdkWindow *
-gdk_drag_context_get_dest_window(GdkDragContext *context)
-{
-  return context->dest_window;
-}
-#endif
-
-#if !GTK_CHECK_VERSION(2, 24, 0)
-#ifdef GDK_WINDOW_XDISPLAY
-static inline GdkWindow *
-gdk_x11_window_lookup_for_display(GdkDisplay *display, Window window)
-{
-  return gdk_window_lookup_for_display(display, window);
-}
-#endif
-static inline GdkDisplay *
-gdk_window_get_display(GdkWindow *window)
-{
-  return gdk_drawable_get_display(GDK_DRAWABLE(window));
-}
-
-static inline GdkScreen*
-gdk_window_get_screen (GdkWindow *window)
-{
-  return gdk_drawable_get_screen (window);
-}
-#endif
-
-#ifdef GDK_WINDOW_XWINDOW
-static inline Window 
-gdk_x11_window_get_xid(GdkWindow *window)
-{
-  return(GDK_WINDOW_XWINDOW(window));
-}
-#endif
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* _GTK2_COMPAT_H_ */
diff --git a/widget/gtk2/mozcontainer.c b/widget/gtk2/mozcontainer.c
index eae4b12b14cf..91f4eaff5448 100644
--- a/widget/gtk2/mozcontainer.c
+++ b/widget/gtk2/mozcontainer.c
@@ -14,10 +14,6 @@
 #include "maiRedundantObjectFactory.h"
 #endif 
 
-#if defined(MOZ_WIDGET_GTK2)
-#include "gtk2compat.h"
-#endif
-
 /* init methods */
 static void moz_container_class_init          (MozContainerClass *klass);
 static void moz_container_init                (MozContainer      *container);
diff --git a/widget/gtk2/nsClipboard.cpp b/widget/gtk2/nsClipboard.cpp
index 36a3adf54432..df066a08f9f5 100644
--- a/widget/gtk2/nsClipboard.cpp
+++ b/widget/gtk2/nsClipboard.cpp
@@ -31,10 +31,6 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#if (MOZ_WIDGET_GTK == 2)
-#include "gtk2compat.h"
-#endif
-
 using namespace mozilla;
 
 // Callback when someone asks us for the data
diff --git a/widget/gtk2/nsDragService.cpp b/widget/gtk2/nsDragService.cpp
index 13217f999321..4fcdfc557a98 100644
--- a/widget/gtk2/nsDragService.cpp
+++ b/widget/gtk2/nsDragService.cpp
@@ -25,10 +25,6 @@
 #include "nsCRT.h"
 #include "mozilla/Services.h"
 
-#if (MOZ_WIDGET_GTK == 2)
-#include "gtk2compat.h"
-#endif
-
 #include "gfxASurface.h"
 #include "gfxXlibSurface.h"
 #include "gfxContext.h"
diff --git a/widget/gtk2/nsGtkIMModule.cpp b/widget/gtk2/nsGtkIMModule.cpp
index 5b1629f1962e..06caa185280a 100644
--- a/widget/gtk2/nsGtkIMModule.cpp
+++ b/widget/gtk2/nsGtkIMModule.cpp
@@ -24,10 +24,6 @@
 #include "mozilla/Services.h"
 #endif
 
-#if (MOZ_WIDGET_GTK == 2)
-#include "gtk2compat.h"
-#endif
-
 using namespace mozilla;
 using namespace mozilla::widget;
 
diff --git a/widget/gtk2/nsIdleServiceGTK.cpp b/widget/gtk2/nsIdleServiceGTK.cpp
index 89a4043583f2..f61f231a84e0 100644
--- a/widget/gtk2/nsIdleServiceGTK.cpp
+++ b/widget/gtk2/nsIdleServiceGTK.cpp
@@ -12,9 +12,6 @@
 #include "nsDebug.h"
 #include "prlink.h"
 #include "prlog.h"
-#if (MOZ_WIDGET_GTK == 2)
-#include "gtk2compat.h"
-#endif
 
 #ifdef PR_LOGGING
 static PRLogModuleInfo* sIdleLog = nullptr;
diff --git a/widget/gtk2/nsPrintDialogGTK.cpp b/widget/gtk2/nsPrintDialogGTK.cpp
index 0be3f62d674a..8e7ce6263ec2 100644
--- a/widget/gtk2/nsPrintDialogGTK.cpp
+++ b/widget/gtk2/nsPrintDialogGTK.cpp
@@ -6,7 +6,6 @@
 #include <gtk/gtk.h>
 #if (MOZ_WIDGET_GTK == 2)
 #include <gtk/gtkprintunixdialog.h>
-#include "gtk2compat.h"
 #else
 #include <gtk/gtkunixprint.h>
 #endif
diff --git a/widget/gtk2/nsScreenGtk.cpp b/widget/gtk2/nsScreenGtk.cpp
index 31545e50f7c4..9332b2f1671a 100644
--- a/widget/gtk2/nsScreenGtk.cpp
+++ b/widget/gtk2/nsScreenGtk.cpp
@@ -11,9 +11,6 @@
 #include <X11/Xatom.h>
 #endif
 #include <gtk/gtk.h>
-#if (MOZ_WIDGET_GTK == 2)
-#include "gtk2compat.h"
-#endif
 
 nsScreenGtk :: nsScreenGtk (  )
   : mScreenNum(0),
diff --git a/widget/gtk2/nsWindow.cpp b/widget/gtk2/nsWindow.cpp
index c37cadece65c..c3dd1813da84 100644
--- a/widget/gtk2/nsWindow.cpp
+++ b/widget/gtk2/nsWindow.cpp
@@ -53,10 +53,6 @@
 #include <gtk/gtkprivate.h>
 #endif
 
-#if defined(MOZ_WIDGET_GTK2)
-#include "gtk2compat.h"
-#endif
-
 #include "nsGkAtoms.h"
 
 #ifdef MOZ_ENABLE_STARTUP_NOTIFICATION