diff --git a/src/auto/configure b/src/auto/configure
index 6dd5bb9..1980a95 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -8997,11 +8997,6 @@
     fi
   fi
   if test "x$GUITYPE" = "xGTK"; then
-    if test "$gtk_minor_version" = 1 -a "0$gtk_micro_version" -ge 1 \
-	|| test "0$gtk_minor_version" -ge 2; then
-      $as_echo "#define HAVE_GTK_MULTIHEAD 1" >>confdefs.h
-
-    fi
                 if test -z "$SKIP_GNOME"; then
     {
 
@@ -9294,8 +9289,6 @@
       SKIP_MOTIF=YES
       GUITYPE=GTK
 
-      $as_echo "#define HAVE_GTK_MULTIHEAD 1" >>confdefs.h
-
       $as_echo "#define USE_GTK3 1" >>confdefs.h
 
     fi
diff --git a/src/config.h.in b/src/config.h.in
index f8a23ed..a934507 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -398,9 +398,6 @@
 /* Define if you use KDE and want KDE Toolbar support. */
 #undef FEAT_KDETOOLBAR
 
-/* Define if GTK+ multihead support is available (requires GTK+ >= 2.1.1). */
-#undef HAVE_GTK_MULTIHEAD
-
 /* Define if your X has own locale library */
 #undef X_LOCALE
 
diff --git a/src/configure.ac b/src/configure.ac
index d424550..1c1b1c7 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -2606,10 +2606,6 @@
     fi
   fi
   if test "x$GUITYPE" = "xGTK"; then
-    if test "$gtk_minor_version" = 1 -a "0$gtk_micro_version" -ge 1 \
-	|| test "0$gtk_minor_version" -ge 2; then
-      AC_DEFINE(HAVE_GTK_MULTIHEAD)
-    fi
     dnl
     dnl if GTK exists, then check for GNOME.
     dnl
@@ -2658,7 +2654,6 @@
       SKIP_MOTIF=YES
       GUITYPE=GTK
       AC_SUBST(GTK_LIBNAME)
-      AC_DEFINE(HAVE_GTK_MULTIHEAD)
       AC_DEFINE(USE_GTK3)
     fi
   fi
diff --git a/src/gui_beval.c b/src/gui_beval.c
index 818a50b..abff1b0 100644
--- a/src/gui_beval.c
+++ b/src/gui_beval.c
@@ -1177,8 +1177,7 @@
 	int		x_offset = EVAL_OFFSET_X;
 	int		y_offset = EVAL_OFFSET_Y;
 	PangoLayout	*layout;
-# ifdef HAVE_GTK_MULTIHEAD
-#  if GTK_CHECK_VERSION(3,22,2)
+# if GTK_CHECK_VERSION(3,22,2)
 	GdkRectangle rect;
 	GdkMonitor * const mon = gdk_display_get_monitor_at_window(
 		gtk_widget_get_display(beval->balloonShell),
@@ -1187,17 +1186,13 @@
 
 	screen_w = rect.width;
 	screen_h = rect.height;
-#  else
+# else
 	GdkScreen	*screen;
 
 	screen = gtk_widget_get_screen(beval->target);
 	gtk_window_set_screen(GTK_WINDOW(beval->balloonShell), screen);
 	screen_w = gdk_screen_get_width(screen);
 	screen_h = gdk_screen_get_height(screen);
-#  endif
-# else
-	screen_w = gdk_screen_width();
-	screen_h = gdk_screen_height();
 # endif
 # if !GTK_CHECK_VERSION(3,0,0)
 	gtk_widget_ensure_style(beval->balloonShell);
diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index c00b3d6..5837c0b 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -102,12 +102,8 @@
 /*
  * Easy-to-use macro for multihead support.
  */
-#ifdef HAVE_GTK_MULTIHEAD
-# define GET_X_ATOM(atom)	gdk_x11_atom_to_xatom_for_display( \
+#define GET_X_ATOM(atom)	gdk_x11_atom_to_xatom_for_display( \
 				    gtk_widget_get_display(gui.mainwin), atom)
-#else
-# define GET_X_ATOM(atom)	((Atom)(atom))
-#endif
 
 /* Selection type distinguishers */
 enum
@@ -2846,7 +2842,7 @@
 	/*
 	 * Cannot handle "XLib-only" windows with gtk event routines, we'll
 	 * have to change the "server" registration to that of the main window
-	 * If we have not registered a name yet, remember the window
+	 * If we have not registered a name yet, remember the window.
 	 */
 # if GTK_CHECK_VERSION(3,0,0)
 	serverChangeRegisteredWindow(GDK_WINDOW_XDISPLAY(mainwin_win),
@@ -2884,16 +2880,14 @@
     char	blank_data[] = { 0x0 };
 #endif
 
-#ifdef HAVE_GTK_MULTIHEAD
-# if GTK_CHECK_VERSION(3,12,0)
+#if GTK_CHECK_VERSION(3,12,0)
     {
 	GdkWindow * const win = gtk_widget_get_window(gui.mainwin);
 	GdkScreen * const scrn = gdk_window_get_screen(win);
 	root_window = gdk_screen_get_root_window(scrn);
     }
-# else
+#else
     root_window = gtk_widget_get_root_window(gui.mainwin);
-# endif
 #endif
 
     /* Create a pseudo blank pointer, which is in fact one pixel by one pixel
@@ -2932,7 +2926,6 @@
     return cursor;
 }
 
-#ifdef HAVE_GTK_MULTIHEAD
     static void
 mainwin_screen_changed_cb(GtkWidget  *widget,
 			  GdkScreen  *previous_screen UNUSED,
@@ -2945,22 +2938,22 @@
      * Recreate the invisible mouse cursor.
      */
     if (gui.blank_pointer != NULL)
-# if GTK_CHECK_VERSION(3,0,0)
+#if GTK_CHECK_VERSION(3,0,0)
 	g_object_unref(G_OBJECT(gui.blank_pointer));
-# else
+#else
 	gdk_cursor_unref(gui.blank_pointer);
-# endif
+#endif
 
     gui.blank_pointer = create_blank_pointer();
 
-# if GTK_CHECK_VERSION(3,0,0)
+#if GTK_CHECK_VERSION(3,0,0)
     if (gui.pointer_hidden && gtk_widget_get_window(gui.drawarea) != NULL)
 	gdk_window_set_cursor(gtk_widget_get_window(gui.drawarea),
 		gui.blank_pointer);
-# else
+#else
     if (gui.pointer_hidden && gui.drawarea->window != NULL)
 	gdk_window_set_cursor(gui.drawarea->window, gui.blank_pointer);
-# endif
+#endif
 
     /*
      * Create a new PangoContext for this screen, and initialize it
@@ -2978,7 +2971,6 @@
 	gui_set_shellsize(FALSE, FALSE, RESIZE_BOTH);
     }
 }
-#endif /* HAVE_GTK_MULTIHEAD */
 
 /*
  * After the drawing area comes up, we calculate all colors and create the
@@ -3907,12 +3899,8 @@
 	GtkWidget *plug;
 
 	/* Use GtkSocket from another app. */
-#ifdef HAVE_GTK_MULTIHEAD
 	plug = gtk_plug_new_for_display(gdk_display_get_default(),
 					gtk_socket_id);
-#else
-	plug = gtk_plug_new(gtk_socket_id);
-#endif
 #if GTK_CHECK_VERSION(3,0,0)
 	if (plug != NULL && gtk_plug_get_socket_window(GTK_PLUG(plug)) != NULL)
 #else
@@ -3972,10 +3960,10 @@
     gtk_signal_connect(GTK_OBJECT(gui.mainwin), "realize",
 		       GTK_SIGNAL_FUNC(&mainwin_realize), NULL);
 #endif
-#ifdef HAVE_GTK_MULTIHEAD
-    g_signal_connect(G_OBJECT(gui.mainwin), "screen_changed",
+
+    g_signal_connect(G_OBJECT(gui.mainwin), "screen-changed",
 		     G_CALLBACK(&mainwin_screen_changed_cb), NULL);
-#endif
+
     gui.accel_group = gtk_accel_group_new();
     gtk_window_add_accel_group(GTK_WINDOW(gui.mainwin), gui.accel_group);
 
@@ -4992,8 +4980,7 @@
     void
 gui_mch_get_screen_dimensions(int *screen_w, int *screen_h)
 {
-#ifdef HAVE_GTK_MULTIHEAD
-# if GTK_CHECK_VERSION(3,22,2)
+#if GTK_CHECK_VERSION(3,22,2)
     GdkRectangle rect;
     GdkMonitor * const mon = gdk_display_get_monitor_at_window(
 	    gtk_widget_get_display(gui.mainwin),
@@ -5001,8 +4988,10 @@
     gdk_monitor_get_geometry(mon, &rect);
 
     *screen_w = rect.width;
+    /* Subtract 'guiheadroom' from the height to allow some room for the
+     * window manager (task list and window title bar). */
     *screen_h = rect.height - p_ghr;
-# else
+#else
     GdkScreen* screen;
 
     if (gui.mainwin != NULL && gtk_widget_has_screen(gui.mainwin))
@@ -5011,13 +5000,9 @@
 	screen = gdk_screen_get_default();
 
     *screen_w = gdk_screen_get_width(screen);
-    *screen_h = gdk_screen_get_height(screen) - p_ghr;
-# endif
-#else
-    *screen_w = gdk_screen_width();
     /* Subtract 'guiheadroom' from the height to allow some room for the
      * window manager (task list and window title bar). */
-    *screen_h = gdk_screen_height() - p_ghr;
+    *screen_h = gdk_screen_get_height(screen) - p_ghr;
 #endif
 
     /*
@@ -6335,23 +6320,19 @@
     void
 gui_mch_beep(void)
 {
-#ifdef HAVE_GTK_MULTIHEAD
     GdkDisplay *display;
 
-# if GTK_CHECK_VERSION(3,0,0)
+#if GTK_CHECK_VERSION(3,0,0)
     if (gui.mainwin != NULL && gtk_widget_get_realized(gui.mainwin))
-# else
+#else
     if (gui.mainwin != NULL && GTK_WIDGET_REALIZED(gui.mainwin))
-# endif
+#endif
 	display = gtk_widget_get_display(gui.mainwin);
     else
 	display = gdk_display_get_default();
 
     if (display != NULL)
 	gdk_display_beep(display);
-#else
-    gdk_beep();
-#endif
 }
 
     void
@@ -6698,16 +6679,12 @@
     void
 gui_mch_flush(void)
 {
-#ifdef HAVE_GTK_MULTIHEAD
-# if GTK_CHECK_VERSION(3,0,0)
+#if GTK_CHECK_VERSION(3,0,0)
     if (gui.mainwin != NULL && gtk_widget_get_realized(gui.mainwin))
-# else
-    if (gui.mainwin != NULL && GTK_WIDGET_REALIZED(gui.mainwin))
-# endif
-	gdk_display_flush(gtk_widget_get_display(gui.mainwin));
 #else
-    gdk_flush(); /* historical misnomer: calls XSync(), not XFlush() */
+    if (gui.mainwin != NULL && GTK_WIDGET_REALIZED(gui.mainwin))
 #endif
+	gdk_display_flush(gtk_widget_get_display(gui.mainwin));
 }
 
 /*
@@ -7298,12 +7275,8 @@
 	    id = mshape_ids[shape];
 	else
 	    return;
-# ifdef HAVE_GTK_MULTIHEAD
 	c = gdk_cursor_new_for_display(
 		gtk_widget_get_display(gui.drawarea), (GdkCursorType)id);
-# else
-	c = gdk_cursor_new((GdkCursorType)id);
-# endif
 # if GTK_CHECK_VERSION(3,0,0)
 	gdk_window_set_cursor(gtk_widget_get_window(gui.drawarea), c);
 # else
diff --git a/src/mbyte.c b/src/mbyte.c
index 7396a7c..71280bd 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -5304,17 +5304,12 @@
 {
     GdkEventKey *event;
 
-#  ifdef HAVE_GTK_MULTIHEAD
     event = (GdkEventKey *)gdk_event_new(GDK_KEY_PRESS);
-#   if GTK_CHECK_VERSION(3,0,0)
+#  if GTK_CHECK_VERSION(3,0,0)
     g_object_ref(gtk_widget_get_window(gui.drawarea));
 					/* unreffed by gdk_event_free() */
-#   else
-    g_object_ref(gui.drawarea->window); /* unreffed by gdk_event_free() */
-#   endif
 #  else
-    event = (GdkEventKey *)g_malloc0((gulong)sizeof(GdkEvent));
-    event->type = GDK_KEY_PRESS;
+    g_object_ref(gui.drawarea->window); /* unreffed by gdk_event_free() */
 #  endif
 #  if GTK_CHECK_VERSION(3,0,0)
     event->window = gtk_widget_get_window(gui.drawarea);
@@ -5337,11 +5332,7 @@
     event->send_event = FALSE;
     gtk_im_context_filter_keypress(xic, event);
 
-#  ifdef HAVE_GTK_MULTIHEAD
     gdk_event_free((GdkEvent *)event);
-#  else
-    g_free(event);
-#  endif
 }
 
     void
diff --git a/src/version.c b/src/version.c
index 3d91495..6e232dc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    620,
+/**/
     619,
 /**/
     618,