--- a/configure.ac
+++ b/configure.ac
@@ -84,9 +84,9 @@ YELP_HELP_INIT
 # MATE Libs
 # **********
 
-GLIB_REQUIRED=2.50.0
-GIO_REQUIRED=2.50.0
-GTK_REQUIRED=3.22.0
+GLIB_REQUIRED=2.48.0
+GIO_REQUIRED=2.48.0
+GTK_REQUIRED=3.20.0
 MATE_DESKTOP_REQUIRED=1.17.0
 GDKPIXBUF_REQUIRED=2.30.0
 SHARED_MIME_INFO_REQUIRED=0.20
--- a/src/eom-scroll-view.c
+++ b/src/eom-scroll-view.c
@@ -2146,8 +2146,14 @@ view_on_button_press_event_cb (GtkWidget
     /* Ignore double-clicks and triple-clicks */
     if (event->button == 3 && event->type == GDK_BUTTON_PRESS)
     {
+#if GTK_CHECK_VERSION (3, 22, 0)
 	    gtk_menu_popup_at_pointer (GTK_MENU (view->priv->menu),
 	                               (const GdkEvent*) event);
+#else
+	    gtk_menu_popup (GTK_MENU (view->priv->menu),
+	                    NULL, NULL, NULL, NULL,
+	                    event->button, event->time);
+#endif
 
 	    return TRUE;
     }
--- a/src/eom-thumb-view.c
+++ b/src/eom-thumb-view.c
@@ -1063,6 +1063,12 @@ eom_thumb_view_popup_menu (EomThumbView
 {
 	g_return_if_fail (event != NULL);
 
+#if GTK_CHECK_VERSION (3, 22, 0)
 	gtk_menu_popup_at_pointer (GTK_MENU (thumbview->priv->menu),
 	                           (const GdkEvent*) event);
+#else
+	gtk_menu_popup (GTK_MENU (thumbview->priv->menu),
+	                NULL, NULL, NULL, NULL,
+	                event->button, event->time);
+#endif
 }
--- a/src/eom-util.c
+++ b/src/eom-util.c
@@ -53,7 +53,11 @@ eom_util_show_help (const gchar *section
 	if (section)
 		uri = g_strdup_printf ("help:eom/%s", section);
 
+#if GTK_CHECK_VERSION (3, 22, 0)
 	gtk_show_uri_on_window (parent, ((uri != NULL) ? uri : "help:eom"),
+#else
+	gtk_show_uri (NULL, ((uri != NULL) ? uri : "help:eom"),
+#endif
 		      gtk_get_current_event_time (), &error);
 
 	g_free (uri);
--- a/src/eom-window.c
+++ b/src/eom-window.c
@@ -1198,9 +1198,16 @@ eom_window_obtain_desired_size (EomImage
 	screen = gtk_window_get_screen (GTK_WINDOW (window));
 	display = gdk_screen_get_display (screen);
 
+#if GTK_CHECK_VERSION (3, 22, 0)
 	gdk_monitor_get_geometry (gdk_display_get_monitor_at_window (display,
 								     gtk_widget_get_window (GTK_WIDGET (window))),
 				  &monitor);
+#else
+	gdk_screen_get_monitor_geometry (screen,
+	                                 gdk_screen_get_monitor_at_window (screen,
+	                                                                   gtk_window_get_window (GTK_WINDOW (window))),
+	                                 &monitor);
+#endif
 
 	screen_width  = monitor.width;
 	screen_height = monitor.height;
@@ -1649,9 +1656,16 @@ eom_window_update_fullscreen_popup (EomW
 	screen = gtk_widget_get_screen (GTK_WIDGET (window));
 	display = gdk_screen_get_display (screen);
 
+#if GTK_CHECK_VERSION (3, 22, 0)
 	gdk_monitor_get_geometry (gdk_display_get_monitor_at_window (display,
 								     gtk_widget_get_window (GTK_WIDGET (window))),
 				  &screen_rect);
+#else
+	gdk_screen_get_monitor_geometry (screen,
+	                                 gdk_screen_get_monitor_at_window(screen,
+	                                                                  gtk_widget_get_window (GTK_WIDGET (window))),
+	                                 &screen_rect);
+#endif
 
 	gtk_widget_set_size_request (popup,
 				     screen_rect.width,