--- a/configure.ac
+++ b/configure.ac
@@ -85,9 +85,9 @@ 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/cut-n-paste/toolbar-editor/egg-editable-toolbar.c
+++ b/cut-n-paste/toolbar-editor/egg-editable-toolbar.c
@@ -358,7 +358,12 @@ popup_context_menu_cb (GtkWidget
       menu = GTK_MENU (gtk_ui_manager_get_widget (etoolbar->priv->manager,
 						  etoolbar->priv->popup_path));
       g_return_if_fail (menu != NULL);
+#if GTK_CHECK_VERSION (3, 22, 0)
       gtk_menu_popup_at_pointer (menu, NULL);
+#else
+      gtk_menu_popup (menu, NULL, NULL,
+                      NULL, NULL, button_number, GDK_CURRENT_TIME);
+#endif
       g_signal_connect_object (menu, "selection-done",
 			       G_CALLBACK (popup_context_deactivate),
 			       etoolbar, 0);
@@ -380,7 +385,12 @@ button_press_event_cb (GtkWidget *widget
       menu = GTK_MENU (gtk_ui_manager_get_widget (etoolbar->priv->manager,
 						  etoolbar->priv->popup_path));
       g_return_val_if_fail (menu != NULL, FALSE);
+#if GTK_CHECK_VERSION (3, 22, 0)
       gtk_menu_popup_at_pointer (menu, (const GdkEvent*) event);
+#else
+      gtk_menu_popup (menu, NULL, NULL,
+                      NULL, NULL, event->button, event->time);
+#endif
       g_signal_connect_object (menu, "selection-done",
 			       G_CALLBACK (popup_context_deactivate),
 			       etoolbar, 0);
--- a/data/eom-image-properties-dialog.ui
+++ b/data/eom-image-properties-dialog.ui
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Generated with glade 3.22.1 -->
 <interface>
-  <requires lib="gtk+" version="3.22"/>
+  <requires lib="gtk+" version="3.20"/>
   <template class="EomPropertiesDialog" parent="GtkDialog">
     <property name="can_focus">False</property>
     <property name="border_width">5</property>
--- a/src/eom-properties-dialog.c
+++ b/src/eom-properties-dialog.c
@@ -453,7 +453,12 @@ pd_folder_button_clicked_cb (GtkButton *
 	timestamp = gtk_get_current_event_time ();
 
 	window = GTK_WINDOW (data);
+#if GTK_CHECK_VERSION (3, 22, 0)
 	gtk_show_uri_on_window (window, priv->folder_button_uri, timestamp, NULL);
+#else
+	gtk_show_uri (gtk_window_get_screen (window), priv->folder_button_uri,
+	              timestamp, NULL);
+#endif
 }
 
 static gboolean
--- a/src/eom-scroll-view.c
+++ b/src/eom-scroll-view.c
@@ -2241,8 +2241,14 @@ 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-sidebar.c
+++ b/src/eom-sidebar.c
@@ -218,6 +218,32 @@ eom_sidebar_class_init (EomSidebarClass
 			      GTK_TYPE_WIDGET);
 }
 
+#if !GTK_CHECK_VERSION (3, 22, 0)
+static void
+eom_sidebar_menu_position_under_widget (GtkMenu *menu,
+                                        int     *x,
+                                        int     *y,
+                                        gboolean *push_in,
+                                        gpointer user_data)
+{
+    GtkWidget *widget;
+    GtkAllocation allocation;
+
+    g_return_if_fail (GTK_IS_WIDGET (user_data));
+    g_return_if_fail (!gtk_widget_get_has_window (GTK_WIDGET (user_data)));
+
+    widget = GTK_WIDGET (user_data);
+
+    gdk_window_get_origin (gtk_widget_get_window (widget), x, y);
+    gtk_widget_get_allocation (widget, &allocation);
+
+    *x += allocation.x;
+    *y += allocation.y + allocation.height;
+
+    *push_in = FALSE;
+}
+#endif
+
 static gboolean
 eom_sidebar_select_button_press_cb (GtkWidget      *widget,
 				    GdkEventButton *event,
@@ -241,11 +267,17 @@ eom_sidebar_select_button_press_cb (GtkW
 
 		gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (widget), TRUE);
 
+#if GTK_CHECK_VERSION (3, 22, 0)
 		gtk_menu_popup_at_widget (GTK_MENU (eom_sidebar->priv->menu),
 		                          widget,
 		                          GDK_GRAVITY_SOUTH_WEST,
 		                          GDK_GRAVITY_NORTH_WEST,
 		                          (const GdkEvent*) event);
+#else
+		gtk_menu_popup (GTK_MENU (eom_sidebar->priv->menu), NULL, NULL,
+		                eom_sidebar_menu_position_under_widget, widget,
+		                event->button, event->time);
+#endif
 
 		return TRUE;
 	}
@@ -266,11 +298,17 @@ eom_sidebar_select_button_key_press_cb (
 	    event->keyval == GDK_KEY_KP_Enter) {
 		gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (widget), TRUE);
 
+#if GTK_CHECK_VERSION (3, 22, 0)
 		gtk_menu_popup_at_widget (GTK_MENU (eom_sidebar->priv->menu),
 		                          widget,
 		                          GDK_GRAVITY_SOUTH_WEST,
 		                          GDK_GRAVITY_NORTH_WEST,
 		                          (const GdkEvent*) event);
+#else
+		gtk_menu_popup (GTK_MENU (eom_sidebar->priv->menu), NULL, NULL,
+		                eom_sidebar_menu_position_under_widget, widget,
+				GDK_BUTTON_PRIMARY, event->time);
+#endif
 
 		return TRUE;
 	}
--- a/src/eom-thumb-view.c
+++ b/src/eom-thumb-view.c
@@ -1062,6 +1062,11 @@ 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);
@@ -362,7 +366,12 @@ _eom_util_show_file_in_filemanager_fallb
 		g_object_unref (parent_file);
 	}
 
+#if GTK_CHECK_VERSION (3, 22, 0)
 	if (uri && !gtk_show_uri_on_window (toplevel, uri, timestamp, &error)) {
+#else
+	if (uri && !gtk_show_uri (gtk_window_get_screen (toplevel), uri,
+	                          timestamp, &error)) {
+#endif
 		g_warning ("Couldn't show containing folder \"%s\": %s", uri,
 			   error->message);
 		g_error_free (error);
--- a/src/eom-window.c
+++ b/src/eom-window.c
@@ -1200,9 +1200,16 @@ 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_widget_get_window (GTK_WIDGET (window))),
+	                                 &monitor);
+#endif
 
 	screen_width  = monitor.width;
 	screen_height = monitor.height;
@@ -1651,9 +1658,16 @@ 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,