diff -up system-config-printer-1.4.1/system-config-printer.py.gtk3 system-config-printer-1.4.1/system-config-printer.py
--- system-config-printer-1.4.1/system-config-printer.py.gtk3	2017-11-03 09:48:40.821871880 +0100
+++ system-config-printer-1.4.1/system-config-printer.py	2017-11-03 09:50:06.977237581 +0100
@@ -27,9 +27,11 @@ import config
 import sys, os, time, re
 import thread
 import dbus
+import gi
 from gi.repository import GdkPixbuf
 try:
     from gi.repository import Gdk
+    gi.require_version('Gtk', '3.0')
     from gi.repository import Gtk
     Gtk.init (sys.argv)
 except RuntimeError, e: