diff -Nur -x '*.orig' -x '*~' system-config-printer-1.3.11+20120807/asyncconn.py system-config-printer-1.3.11+20120807.new/asyncconn.py
--- system-config-printer-1.3.11+20120807/asyncconn.py	2012-08-07 19:05:23.000000000 +0200
+++ system-config-printer-1.3.11+20120807.new/asyncconn.py	2012-09-12 16:02:56.862696088 +0200
@@ -20,12 +20,8 @@
 
 import cups
 import gobject
-import gtk
 import os
 
-import asyncipp
-import asyncpk1
-import authconn
 import config
 from debug import *
 import debug
@@ -130,6 +126,7 @@
 
         if use_pk and try_as_root:
             debugprint ("Using polkit-1 connection class")
+            import asyncpk1
             c = asyncpk1.PK1Connection (reply_handler=subst_reply_handler,
                                         error_handler=subst_error_handler,
                                         host=host, port=port,
@@ -138,6 +135,7 @@
             self._conn = c
         else:
             debugprint ("Using IPP connection class")
+            import asyncipp
             c = asyncipp.IPPAuthConnection (reply_handler=subst_reply_handler,
                                             error_handler=subst_error_handler,
                                             auth_handler=subst_auth_handler,
diff -Nur -x '*.orig' -x '*~' system-config-printer-1.3.11+20120807/asyncpk1.py system-config-printer-1.3.11+20120807.new/asyncpk1.py
--- system-config-printer-1.3.11+20120807/asyncpk1.py	2012-08-07 19:05:23.000000000 +0200
+++ system-config-printer-1.3.11+20120807.new/asyncpk1.py	2012-09-12 16:03:02.470696268 +0200
@@ -21,7 +21,10 @@
 import cups
 import dbus
 import gobject
-import gtk
+try:
+    import gtk
+except:
+    pass
 import os
 import sys
 import tempfile
@@ -102,9 +105,15 @@
             return
 
         if str (error) == '':
-            gtk.gdk.threads_enter ()
+            try:
+                gtk.gdk.threads_enter ()
+            except:
+                pass
             self._client_reply_handler (self._conn, self._unpack_fn (*args))
-            gtk.gdk.threads_leave ()
+            try:
+                gtk.gdk.threads_leave ()
+            except:
+                pass
             self._destroy ()
             return
 
@@ -117,9 +126,15 @@
 
         if exc.get_dbus_name () == CUPS_PK_NEED_AUTH:
             exc = cups.IPPError (cups.IPP_NOT_AUTHORIZED, 'pkcancel')
-            gtk.gdk.threads_enter ()
+            try:
+                gtk.gdk.threads_enter ()
+            except:
+                pass
             self._client_error_handler (self._conn, exc)
-            gtk.gdk.threads_leave ()
+            try:
+                gtk.gdk.threads_leave ()
+            except:
+                pass
             self._destroy ()
             return