--- a/mixins.py	Wed Jan 27 11:15:32 2010 +0100
+++ b/mixins.py	Wed Jan 27 14:12:09 2010 +0100
@@ -8,6 +8,8 @@
 """
 __docformat__ = "restructuredtext en"
 
+from itertools import chain
+
 from logilab.common.deprecation import deprecated
 from logilab.common.decorators import cached