--- a/cubicweb.spec	Wed Sep 16 11:32:09 2015 +0200
+++ b/cubicweb.spec	Wed Sep 16 14:45:15 2015 +0200
@@ -20,6 +20,7 @@
 BuildArch:      noarch
 
 Requires:       %{python}
+Requires:       %{python}-six >= 1.4.0
 Requires:       %{python}-logilab-common >= 0.63.1
 Requires:       %{python}-logilab-mtconverter >= 0.8.0
 Requires:       %{python}-rql >= 0.31.2