diff -r 180aa08cad48 -r 73c1c9cf6bda debian/control
--- a/debian/control	Wed Sep 16 11:32:09 2015 +0200
+++ b/debian/control	Wed Sep 16 14:45:15 2015 +0200
@@ -10,6 +10,7 @@
 Build-Depends:
  debhelper (>= 7),
  python (>= 2.6),
+ python-six (>= 1.4.0),
  python-sphinx,
  python-logilab-common,
  python-unittest2 | python (>= 2.7),
@@ -155,6 +156,7 @@
  ${python:Depends},
  graphviz,
  gettext,
+ python-six (>= 1.4.0),
  python-logilab-mtconverter (>= 0.8.0),
  python-logilab-common (>= 0.63.1),
  python-markdown,