Index: manuel-1.12.4/src/manuel/doctest.py
===================================================================
--- manuel-1.12.4.orig/src/manuel/doctest.py
+++ manuel-1.12.4/src/manuel/doctest.py
@@ -3,13 +3,13 @@ from __future__ import absolute_import
 import doctest
 import manuel
 import os.path
-import six
+import io
 
 DocTestRunner = doctest.DocTestRunner
 DebugRunner = doctest.DebugRunner
 
 
-class DocTestResult(six.StringIO):
+class DocTestResult(io.StringIO):
     pass