mercurial/localrepo.py

--- a/mercurial/localrepo.py	Fri Jul 22 16:46:22 2011 -0500
+++ b/mercurial/localrepo.py	Wed Jul 20 18:23:06 2011 -0400
@@ -63,6 +63,7 @@
                     )
                 if self.ui.configbool('format', 'generaldelta', False):
                     requirements.append("generaldelta")
+                requirements = set(requirements)
             else:
                 raise error.RepoError(_("repository %s not found") % path)
         elif create: