Produits Entr'ouvert » Authentic 2

pip 1.4.1 :

$ pip install authentic2
...
Successfully installed authentic2 django south requests django-registration django-admin-tools django-debug-toolbar sqlparse

but with pip 1.5 :

$ pip install authentic2
...
Downloading/unpacking django-registration==0.8.0final (from authentic2)
  Could not find a version that satisfies the requirement django-registration==0.8.0final (from authentic2) (from versions: 0.7, 0.8, 1.0)
  Some externally hosted files were ignored (use --allow-external to allow).
Cleaning up...
No distributions matching the version for django-registration==0.8.0final (from authentic2)
Storing debug log for failure in /home/thomas/.pip/pip.log

I've tried new pip options (--allow-external, --allow-unverified, --allow-all-external) without success.