Try using find links instead of our pypi mirror.

scripts/update/update.py

@@ -23,8 +23,8 @@ def create_virtualenv(ctx):
 
         ctx.local("rm -f %s/lib64 && ln -s ./lib %s/lib64" % (venv, venv))
 
-        ctx.local("%s/bin/pip install --exists-action=w --no-deps --download-cache=/tmp/pip-cache -i %s -r %s/requirements/prod.txt" %
-                    (venv, settings.PYPI_MIRROR, settings.SRC_DIR))
+        ctx.local("%s/bin/pip install --exists-action=w --no-deps --download-cache=/tmp/pip-cache -f %s -r %s/requirements/prod.txt" %
+                    (venv, settings.PYREPO, settings.SRC_DIR))
     finally:
         # make sure this always runs
         ctx.local("rm -f %s/lib/python2.6/no-global-site-packages.txt" % venv)