after `sudo pip install pbr` to install pbr into system, problem gone. i try to run tox with (.venv) activated, but pbr-0.5.21-py2.7.egg still install under root dir.
after `sudo pip install pbr` to install pbr into system, problem gone. i try to run tox with (.venv) activated, but pbr-0.5. 21-py2. 7.egg still install under root dir.