title: virtualenv command not found after installed with MacPorts
body: <p>I have python 2.7 installed via mac ports on a mac. I installed virtualenv via macports (py27-virtualenv @1.6.1_0 (active). When issue the command: virtualenv demo_venv --no-site-packages, I get this error: -bash: virtualenv:command not found. It's not picking virtualenv up @ all, so do I need to symlink it to my python27 location? </p>