Can't install unittest components

[geowurster]

(venv)Captain:kmltrack kwurster$ pip install -e .[test]
Obtaining file:///Users/kwurster/github/kmltrack
Requirement already satisfied (use --upgrade to upgrade): python-dateutil in ./venv/lib/python2.7/site-packages (from kmltrack==0.0.5)
Collecting elementtree>=1.2.6 (from kmltrack==0.0.5)
  Could not find a version that satisfies the requirement elementtree>=1.2.6 (from kmltrack==0.0.5) (from versions: )
  Some externally hosted files were ignored as access to them may be unreliable (use --allow-external elementtree to allow).
  No matching distribution found for elementtree>=1.2.6 (from kmltrack==0.0.5)

[redhog]

You have a too new version of pip. Please follow the instructions given by pip and add "--allow-external elementtree" to the command line.