Thanks for the SO link and thanks for the fix.
Workaround for broken osx native package building.
Review Request #157 — Created March 28, 2014 and submitted
Workaround for broken osx native package building. This prevents errors when building, e.g., psutil and coverage. Hopefully Apple will fix the underlying problem before the ability to shush this error is taken away. See http://bit.ly/1fBkB1T for details. Also make related error messages a bit clearer.