After upgrading to Mac OS X 10.7 (Lion) GM I experienced an issue with Mercurial. The command line tool hg seemed not to work any longer: tobias:~ $ hg abort: couldn’t find mercurial libraries in [ /usr/platlib/Library/Python/2.6/site-packages /usr/local/bin /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7 ...] (check your install and PYTHONPATH) Indeed, updated paths to the Python frameworks in 10.7 [...]