Comment 31 for bug 482993

> as it sets python 2.5 to be the preferred version system-wide

That's not how I read the python man page nor how environement variables work: the scope of using $VERSIONER_PYTHON_VERSION=2.5 is limited to the Inkscape process and inherited by the spawned python preocess, but does not change system preferences:

quoting <http://developer.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man1/python.1.html>:
"This environment variable takes precedence over the preference file settings."