[issue8406] Make some setup.py paths exclude-able

[Skip Montanaro]

Skip Montanaro <skip at pobox.com> added the comment:

The patches referenced in issue7713 just unconditionally delete certain
directories from the search path(s).  This patch (now attached) allows
the user to control that.  I presume, for instance, if the MacPorts
folks don't want /usr/X11/... in search paths that they don't have
/usr/X11/bin in PATH when they build Python.  This concept can be
extended to other such directories.  I was mostly concerned about the
Fink and MacPorts directories since they came up in the thread on
python-dev.

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<http://bugs.python.org/issue8406>
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