Mapnik python bindings on OS 10.5 should not install in /System

[springmeyer]

The default site-packages directory that mapnik installs in is actually a symlink into /System folders, - which is non-standard and bad practice.

This is the location mapnik installs in:

/usr/lib/python2.5/site-packages/mapnik

and this location is actually in /System:

$ ls -l /usr/lib/python2.5
lrwxr-xr-x  1 root  wheel  75 Nov 15  2007 /usr/lib/python2.5 -> ../../System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5

I've not seen any other python packages installed in this location on OS 10.5.

The more standard location would be:

/Library/Python/2.5/site-packages

Which is also automatically on a vanilla OSX user's PYTHONPATH.

[springmeyer]

A fix should also deal with Ticket #48 at the same time, which is related to the PYTHON_PREFIX ( http://trac.mapnik.org/browser/trunk/SConstruct#L242) being determined by the sys.prefix.

[springmeyer]

Patch to allow mapnik to confirm to the mac osx site-packages standard install location

[springmeyer]

jbronn pointed out that this problem only happens with mapnik built with the leopard system python.

[springmeyer]

look related to Ticket #33

http://trac.mapnik.org/attachment/ticket/33/mapnik_scons_x86_64.2.patch