[pygtk] How install pygtk with multiple copies of python ?

[Pluch']

Hello,

On a fresh install of Ubuntu 8.10 (which come with python2.5), I had installed python2.6.
Now I have two directory:
/usr/local/lib/python2.6
/usr/local/include/python2.6
and the file /usr/local/bin/python2..6

I read the FAQ fhttp://faq.pygtk.org/index.py?req=show&file=faq01.010.htp but I can't understand which prefix to use with ./configure.
(for the variable PYTHON, I think I should use /usr/local/bin/python2.6 )

Thanks for any help!