Unfinished
I plan to explain how to build it under windows when I have time
cygwin-cygwin
If we are going to use cygwin-python there are almost no problems. Download pari, ./Configure -prefix=/usr, make all, make install, download pari-python, python setup.py build, python setup.py install
One more thing must be done - libpari.dll must be copied from /lib to /bin, otherwise python cannot find it.
cygwin-win
We want to use windows python, cygwin pari.
We are trying to follow these instructions:
http://www.python.org/doc/2.4.1/inst/tweak-flags.html