32bit install on 64bit system

[Peter Hartmann]

Hello,
I could really use some help.  I'm trying to install a python program
on centos4 x86_64.  When I run 'python setup.py' it ends up in
/usr/lib64/python2.3/site-packages/  instead of
/usr/lib/python2.3/site-packages.  It's a problem because the program
I'm trying to install is a dependency for something that is only
32bit.  How can I specify a 32bit install?    What I've tried so far: 
When I try 'python setup.py build --build-lib
/usr/lib/python2.3/site-packages'  and  'python setup.py install
--install-lib /usr/lib/python2.3/site-packages', it installs the 64bit
version into the 32bit library.    Can anyone help me?

Thanks,
Peter