python setup.py build 32-bits on x86_64 machine

[Sérgio Monteiro Basto]

Hi,
I am in x86_64 arch , but I need 
compile things on 32 bits.
python setup.py build

Can't change the fact that distutils creates x86_64 
directories:
gcc -pthread -shared build/temp.linux-x86_64-2.3/ 

Also if I try with a python compile in 32bits and installed 
in system .

how I force distutils build to 32-bits ? 

Thanks in advance,