m2crypto 0.13 doesn't works with python 2.1.3

Hi,

when installing m2crypto 0.13 in python 2.1.3, the tests failed with the
following error:

ImportError: /usr/local/Python-2.1.3/lib/python2.1/site-
packages/M2Crypto/__m2crypto.so: undefined symbol: PyString_FromFormat

I searched in google and found that PyString_FromFormat was introduced in
2.2, so, the prerequisites are wrong: m2crypto doesn't supports python
2.1.3.

I really need to install it because I'm using zope 2.6.4rc2, which depends
on python 2.1.3. Where can I find the latest m2crypto version compatible
with this python version?

Regards,
Josef Meile