sys env : win xp + python2.5 + mingw32 . run "python setup.py build -c mingw32 " ,error:ValueError: invalid version number '2.20.51.20100613'

[qihangzp]

system env:
winxp
python2.5
mingw32
problem:
Few weeks ago,I installed amfast successfully with sys-
env:winxp,python2.6,mingw32.Now,I need my app run on the GAE,so I have
to work with python2.5.But,when I setup Amfast with command "python
setup.py build -c mingw32 ", sys give me a "version error":
raise ValueError, "invalid version number '%s'" % vstring
ValueError: invalid version number '2.20.51.20100613'

I have re-installed mingw32 for serval times,but it didn't work.
I noticed that ,in url:http://code.google.com/p/amfast/wiki/
Faq#How_do_I_get_the_encoder/decoder_extensions_to_compile_in_Window
Comment by nootropic.kint, May 26, 2009
have a same problem.

need help~