Comment 2 for bug 71914

After many different compilation of python2.5 from ubuntu packages and from original source (python.org), I managed to find the problem: the configuration option --with-system-ffi, which is used by the ubuntu package. If I use this option for original sources of python, I have the same problem.

I don't really understand how libffi is used, so I don't really know how to go further.