Fabio, Within the last few months you committed the following change to zope.i18nmessageid: http://svn.zope.org/zope.i18nmessageid/trunk/setup.py?rev=102497&r1=101297&r... The commit message is "Fixed the compilation of the C extension with python 2.6: refactored it as a setuptools Feature." Can I ask what problem was being fixed with this commit? It undid work I did in this revision: http://svn.zope.org/zope.i18nmessageid/trunk/setup.py?rev=99669&r1=97948&r2=... I should have left a comment in there: the work was effectively there to support building zope.i18nmessageid on Jython and other platforms like GAE that do not support C extensions at all, even optionally. The package no longer builds on Jython ("error: Setup script exited with error: Compiling extensions is not supported on Jython"), although to be honest I don't really understand why not. I'm hoping we can find a way to retain whatever fix you were trying to make but still allow the package to build on Jython, but I think I need to understand what problem you were fixing first. - C