Hi,
The trace of the problem during installation of "the deb packet"
described by benoit was caused by new version of zc.buildout (1.5.0) look
at http://pypi.python.org/pypi/zc.buildout/1.5.0#problems . I fixed it
on http://www.raskon.org/hg/debs/erp5-buildout/rev/e8c15c4ac41d
Best regards,
Boris Kocherov.