just for the record: 
trying to test this on Debian6 gave an error, due to a subtle incompatibility with python/2.7.5 build process which is a dep here.

IMHO, preferring Python/2.7.3 (and other well aligned versions from the `biodeps` set) would give maximum compatibility across many distros/OSes (only bother with this comment if you care about multi-distro scenaria)