Hey guys,

Just add:

    if os.path.exists('/etc/arch-release'):
        distname = 'arch'

in "_dist_try_harder"

then replace the old list with this one:

_supported_dists = (
    'SuSE', 'debian', 'fedora', 'redhat', 'centos',
    'mandrake', 'mandriva', 'rocks', 'slackware', 'yellowdog', 'gentoo',
    'UnitedLinux', 'turbolinux', 'arch')

And that's it, it works.