Gentoo Linux has fairly good support for Haskell.
You can check the currently available versions of packages:
There is support for most packages on several architectures: x86, amd64, sparc, ppc and ppc64. There is support for some packages on alpha and hppa.
Support and Bugs:
- Bugs should be reported in the Gentoo bugzilla: http://bugs.gentoo.org/
- There is a #gentoo-haskell irc channel on freenode.net for people interested in developing and testing haskell-related ebuilds.
Filing bugs can also be used to ask for new packages or new versions of existing packages. We would like to encourage users to suggest any packages they feel are useful but are currently not included in portage (though note that we generally only package released versions of software where there are tarballs available and where there is an expectation that the software will be maintained).