I was a happy user of Ubuntu until a few months ago when GHC 6.10 was released. Ubuntu still had GHC 6.8.2. Posts on haskell-cafe told that Arch Linux had support for latest GHC, and support for over 700 Haskell libraries. Since I had started using Haskell for a few projects, I decided ot check Arch linux out. After a long weekend of struggling through the installation and learning more about linux than I intended to know, I had all my usual programs up and running on Arch. Once I discovered AUR, I had the latest versions of almost everything. Or so I thought.
The first glitch was that Arch does not install the profiling version of the libraries. I asked around on #haskell, and I was told, that I should use cabal to install the profiling version of libraries. I did not want to have conflicting versions of libraries, so I uninstalled a few libs from the Arch repositories, and manually installed them using cabal.
And now I figured out that Haskell libraries are not so up-to-date on AUR. For example, new versions of monte-carlo and gsl-random were released more than a week ago, but AUR still has the old versions. So, I decided to install them using cabal.
After having used Arch for about two months, I am not convinced that it has a good support for Haskell. The only good thing is that it comes with a version of cabal that can upgrade itself. (From what I remember, the ubuntu version of cabal could not upgrade itself, and I had to install cabal by hand). But once cabal is updated, it is much more convenient to use cabal than the Arch repositories. Arch is a great distribution and I like the rolling release philosophy, but its support for Haskell is mediocre at best.
Most programming languages come with their own tools for installing libraries (CPAN for perl, gem for ruby, cabal for Haskell, and now even texlive has a tool for updating packages). I do not think that it is worth the effort to port packages to distribution repositories. Simply using the language’s tool for installing libraries is much simpler and much easier to maintain.