[http://www.haskell.org/ Haskell] is a pure functional language.

Haskell Packaging

http://www.haskell.org/cabal/

Debian Haskell

[http://urchin.earth.li/~ian/haskell-policy/ Haskell Policy]
[http://lists.debian.org/debian-haskell debian-haskell mailing list]
[http://www.n-heptane.com/nhlab/repos/cabalDebianTemplate/ Another example] of how to package a Haskell library using dh_haskell
[http://pupeno.com/blog-en/the-lambda-revolution-episode-v-the-deb-strikes-back/ A blog post] about packaging Haskell
#debian-haskell IRC channel on OFTC
[https://wiki.ubuntu.com/MOTU/Teams/UncommonProgrammingLanguages/Haskell Ubuntu wiki page]