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Haskell is a pure functional language.

Haskell Packaging

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

Debian Haskell

Haskell Collaborative Maintenance information -- start here
Haskell Policy
debian-haskell mailing list
Another example of how to package a Haskell library using dh_haskell
A blog post about packaging Haskell
#debian-haskell IRC channel on OFTC
Ubuntu wiki page