[NullSet]

The problem with packages and Haskell is well known; there are a few camps currently trying to solve the issue. Personally, (although the author went about things in a rather roundabout way) I can feel for the author. I LOVE Haskell, I cannot think of a better language for prototyping crazy ideas in and I work in it every chance that I get; that being said, its awful to get up and running with cabal. The suggestion which has been posed to me is "simply use cabal-dev", when I do this, I wind up with crazy huge project files because of repeat installs. I sincerely hope that someone much smarter than myself can come up with a solution for this; I think it is a primary reason why Haskell is not being more widely adopted.

References(for those who are interested) http://www.yesodweb.com/blog/2012/04/replacing-cabal http://www.yesodweb.com/blog/2012/03/cabal-nirvana

Hopefully the guys at FP complete will redirect some of their focus onto this (please oh please). http://fpcomplete.com/