libghc6-mtl-dev 1.1.0.0-2 (amd64 binary) in ubuntu karmic

 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.
 .
 MTL is a monad transformer library, inspired by the paper "Functional
 Programming with Overloading and Higher-Order Polymorphism",
 by Mark P Jones (<http://www.cse.ogi.edu/~mpj/>), Advanced School
 of Functional Programming, 1995.