libghc-ghc-mtl-dev software package provides an mtl compatible version of the Ghc-Api monads, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libghc-ghc-mtl-dev
libghc-ghc-mtl-dev is installed in your system.
Make ensure the libghc-ghc-mtl-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libghc-ghc-mtl-dev *
You will get with libghc-ghc-mtl-dev package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Haskell |
| Package | libghc-ghc-mtl-dev |
| Version | 1.0.1.1-1+b3 [amd64, i386, kfr |
| Description | an mtl compatible version of the Ghc-Api monads |
| Sub Section | Haskell |