ghc6 software package provides transitional dummy package, 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 ghc6
ghc6 is installed in your system.
Make ensure the ghc6 package were installed using the commands given below,
$ sudo dpkg-query -l | grep ghc6 *
You will get with ghc6 package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Haskell |
| Package | ghc6 |
| Version | 7.4.1-4 |
| Description | transitional dummy package |
| Sub Section | Haskell |