libghc-xmonad-dev software package provides Lightweight X11 window manager; libraries, 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-xmonad-dev
libghc-xmonad-dev is installed in your system.
Make ensure the libghc-xmonad-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libghc-xmonad-dev *
You will get with libghc-xmonad-dev package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Haskell |
| Package | libghc-xmonad-dev |
| Version | 0.10-4+b2 [amd64, armhf, i386, |
| Description | Lightweight X11 window manager; libraries |
| Sub Section | Haskell |