libghc-ltk-dev software package provides Leksah Toolkit, 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-ltk-dev
libghc-ltk-dev is installed in your system.
Make ensure the libghc-ltk-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libghc-ltk-dev *
You will get with libghc-ltk-dev package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Haskell |
| Package | libghc-ltk-dev |
| Version | 0.12.0.0-2+b1 [amd64, i386, po |
| Description | Leksah Toolkit |
| Sub Section | Haskell |