leksah software package provides haskell editor - GHC interface, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install leksah
leksah is installed in your system.
Make ensure the leksah package were installed using the commands given below,
$ sudo dpkg-query -l | grep leksah *
You will get with leksah package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Haskell |
| Package | leksah |
| Version | 0.12.1.3-6+b1 [s390x], 0.12.1. |
| Description | haskell editor - GHC interface |
| Sub Section | Haskell |