libghc-src-exts-dev software package provides Haskell-Source with eXtensions library for GHC, 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 libghc-src-exts-dev
libghc-src-exts-dev is installed in your system.
Make ensure the libghc-src-exts-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libghc-src-exts-dev *
You will get with libghc-src-exts-dev package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Haskell |
| Package | libghc-src-exts-dev |
| Version | 1.14.0.1-4 |
| Description | Haskell-Source with eXtensions library for GHC |
| Sub Section | Haskell |