alex software package provides lexical analyser generator for Haskell, 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 alex
alex is installed in your system.
Make ensure the alex package were installed using the commands given below,
$ sudo dpkg-query -l | grep alex *
You will get with alex package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Haskell |
| Package | alex |
| Version | 3.1.3-1+b2 [arm64], 3.1.3-1 [a |
| Description | lexical analyser generator for Haskell |
| Sub Section | Haskell |
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