libghc-contravariant-dev software package provides Haskell 98 contravariant functors, 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-contravariant-dev
libghc-contravariant-dev is installed in your system.
Make ensure the libghc-contravariant-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libghc-contravariant-dev *
You will get with libghc-contravariant-dev package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Haskell |
| Package | libghc-contravariant-dev |
| Version | 0.6.1.1-1+b1 [s390x], 0.6.1.1- |
| Description | Haskell 98 contravariant functors |
| Sub Section | Haskell |
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