libghc-x509-dev software package provides X.509 reader and writer, 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-x509-dev
libghc-x509-dev is installed in your system.
Make ensure the libghc-x509-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libghc-x509-dev *
You will get with libghc-x509-dev package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Haskell |
| Package | libghc-x509-dev |
| Version | 1.4.11-1+b4 [s390x], 1.4.11-1+ |
| Description | X.509 reader and writer |
| Sub Section | Haskell |