You can uninstall or removes an installed libircclient-dev package itself from Debian 8 (Jessie) through the terminal,
$ sudo apt-get remove libircclient-dev
If you would like to remove libircclient-dev and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libircclient-dev
If you use with purge options to libircclient-dev package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libircclient-dev
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove libircclient-dev