$ sudo apt-get update
$ sudo apt-get install fedmsg-irc 

fedmsg-irc is installed in your system.

Make ensure the fedmsg-irc package were installed using the commands given below,

$ sudo dpkg-query -l | grep fedmsg-irc *

You will get with fedmsg-irc package name, version, architecture and description in a table

fedmsg-irc package basic information: