[root@edouard ~]# dnf info steam
Using metadata from Mon May 25 07:59:45 2015 (2 days, 0:32:31 hours old)
Paquets disponibles
Nom : steam
Architectur : i686
Époque : 0
Version : 1.0.0.50
Révision : 1.fc21
Taille : 2.6 M
Dépôt : rpmfusion-nonfree-updates
Résumé : Installer for the Steam software distribution service
URL : http://www.steampowered.com/
Licence : Steam License Agreement
Description : Installer for the Steam software distribution service.
: Steam is a software distribution service with an online store, automated
: installation, automatic updates, achievements, SteamCloud synchronized
: savegame and screenshot functionality, and many social features.
il est dans le dépot nonfree, celui ci est désactivé sur ta machine. active rpmfusion-nonfree et rpmfusion-nonfree-updates