To add additional sites that have RPMs for Linux:
1) Add the site to the yum config file under /etc/yum.conf
Example:
[atrpms]
name=ATrpms for Fedora Core $releasever
baseurl=http://apt.atrpms.net/fedora/$releasever/en/$basearch/at-stable
2) Find the sites public signing key
Example:
rpm --import http://ATrpms.net/RPM-GPG-KEY.atrpms
Now when you do a yum install or update that site is added to sites
searched for RPMs. A note, be very careful with sites that have RPMs at
what's called RPMS.at-bleeding since these tend to be the raw
development builds and can lead to "bad things".....