j'ai fait ce que le court tut a dis c-a-d en root tapper:
yum install xmms-mp3

et ça me donne ça comme erreur
Gathering header information file(s) from server(s)
Server: Fedora Core 2 - i386 - Base
Server: Fedora.us Extras (Stable)
Server: Fedora.us Extras (Testing)
Server: Fedora.us Extras (Unstable)
Server: Livna.org - Fedora Compatible Packages (stable)
Server: Livna.org - Fedora Compatible Packages (testing)
Server: Livna.org - Fedora Compatible Packages (unstable)
Server: macromedia.mplug.org - Flash Plugin
Server: Fedora Core 2 - i386 - Released Updates
Finding updated packages
Downloading needed headers
Damaged Header /var/cache/yum/fedora-unstable/headers/camstream-0-0.26.3-0.fdr.4.2.i386.hdr
camstream-0-0.26.3-0.fdr. 100% |=========================| 2.6 kB 00:00
Damaged Header /var/cache/yum/fedora-unstable/headers/camstream-0-0.26.3-0.fdr.4.2.i386.hdr
retrygrab() failed for:
http://mirrors.usc.edu/pub/linux/fedora/fedora/fedora/2/i386/RPMS.unstable/headers/camstream-0-0.26.3-0.fdr.4.2.i386.hdr
Executing failover method
failover: out of servers to try
Error getting file http://mirrors.usc.edu/pub/linux/fedora/fedora/fedora/2/i386/RPMS.unstable/headers/camstream-0-0.26.3-0.fdr.4.2.i386.hdr
[Errno -1] Header cannot be opened or does not match camstream, i386.
j'ai bien remplacé le fichier yum.conf par celui donné, mais j'ai toujours rien

est-ce que quelqu'un sait ce que je dois faire?
Merchi