安装软件库error,need system-release包,but找不到

v55643

[root@localhost ~]# rpm -ivh http://download1.rpmfusion.org/free/fedora/rpmfusio n-free-release-stable.noarch.rpm
Retrieving http://download1.rpmfusion.org/f ... on-free-release-sta ble.noarch.rpm
warning: /var/tmp/rpm-xfer.sY3Kop: Header V3 DSA signature: NOKEY, key ID 49c888 5a
error: Failed dependencies:
        system-release >= 10 is needed by rpmfusion-free-release-10-5.noarch
[root@localhost ~]#
到底是个什么包，找不到啊
系统Fedora12
才装的，
烦请帮助

pingz

http://rpmfusion.org/Configuration
http://rpmfusion.org/keys