Si, previamente habia bajado este:
http://apt.sw.be/redhat/el5/en/i386/...l5.rf.i386.rpm
en etc/yum.repos.d tengo un repositorio llamado rpmforge.repo con este contenido:
# Name: RPMforge RPM Repository for Red Hat Enterprise 5 - dag
# URL:
http://rpmforge.net/
[rpmforge]
name = Red Hat Enterprise $releasever - RPMforge.net - dag
#baseurl = http://apt.sw.be/redhat/el5/en/$basearch/dag
mirrorlist =
http://apt.sw.be/redhat/el5/en/mirrors-rpmforge
#mirrorlist = file:///etc/yum.repos.d/mirrors-rpmforge
enabled = 1
protect = 0
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag
gpgcheck = 1