Problema con repo de centos

[Juan Andres Ramirez]

Amigos:
    Tengo un problema con los repos de centos, no puedo dar con los
correctos para instalar gcc, rpm-build etc...
    Adjunto centos-base para que me puedan decir que falta.

Gracias.

[base]
name=CentOS-$releasever - Base
#mirrorlist=
http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
baseurl=http://mirror.netglobalis.net/pub/centos/6.2/os/x86_64/
gpgcheck=1
enable=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=6.2=$basearch&repo=updates
baseurl=http://mirror.serversurgeon.com/centos/6.2/updates/x86_64/
gpgcheck=1
enable=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=http://mirror.netglobalis.net/pub/centos/6.2/extras/x86_64/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirror.netglobalis.net/pub/centos/6.2/centosplus/x86_64/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
#mirrorlist=
http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
baseurl=http://mirror.netglobalis.net/pub/centos/6.2/contrib/x86_64/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6