https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/ht...
Can you tell me what you want rebuilt and where I would find it?
http://vault.centos.org/5.8/os/SRPMS/system-config-netboot-0.1.45.1-3.el5.sr...
This SRPM creates both system-config-netboot and system-config-netboot-cmd. I would like to see those available for CentOS6 if you feel it's a useful addition. Otherwise I'd maintain my own.
The only thing CentOS removes that Red Hat includes is things that specifically are RHN centric. We don't build those for obvious reasons.
Sure, I understand that. But these packages have been removed by upstream. They are no longer included after EL5.