buildgroups directory vanished from http://buildsys.fedoraproject.org ?

[Manuel Wolfshant <wolfy nobugconsulting ro>]

   While trying to test build a program for EL-5, mock bails out with:

INFO: Results and/or logs in: /var/lib/mock//epel-5-x86_64/result
ERROR: Command failed:
# /usr/bin/yum --installroot /var/lib/mock/epel-5-x86_64/root/  install 
buildsys-build
http://buildsys.fedoraproject.org/buildgroups/rhel5/x86_64/repodata/repomd.xml: 
[Errno 14] HTTP Error 404: Not Found
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: 
groups. Please verify its path and try again



   It looks like the buildgroups does not exist any more. Could someone 
please fix it (or tell me what to use instead, if it's gone for good) ?

                   Manuel