Builds on EPEL 5 fail with:
{{{
DEBUG util.py:257: Error Downloading Packages:
DEBUG util.py:257: 2:vim-minimal-7.0.109-7.el5.ppc: failed to retrieve vim-minimal-7.0.109-7.el5.ppc.rpm from build
DEBUG util.py:257: error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
DEBUG util.py:257: m2crypto-0.16-8.el5.ppc: failed to retrieve m2crypto-0.16-8.el5.ppc.rpm from build
DEBUG util.py:257: error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
DEBUG util.py:347: Child returncode was: 1
}}}

The latest src packages for these packages in RHEL 5 are vim-7.0.109-7.2.el5.src.rpm and m2crypto-0.16-9.el5.src.rpm, so it seem like the buildroot is trying to use old packages.