simple build system for personal repos?

[Michael Cronenworth]

Jesse Keating wrote:
> The major hurdle of having koji make use of repos of packages external
> to it has been cleared though, that work went into koji recently.

I can verify this works. Today I successfully built a custom RPM that is 
completely proprietary software using Koji installed on a local server 
that points to an external Fedora and Fedora-updates repo. The external 
repos just happen to also live on the same local server.