I recently combined the packages from two github repositories into a third, and tried to release them to Indigo there.
I must have missed something, because the build farm is still trying to get those packages from their old GBP repositories, instead of the new one.
http://jenkins.ros.org/job/ros-indigo-segbot-simulation-apps_sourcedeb/3/console
The rosdistro distribution appears to have been updated correctly for those packages: