Comment 3 for bug 931131

I had hoped to enhance the recipe builder so that the recipe itself was run before handing the work off to the build farm. It would then compare the manifest to previous successful builds, and if any matched, it would abandon the job. I suppose checking the version number at this time would also make sense.

Aborting builds on the build farm is better than nothing, but waiting until the build starts to determine that it can't succeed seems perverse.