Ok, I setup the jenkins build server to now work for Mac OS X 10.4, 10.5, and 10.6. I figured out how to get a single job to build on all three:
https://160.79.59.149:8443/job/pure-data/
IOhannes, if you want do this for Gem, you'll have to create a new Job as a "multi-configuration project". You could probably start by cloning the pure-data job, then copying the build script from the Gem job.
I think I also got the email server setup working.
.hc
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The arc of history bends towards justice. - Dr. Martin Luther King, Jr.