I have set up some jenkins build servers on some of the PdLab machines, in particular the Mac OS X 10.5-i386 machine, and some others. Would you like to manage nightly builds of Gem on Jenkins? I can give logins to Jenkins' build interface, then you can freely setup and change your own builds directly from git.
If this proves a good solution for Pd, then we could roll out a full on Jenkins infrastructure, with a single Jenkins server with slaves running on many other platforms.
.hc
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¡El pueblo unido jamás será vencido!