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Rev 2eef39 adds -d32/-d64 flags to the JRuby build process. ant is choking on that on a PPC running Leopard for some reason. When I update to master, then manually yank all references to jvm.model out of build.xml, JRuby builds again.
I'm going to investigate adding to the platform checks in build.xml to find the right flags for my platform; I'll add that as a patch here if I'm successful.
Got it! My machine was reporting its os.arch as ppc, while the build script was expecting powerpc. The attached patch adds a check for ppc, and fixes the build problem on my old Leopard laptop. (I've left in the other powerpc check, fearing that removing it will break the build on some other PPC-based platform.)