I have some bad news – I don’t think the build environment I have for Mac is fixable, so I’ll probably need to rebuild it altogether. What I’m going to try is to get a Mac VM going, so that I have a better source of libraries and things for the cross-compiler, but this may take a few days.
If you’re willing to help out with testing (once there’s some testing to do), would it be possible for you to hang out on the IRC? We don’t seem to have anyone with a Mac on there, which is why this issue has gone undetected for as long as it has.