I just found this report of build failures on the Debian mailing list -- I had not seen these before. I managed to reproduce it on a Power7 machine, and found the fix.
I see that the issue came up when I switched the ranged moebius return value from an IV* (long *) to char*. On every other machine, char is being treated as signed. On these platforms it is unsigned (which they technically may do). I switched to explicit signed char and that seems to have fixed it. I'll get a release out next week. Dana Jacobsen
