[Victor]

> How can we fix the buildbot? Add #ifdef in mathmodule.c to implement the special cases, but only on AIX? Skip the test?

I'm not super-keen on using #ifdefs to implement the special-case handling _just_ for AIX: that opens the door to a labyrinth of #ifdef'ery working around various different problems on various different platforms. If we're going to handle special cases ourselves, let's do it for all platforms.

But I'd also be fine with skipping the test (just on AIX, of course) for now. If we can also find a way to remind ourselves to revisit once the upstream bug has been fixed, so much the better.