I'm not at all sure if this is the right thing to do here, Windows folks. My goal is to be able to detect if we are running on Windows XP when you try to enable THREADSAFE (i.e. GIT_THREADS) and generate a compile-time error. I don't have an easy way of testing that and we haven't necessarily even agreed that this is the right thing to do, so I await feedback! :grinning: