I just noticed that 'webkit-patch land' now prints this: WARNING: Not running on native Windows. It's coming from Tools/Scripts/webkitpy/port/win.py, which is evidently not supposed to be imported except on Windows. I'm tempted to debug where it's coming from by removing the try/except at the top of win.py, except, due to the nature of the bug, it requires some care to figure out how not to accidentally commit that change when testing 'webkit-patch land' :D Note: we should fix unrelated bug #152495 too!