https://bugs.winehq.org/show_bug.cgi?id=49796
--- Comment #1 from Nikolay Sivov bunglehead@gmail.com --- As far as I can tell mingw-w64 has a copy of widl sources that gets updated at their own pace. That means you don't have to get wine sources to build it. But anyway, since they have custom patches at least for now they won't be able to use external unmodified repo. That kind of initiative should come from mingw-w64 devs I think.