https://bugs.winehq.org/show_bug.cgi?id=45064
--- Comment #5 from Vincent Povirk madewokherd@gmail.com --- Well, that depends on whether the problem has anything to do with our using a modified version of Mono. I don't think it should, but I won't be able to investigate.
This is why the source tarballs have monolite - they need to be self-contained and not rely on Mono's build server. Hopefully the master branch works better.