Thanks Eli, I think this sets me on the right track. I have a Mingw-64 toolchain setup; I used to use Mingw until I stopped making 32 bit builds on my system. I've never compiled Emacs so that's where I'll start.
I'm curious to know if Emacs Windows release binaries typically are cross-compiled? If necessary, to be consistent I could cross compile from Linux. Otherwise I'll just work natively in Windows. - George
