Widelands is building Windows in a GitHub action - that might help you
get started
https://github.com/widelands/widelands/blob/4a9cb01a7326978a1c1d712a709ec30143982fc2/.github/workflows/build.yaml#L177
The same setup is working for Win32 and Win64 there.
Sgrìobh Sidney Markowitz na leanas 17
The macOS build of Enigma 1.30 beta is coming along fine.
I've been able to test my changes on Mac and Linux, but I don't know how
to build on Windows to ensure I don't break anything. The
doc/README.mingw32 file still contains instructions for 32 bit build and
SDL 1.2, so I assume that it is