It’s early days, but the mingw64 port can be described as “breathing” (and in parallel)…
Keep an eye on the GitHub pull requests - I’ll push when Work in progress now at PR#173 - bytecode only (the testsuite is almost entirely passing with
make world compiles completely.
make -C testsuite BYTECODE_ONLY=true all-enabled) and only mingw64. The build is configured in the same way as normal (i.e. copying files, not running