“This is pretty incredible: I just had to modify a few lines in a Makefile and some C source files, and I got a Lua executable that works both on Linux and Windows (and possibly others as well).”
One binary, built once on Linux, runs on Windows too. Cosmopolitan was only at release 0.2 and a stranger already had Lua running on it. Toolchains have spent decades insisting this needs a separate build per platform. A 344 kilobyte file says otherwise.