https://bugs.winehq.org/show_bug.cgi?id=51698
--- Comment #5 from cqwrteur euloanty@live.com --- (In reply to Nikolay Sivov from comment #4)
How do I build this, with ucrt or msvcrt, so it runs on Windows too?
yes. just clone it and -Ifast_io/include. -std=c++20. It is a header only library.
msvcrt works. ucrt does not. since ucrt on wine does not flush.