> On Apr 18, 2022, at 15:09, Z. Majeed <zmajeed@sbcglobal.net> wrote: > > man ptsname says to define _XOPEN_SOURCE >= 500. I found that -D_XOPEN_SOURCE=700 works Interesting … Cygwin’s own `man ptsname` doesn’t show that--on my system, at least?--though macOS’s does. Or do I somehow have an outdated Cygwin man-pages? -F