On 2021-12-30, NRK <n...@disroot.org> wrote: > Hmm, I was under the impression that `?=` was accepted into POSIX. But I > cannot find any mention of it in the posix manpage (man 1p make) so I > guess I was wrong.
It is accepted for the upcoming POSIX issue 8: https://austingroupbugs.net/view.php?id=330
