> so unless he is porting to a non POSIX platform Very likely gmake works on non-posix platforms. Whether there is a requirement that the jobserver also works

> so unless he is porting to a non POSIX platform Very likely gmake works on non-posix platforms. Whether there is a requirement that the jobserver also works there I don't know. It also needs to work on non-linux platforms. So a portable solution (or multiple non-portable ones) is needed.