Frustratingly there is still value in the old style jobserver because old versions of GNU make are prevalent in the wild, i.e. on macOS. I'm at the point where

Frustratingly there is still value in the old style jobserver because old versions of GNU make are prevalent in the wild, i.e. on macOS. I'm at the point where if you're going to require users to install something, rather than a newer version of make, I'd rather require a more modern build tool and disregard make entirely.