> "Use a recent bash" seems like a matter of preference. Unfortunately it's not merely a preference; old Bash versions (in particular the one that shipped on m

> "Use a recent bash" seems like a matter of preference. Unfortunately it's not merely a preference; old Bash versions (in particular the one that shipped on macOS for a long time) have had at least one nasty behavior (I think multiple, but I recall at least definitely one) that have been fixed since then, but which cause grief in Makefiles. I don't recall what it was or have a link handy, but if anybody knows, please leave it here; it's a well-known issue.