Nice quick and dirty hack, but the latency isn't great and it will hammer the file system in large projects calculating time stamps. It's especially bad on windows although polling on mac has also historically been rather expensive (linux is better in this regard though polling still isn't free).

I'd much rather install entr if it's available and do something like

`ls ** | entr -c make`

THIS is the lightest way to have continuous make, without wasting cycles and hammering the file system. inotifywait is a pretty standard tool that does exactly what's needed.

watch : while true; do \ clear; $(MAKE) -j all tests; \ inotifywait -qre close_write src tests; \ done