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Re:Time for Makefiles to Make a Comeback by oso2k on Tuesday September 05, 2017 @05:14AM (#15173581)
Easy enough (assuming $SRC is your list of source files and 'all' is top level target) 'make watch' could do this

   watch:
        while ! inotifywait -e modify $(SRC) ; do time -p make all; done
Re:Time for Makefiles to Make a Comeback by lloeki on Tuesday September 05, 2017 @05:56AM (#15173759)
If you care for it, fswatch is cross-platform:

https://github.com/emcrisostomo/fswatch