Now you can say just `make' to remake all three programs, or specify asarguments the ones to remake (as in `make prog1 prog3').  Phoniness isnot inherited: the prerequisites of a phony target are not themselvesphony, unless explicitly declared to be so.   When one phony target is a prerequisite of another, it serves as asubroutine of the other.  For example, here `make cleanall' will deletethe object files, the difference files, and the file `program':     .PHONY: cleanall cleanobj cleandiff     cleanall : cleanobj cleandiff             rm program     cleanobj :             rm *.o     cleandiff :             rm *.diff