1make: "directive-ifmake.mk" line 8: ok: positive condition works 2make: "directive-ifmake.mk" line 19: ok: negation works 3make: "directive-ifmake.mk" line 25: ok: double negation works 4make: "directive-ifmake.mk" line 32: ok: both mentioned 5make: "directive-ifmake.mk" line 39: ok: only those mentioned 6make: "directive-ifmake.mk" line 49: Targets can even be added at parse time. 7: first 8: second 9: late-target 10exit status 0 11