1make: "directive-ifmake.mk" line 13: ok: positive condition works 2make: "directive-ifmake.mk" line 24: ok: negation works 3make: "directive-ifmake.mk" line 33: ok: double negation works 4make: "directive-ifmake.mk" line 40: ok: both mentioned 5make: "directive-ifmake.mk" line 47: ok: only those mentioned 6make: "directive-ifmake.mk" line 57: Targets can even be added at parse time. 7make: "directive-ifmake.mk" line 75: ok 8: first 9: second 10: late-target 11exit status 0 12