make: "directive-ifmake.mk" line 13: ok: positive condition works
make: "directive-ifmake.mk" line 24: ok: negation works
make: "directive-ifmake.mk" line 33: ok: double negation works
make: "directive-ifmake.mk" line 40: ok: both mentioned
make: "directive-ifmake.mk" line 47: ok: only those mentioned
make: "directive-ifmake.mk" line 57: Targets can even be added at parse time.
make: "directive-ifmake.mk" line 75: ok
: first
: second
: late-target
make: don't know how to make !edge (continuing)

Stop.
make: stopped in unit-tests
exit status 1