1make: cond-op-not.mk:30: Not empty evaluates to true. 2make: cond-op-not.mk:39: Not space evaluates to false. 3make: cond-op-not.mk:44: Not 0 evaluates to true. 4make: cond-op-not.mk:53: Not 1 evaluates to false. 5make: cond-op-not.mk:60: Not word evaluates to false. 6make: cond-op-not.mk:65: Malformed conditional '!' 7make: Fatal errors encountered -- cannot continue 8make: stopped making "all" in unit-tests 9exit status 1 10