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