1make: "cond-token-number.mk" line 16: Malformed conditional '-0' 2make: "cond-token-number.mk" line 27: Malformed conditional '+0' 3make: "cond-token-number.mk" line 38: Malformed conditional '!-1' 4make: "cond-token-number.mk" line 49: Malformed conditional '!+1' 5make: Fatal errors encountered -- cannot continue 6make: stopped making "all" in unit-tests 7exit status 1 8