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