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