make: "cond-token-number.mk" line 13: Malformed conditional (-0)
make: "cond-token-number.mk" line 21: Malformed conditional (+0)
make: "cond-token-number.mk" line 29: Malformed conditional (!-1)
make: "cond-token-number.mk" line 37: Malformed conditional (!+1)
make: "cond-token-number.mk" line 54: End of the tests.
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1