make: "cond-token-number.mk" line 15: Malformed conditional (-0)
make: "cond-token-number.mk" line 25: Malformed conditional (+0)
make: "cond-token-number.mk" line 35: Malformed conditional (!-1)
make: "cond-token-number.mk" line 45: Malformed conditional (!+1)
make: "cond-token-number.mk" line 89: End of the tests.
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1