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