make: "opt-debug-lint.mk" line 21: Variable "X" is undefined make: "opt-debug-lint.mk" line 21: Malformed conditional ($X) make: "opt-debug-lint.mk" line 45: Variable "UNDEF" is undefined make: "opt-debug-lint.mk" line 45: Malformed conditional (${UNDEF}) make: "opt-debug-lint.mk" line 67: Missing delimiter ':' after modifier "L" make: "opt-debug-lint.mk" line 67: Missing delimiter ':' after modifier "P" make: "opt-debug-lint.mk" line 76: Unknown modifier "${" make: Fatal errors encountered -- cannot continue make: stopped in unit-tests exit status 1