1make: "opt-debug-lint.mk" line 19: Variable "X" is undefined 2make: "opt-debug-lint.mk" line 19: Malformed conditional ($X) 3make: "opt-debug-lint.mk" line 41: Variable "UNDEF" is undefined 4make: "opt-debug-lint.mk" line 41: Malformed conditional (${UNDEF}) 5make: "opt-debug-lint.mk" line 61: Missing delimiter ':' after modifier "L" 6make: "opt-debug-lint.mk" line 61: Missing delimiter ':' after modifier "P" 7make: "opt-debug-lint.mk" line 69: Unknown modifier "${" 8make: Fatal errors encountered -- cannot continue 9make: stopped in unit-tests 10exit status 1 11