1make: "cond-op-and.mk" line 36: Variable "UNDEF" is undefined 2make: "cond-op-and.mk" line 41: Variable "UNDEF" is undefined 3make: "cond-op-and.mk" line 44: Variable "UNDEF" is undefined 4make: "cond-op-and.mk" line 60: Unknown operator '&' 5make: "cond-op-and.mk" line 66: Unknown operator '&' 6make: "cond-op-and.mk" line 72: Unknown operator '&' 7make: "cond-op-and.mk" line 78: Unknown operator '&' 8make: "cond-op-and.mk" line 87: Unknown operator '&' 9make: Fatal errors encountered -- cannot continue 10make: stopped in unit-tests 11exit status 1 12