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