make: cond-op-and.mk:36: Variable "UNDEF" is undefined
make: cond-op-and.mk:41: Variable "UNDEF" is undefined
make: cond-op-and.mk:44: Variable "UNDEF" is undefined
make: cond-op-and.mk:60: Unknown operator "&"
make: cond-op-and.mk:66: Unknown operator "&"
make: cond-op-and.mk:72: Unknown operator "&"
make: cond-op-and.mk:78: Unknown operator "&"
make: cond-op-and.mk:87: Unknown operator "&"
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1