make: "cond-token-var.mk" line 21: ok
make: "cond-token-var.mk" line 28: Malformed conditional (${UNDEF} == ${DEF})
make: "cond-token-var.mk" line 34: Malformed conditional (${DEF} == ${UNDEF})
make: "cond-token-var.mk" line 44: Malformed conditional (${UNDEF})
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1