make: "cond-token-var.mk" line 20: ok
make: "cond-token-var.mk" line 27: Malformed conditional (${UNDEF} == ${DEF})
make: "cond-token-var.mk" line 33: Malformed conditional (${DEF} == ${UNDEF})
make: "cond-token-var.mk" line 42: Malformed conditional (${UNDEF})
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1