make: "cond-undef-lint.mk" line 23: Variable "UNDEF" is undefined
make: "cond-undef-lint.mk" line 23: Malformed conditional (${UNDEF})
make: "cond-undef-lint.mk" line 38: Variable "UNDEF" is undefined
make: "cond-undef-lint.mk" line 38: Variable "VAR." is undefined
make: "cond-undef-lint.mk" line 38: Malformed conditional (${VAR.${UNDEF}})
make: "cond-undef-lint.mk" line 49: Variable "VAR.defined" is undefined
make: "cond-undef-lint.mk" line 49: Malformed conditional (${VAR.${DEF}})
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1