make: "cond-op.mk" line 45: Malformed conditional ("!word" == !word)
make: "cond-op.mk" line 59: Malformed conditional (0 ${ERR::=evaluated})
make: "cond-op.mk" line 63: warning: After detecting a parse error, the rest is evaluated.
make: "cond-op.mk" line 67: Parsing continues until here.
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1