make: "cond-token-string.mk" line 13: Unknown modifier "Z"
make: "cond-token-string.mk" line 13: Malformed conditional ("" != "${:Uvalue:Z}")
make: "cond-token-string.mk" line 22: xvalue is not defined.
make: "cond-token-string.mk" line 28: Malformed conditional (x${:Uvalue} == "")
make: "cond-token-string.mk" line 37: Expected.
CondParser_Eval: "UNDEF"
make: "cond-token-string.mk" line 46: The string literal "UNDEF" is not empty.
CondParser_Eval: " "
make: "cond-token-string.mk" line 54: The string literal " " is not empty, even though it consists of whitespace only.
CondParser_Eval: "${UNDEF}"
make: "cond-token-string.mk" line 63: An undefined variable in quotes expands to an empty string, which then evaluates to false.
CondParser_Eval: "${:Uvalue}"
make: "cond-token-string.mk" line 68: A nonempty variable expression evaluates to true.
CondParser_Eval: "${:U}"
make: "cond-token-string.mk" line 76: An empty variable evaluates to false.
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1