make: "cond-token-string.mk" line 15: while evaluating "${:Uvalue:Z}"": Unknown modifier "Z"
make: "cond-token-string.mk" line 15: Malformed conditional ("" != "${:Uvalue:Z}")
make: "cond-token-string.mk" line 25: xvalue is not defined.
make: "cond-token-string.mk" line 32: Malformed conditional (x${:Uvalue} == "")
make: "cond-token-string.mk" line 42: Expected.
CondParser_Eval: "UNDEF"
make: "cond-token-string.mk" line 52: The string literal "UNDEF" is not empty.
CondParser_Eval: " "
make: "cond-token-string.mk" line 61: The string literal " " is not empty, even though it consists of whitespace only.
CondParser_Eval: "${UNDEF}"
make: "cond-token-string.mk" line 71: An undefined variable in quotes expands to an empty string, which then evaluates to false.
CondParser_Eval: "${:Uvalue}"
make: "cond-token-string.mk" line 77: A nonempty expression evaluates to true.
CondParser_Eval: "${:U}"
make: "cond-token-string.mk" line 86: An empty variable evaluates to false.
CondParser_Eval: ("${VAR}")
CondParser_Eval: "quoted" == quoted
Comparing "quoted" == "quoted"
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1