make: "varmod.mk" line 101: To escape a dollar, use \$, not $$, at "$$:L} != """
make: "varmod.mk" line 101: Invalid variable name ':', at "$:L} != """
make: "varmod.mk" line 107: while evaluating "${:Uword:@word@${word}$@} != "word"": Dollar followed by nothing
make: "varmod.mk" line 117: while evaluating variable "VAR": Missing delimiter ':' after modifier "P"
make: "varmod.mk" line 119: Missing argument for ".error"
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1