make: Bad modifier `:tx' for WORDS
make: "varmod-to-separator.mk" line 104: Malformed conditional (${WORDS:tx} != "anything")
make: "varmod-to-separator.mk" line 108: Parsing continues here.
make: Bad modifier `:t\X' for WORDS
make: "varmod-to-separator.mk" line 112: Malformed conditional (${WORDS:t\X} != "anything")
make: "varmod-to-separator.mk" line 115: Parsing continues here.
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1