: undefined 
make: Unclosed variable "UNCLOSED"
	in command ": $@ ${UNCLOSED"
	in target "unclosed-expression"
make: Unclosed expression, expecting '}'
	while evaluating variable "UNCLOSED" with value ""
	in command ": $@ ${UNCLOSED:"
	in target "unclosed-modifier"
make: Unknown modifier ":Z"
	while evaluating variable "UNKNOWN" with value ""
	in command ": $@ ${UNKNOWN:Z}"
	in target "unknown-modifier"
: end
exit status 2