define print_help
@make -pqR : 2>/dev/null \
        | awk -v RS= -F: '/^# File/,/^# Finished Make data base/ {if ($$1 !~ "^[#.]") {print $$1}}' \
        | sort \
        | grep -E -v -e '^[^[:alnum:]]' -e '^$@$$' \
				| xargs -I _ echo _
endef