[nrclark]

    ---- 
    fetch PACKAGE VER:
        @echo fetching {{PACKAGE}} at version {{VER}}
    ---- 
    $ just fetch foo 1.2.3

Here is the Make equivalent, with equivalent error-checking

    ---- 
    fetch:
        $(if $(PACKAGE),,$(error PACKAGE was not set))
        $(if $(VERSION),,$(error VERSION was not set))
        @echo fetching $(PACKAGE) at $(VERSION)
    ----
    $ make fetch PACKAGE=foo VERSION=1.2.3

I agree that the `just` version is a little neater / tidier. But it's not like Make can't do the same thing. And Make is a much more powerful tool.