Re: ports with bootstrapping dependencies

Actually, it occurs to me that it's not really necessary to declare a dependency -- that it would suffice for the variant to have a command that checks for the existence of an executable by some name, and to refuse to continue if this command fails. There was some recent discussion about a `ui_fatal' command by which to fail, although I understand that it was simply a proposal not yet implemented. Does this sound plausible, however?