I hadn't even considered `ROOT=/ SYSROOT!=/` but I think you're right, that would be madness so let's avoid it.    On your last point, my brain is currently doing backflips so I can't work out if you're wrong, I'm wrong, or I've just misunderstood what you said. Last night's visit to the hospital at 3am probably isn't helping. I'll come back after more sleep.