> Yes... that's something that perhaps should be fixed.

Yes please!

> Not only is there
> no way to test, there's currently no rational way to find out which
> userland version is installed, that I know of anyway (I tend to resort
> to the change time of some file that is unlikely to have changed since,
> and a guess based upon what was current about then).

config.guess and other tools key off the kernel version (from uname) 
when identifying userland/libc/include :-(

Andrew