sysinfo() kernel variance

[Stephen Weeks]

> I would say that the right thing to do is to have something like  `configure'
> which  tests  if  you have it, and if you don't, fakes it (with a new include
> file and a new C program).  If that sounds ok to you, I'll  hack  together  a
> copy of the code that does this.

I've been wondering if I should use configure for the cross compiler
stuff. 

Hmm.  This is something that has to happen at runtime system init time,
right?  Otherwise, how will the executables that we ship work?  So I'm
not sure if doing it at build time is the right thing.