"In a previous message, John Kohl wrote:"
> 
> You can even use null mounts and/or union mounts to facilitate the
> process (by mounting /usr/src into the new rooted tree so you can build
> in it, and/or by union mounting your bootstrap tools & include files
> into the target area before you replace them in the top union layer).
> 
> Now, I don't have time or disk space to cobble together such an
> environment, but maybe somebody here does?

I've got time, and I've got disk space, and I would really like to see this
work.  I tried doing something similar a while back with limited success.
I will start looking into this, but the one thing I am a little short of is
knowledge.  Can someone point me to some references on the union file
system?  I know the build process, and all about chroot, but union is
really unclear to me.

The product of this work will be a document describing how to do it and
supporting scripts?

Mark