Building ports in a chrooted tree

["." at babolo.ru]

> On Wed, 23 Apr 2003 11:16:50 +0400 (MSD)
> . at babolo.ru wrote:
> > > Simplified explanation of what this does:
> > > This builds the world, installs it into a subdir, copies /usr/ports into
> > Or better nullfs mount RO it from base system
> > to chrooted.
> If I use nullfs it is possible to influence the build in the chroot by
> modifying /usr/ports. My goal was to be able to just start a
> chroot-build and forget about it, including being able to build any port
I too, so I use read only mounts
of /usr/ports

> I want on the host system (I use a 800 MHz Duron for work on the
> SystemOnCD port, doing a complete build needs a while...).