In message <rmioe7zc5rf.fsf@fnord.ir.bbn.com>, Greg Troxel writes:
>If you take the approach that you build and install everything under
>pkg_comp, you can run pkg_chk -ir or something in the chroot to remove
>the out of date stuff, and then run pkg_chk -a against your config
>file.  Then, you can do the same in the real system, but with -b on
>the add step.
>

Possibly, though keeping a duplicate copy of /usr/pkg would cost me a 
noticeable amount of disk space, as would keeping a lot of binary 
packages.

		--Steven M. Bellovin, http://www.cs.columbia.edu/~smb