Installing portupgrade without X.org

[Sergei Gnezdov]

On 2005-04-09, Lewis Thompson <lewiz at compsoc.man.ac.uk> wrote:
> Once you've got portupgrade installed you can control individual 
> ports more specifically through editing pkgtools.conf 
> in /usr/local/etc.

Manpage does not seem to provide much help and I could not find
anything related to individual package configuration options such as
WITHOUT_X11 in the file itself.

Are there any instructions on pkgtools.conf file?