------------------------------------------------------------------------------
      Fill ALT_PKGDEP section in pkgtools.conf file for portupgrade to be
      aware of alternative dependencies you use.
      E.g.
      ALT_PKGDEP = {
        # Use the -nox11 port when another port depends on category/portexample
        'category/portexample' => 'category/portexample-nox11',
      }

      Note also, portupgrade knows nothing about how to handle ports with
      different suffixes (E.g. -nox11). So you should explicitly define
      variables (E.g. WITHOUT_X11=yes) for the ports in /etc/make.conf or
      pkgtools.conf (MAKE_ARGS section) files.
------------------------------------------------------------------------------
