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      Fill ALT_PKGDEP section in pkgtools.conf file for portupgrade
      be aware of alternative dependencies you use.
      E.g.
      ALT_PKGDEP = {
      	'www/apache13' => 'www/apache13-modssl',
	'print/ghostscript-gnu' => 'print/ghostscript-gpl',	
      }

      Note also, portupgrade knows nothing 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.
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