Where to find things
  - A place to start: $PREFIX/share/doc/gnurobots/Robots-HOWTO
  - Example maps:     $PREFIX/share/gnurobots/maps/
  - Example robots:   $PREFIX/share/gnurobots/scheme/
  - Binaries:         gnurobots, gnurobots_logfile, xgnurobots
                      (this port adds the 'gnu' prefix to
                       distinguish from /usr/games/robots)