[MacPorts] #42203: grass: allow building without GUI

[MacPorts]

#42203: grass: allow building without GUI
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  Reporter:  mojca@…      |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  grass        |
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Comment (by mojca@…):

 From IRC (neverpanic):
 > if it always contains the console functionality, I'd use `+gui`
 > If it switches between console and gui functionality, separate subports
 seems more like the way to go

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Ticket URL: <https://trac.macports.org/ticket/42203#comment:2>
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