[MacPorts] #45781: gtkextra3: new port

[MacPorts]

#45781: gtkextra3: new port
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  Reporter:  Tom.Schoonjans@…  |      Owner:  macports-tickets@…
      Type:  submission        |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.3.2
Resolution:                    |   Keywords:
      Port:  gtkextra3         |
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Comment (by ionic@…):

 One other thing: as far as I could find out, it doesn't support `GTK 3`,
 right? Or does it?

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Ticket URL: <https://trac.macports.org/ticket/45781#comment:10>
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