[MacPorts] #57036: GTK3 patch to compile on 10.5 and 10.6

[MacPorts]

#57036: GTK3 patch to compile on 10.5 and 10.6
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  Reporter:  rmottola  |      Owner:  dbevans
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  snowleopard leopard tiger
      Port:  gtk3      |
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Comment (by rmottola):

 I confirm: it is the quartz version, the issues are of course new features
 of Cocoa that are not available on 10.5/10.6

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Ticket URL: <https://trac.macports.org/ticket/57036#comment:3>
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