[MacPorts] #67268: gtk3 fails on 10.5 - missing type_traits

[MacPorts]

#67268: gtk3 fails on 10.5 - missing type_traits
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  Reporter:  rmottola  |      Owner:  mascguy
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  leopard legacy
      Port:  gtk3      |
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Comment (by rmottola):

 what's the best way to do it, kencu? A portgroup to add it?
 I can't find where to mess with compiler options in the portfile.

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Ticket URL: <https://trac.macports.org/ticket/67268#comment:3>
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