[MacPorts] #71548: gtk-osx-application-gtk2 build error: cannot find protocol declaration for 'NSString'

[MacPorts]

#71548: gtk-osx-application-gtk2 build error: cannot find protocol declaration for
'NSString'
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  Reporter:  barracuda156              |      Owner:  mascguy
      Type:  defect                    |     Status:  assigned
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:  2.10.5
Resolution:                            |   Keywords:
      Port:  gtk-osx-application-gtk2  |
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Comment (by barracuda156):

 UPD. Perhaps the second error is specific to 10a190, so I will fix it in
 the form, but C11 requirement is probably generally applicable.

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Ticket URL: <https://trac.macports.org/ticket/71548#comment:1>
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