[MacPorts] #52468: gtk3 3.22.0_0 build fails on 10.5 ppc

[MacPorts]

#52468: gtk3 3.22.0_0 build fails on 10.5 ppc
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  Reporter:  dgonyier  |      Owner:  dbevans
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.4
Resolution:            |   Keywords:  leopard powerpc
      Port:  gtk3      |
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Comment (by kencu):

 Yes, probably so. In the end, the cxx11 1.1 PortGroup does fix this build,
 but it does so by forcing appropriate compilers and not via the cxx11
 compatibility flag.

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Ticket URL: <https://trac.macports.org/ticket/52468#comment:63>
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