[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
-------------------------+----------------------
  Reporter:  dgonyier@…  |      Owner:  devans@…
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:  leopard
      Port:  gtk3        |
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Comment (by larryv@…):

 I don’t believe this is the case. MacPorts’ libstdc++
 (`/opt/local/*/libstdc++.dylib`) and Apple’s libstdc++ (everything else)
 are distinct. It doesn’t matter which compiler was used to build them.

 What you have to do is make sure that all your ports use MacPorts’
 libstdc++ and not Apple’s, which you would try to do by setting
 `default_compilers` as Jeremy mentioned earlier.

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Ticket URL: <https://trac.macports.org/ticket/52468#comment:20>
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