[MacPorts] #56511: gcc49 @4.9.4_2: build fails with Xcode 9 on macOS 10.12

[MacPorts]

#56511: gcc49 @4.9.4_2: build fails with Xcode 9 on macOS 10.12
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  Reporter:  mopihopi  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gcc49     |
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Comment (by aberezin):

 Is there a fix for this?  I had to uninstall gcc49 for now.

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Ticket URL: <https://trac.macports.org/ticket/56511#comment:8>
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