[MacPorts] #56004: audacity @2.2.0: error: unknown type name 'unique_ptr'

[MacPorts]

#56004: audacity @2.2.0: error: unknown type name 'unique_ptr'
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  Reporter:  ryandesign  |      Owner:  RJVB
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  audacity    |
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Comment (by RJVB):

 AFAICT this is because of an updated dependency, probably wxWidgets. If
 that is indeed the case, the cxx11 PG should be included by the wxWidgets
 PG.

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Ticket URL: <https://trac.macports.org/ticket/56004#comment:1>
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