[MacPorts] #59323: jtc @1.7.4: error: invalid value 'c++14' in '-std=c++14'

[MacPorts]

#59323: jtc @1.7.4: error: invalid value 'c++14' in '-std=c++14'
-------------------------+-------------------------
  Reporter:  ryandesign  |      Owner:  herbygillot
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.1
Resolution:              |   Keywords:
      Port:  jtc         |
-------------------------+-------------------------

Comment (by herbygillot):

 So I think we're still failing in 10.9 even with the
 `compiler.cxx_standard 2014 ` directive.

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Ticket URL: <https://trac.macports.org/ticket/59323#comment:2>
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