[MacPorts] #53040: py27-wxpython-3.0 @3.0.2.0 fatal error: 'type_traits' file not found on systems upgraded to libc++

[MacPorts]

#53040: py27-wxpython-3.0 @3.0.2.0 fatal error: 'type_traits' file not found on
systems upgraded to libc++
------------------------------+----------------------
  Reporter:  kencu            |      Owner:  mojca
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  py-wxpython-3.0  |
------------------------------+----------------------

Comment (by kencu):

 Turns out adding the `-stdlib` onto the `CC` compiler spec just doesn't
 work. A somewhat more complicated but functional fix is coming shortly as
 a PR.

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Ticket URL: <https://trac.macports.org/ticket/53040#comment:9>
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