[MacPorts] #58930: gcc 8.3.0_4 with _XOPEN_SOURCE=500 breaks with #include <complex>

[MacPorts]

#58930: gcc 8.3.0_4 with _XOPEN_SOURCE=500 breaks with #include <complex>
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  Reporter:  bernstei  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gcc8      |
-----------------------+--------------------

Comment (by kencu):

 Nearly two years on, and I have no idea still if this issue is gone, is an
 upstream issue to worry about, or a MacPorts issue.

 I am not sure how to make any progress here.

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Ticket URL: <https://trac.macports.org/ticket/58930#comment:4>
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