[MacPorts] #58869: ispc @1.11.0: fatal error: 'type_traits' file not found

[MacPorts]

#58869: ispc @1.11.0: fatal error: 'type_traits' file not found
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  Reporter:  ryandesign  |      Owner:  tenomoto
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  ispc        |
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Comment (by kencu):

 yes, it is exactly the fact that (all) clang versions behave differently
 across os versions that is leading us to default to libc++ on older
 systems. Then clang will behave the same across os versions, and we will
 see fewer tickets like this one!

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Ticket URL: <https://trac.macports.org/ticket/58869#comment:8>
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