[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):

 one thing to know is that macporys-clang-7.0 and later default to c++17 if
 none is specified. This can break builds on software that doesn't set a
 standard.

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Ticket URL: <https://trac.macports.org/ticket/58869#comment:3>
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