[MacPorts] #57735: Gate: fatal error: 'string_view' file not found

[MacPorts]

#57735: Gate: fatal error: 'string_view' file not found
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  Reporter:  mojca   |      Owner:  mojca
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  gate    |
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Comment (by cjones051073):

 Hacking geant4-config after the fact is I think not the way to go. Instead
 I would first look to updating the geant4 build to enable cxx17 there.
 Then, geant4-config should automatically reflect this.

 Aslo, take a look at the compiler settings in root6. There I believe I
 already force the use of MPs clang 7 on 10.12 and older, for essentially
 the same reason as here.

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Ticket URL: <https://trac.macports.org/ticket/57735#comment:6>
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