[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 mojca):

 I assume that's because C++17 is needed. 10.13 seems to compile this fine,
 while it fails on 10.11 and earlier.
 I assume I need to include the `cxx17` PortGroup :)

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Ticket URL: <https://trac.macports.org/ticket/57735#comment:2>
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