[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):

 If I install `root6 -cxx17`, Gate compiles out of the box and works
 correctly.

 I need to figure out how to properly supply the standard to Gate
 configuration. I believe that hardcoding `CXXFLAGS` to a particular
 standard is considered a bad idea.

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Ticket URL: <https://trac.macports.org/ticket/57735#comment:9>
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