[MacPorts] #71026: shapelib @1.6.1 -- Unable to build -- fatal error: 'filesystem' file not found

[MacPorts]

#71026: shapelib @1.6.1 -- Unable to build -- fatal error: 'filesystem' file not
found
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  Reporter:  RobK88    |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.10.2
Resolution:            |   Keywords:  highsierra
      Port:  shapelib  |
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Comment (by RobK88):

 P.S.  I also tried building using `clang-11`, `clang-15` and `clang-16`.
 The builds all failed but with different errors.

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Ticket URL: <https://trac.macports.org/ticket/71026#comment:3>
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