[MacPorts] #64869: PDAL @2.3.99.1: fatal error: 'filesystem' file not found

[MacPorts]

#64869: PDAL @2.3.99.1: fatal error: 'filesystem' file not found
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  Veence
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:
      Port:  PDAL        |
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Comment (by ryandesign):

 It needs `<filesystem>` which I understand is a C++17 thing. You can
 request MacPorts select a C++17-compatible compiler by writing
 `compiler.cxx_standard 2017`. The port already says `compiler.cxx_standard
 2011` so just change that to 2017.

 Before it was in C++17 I guess this feature was in boost. If the preceding
 does not work and you want to use boost, use the boost portgroup. Boost
 versions are often incompatible with one another which is why we have
 multiple boost ports, so you can select whichever version is compatible
 with the particular project.

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Ticket URL: <https://trac.macports.org/ticket/64869#comment:2>
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