[MacPorts] #65377: Volk 2.5.1 Broken on <= 10.14, needs std::filesystem

[MacPorts]

#65377: Volk 2.5.1 Broken on <= 10.14, needs std::filesystem
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  Reporter:  michaelld  |      Owner:  michaelld
      Type:  defect     |     Status:  reopened
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  volk       |
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Comment (by michaelld):

 OK so now Volk is back to 2.5.0 & should be more universally buildable.
 What to do here? I'd love a more universal solution for the libc++ issues.
 We have this Volk one (std::filesystem) as well as the recent Doxygen one
 (https://trac.macports.org/ticket/65314). We can try static linking of MP-
 libc++.a, but that will currently be a one-off solution for each port.
 It'd be great if we could somehow just move MP to use the MP-libc++.dylib
 ... @kencu is probably the most knowledgable about this! Do we have a MP
 ticket up for this discussion already? If so then we can tag it here &
 close this issue.

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Ticket URL: <https://trac.macports.org/ticket/65377#comment:11>
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