[MacPorts] #62805: et @6.1.7: builds failing for all macOS releases earlier than 10.15

[MacPorts]

#62805: et @6.1.7: builds failing for all macOS releases earlier than 10.15
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  Reporter:  mascguy  |      Owner:  l2dy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  et       |
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Comment (by l2dy):

 Replying to [comment:3 ryandesign]:
 > In that case, no amount of using different compilers will help if the
 functionality that is required is not present in (the C++ standard library
 of) earlier OS versions.

 Yes, but if I remove these function calls it could be fixed.

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Ticket URL: <https://trac.macports.org/ticket/62805#comment:4>
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