[MacPorts] #66697: doxygen-devel @1.9.6 does not build on macOS High Sierra, Version 10.13.6, because of 'call to unavailable function 'get': introduced in macOS 10.14'?

[MacPorts]

#66697: doxygen-devel @1.9.6 does not build on macOS High Sierra, Version 10.13.6,
because of 'call to unavailable function 'get': introduced in macOS 10.14'?
----------------------------+------------------------
  Reporter:  ballapete      |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.0
Resolution:                 |   Keywords:  highsierra
      Port:  doxygen-devel  |
----------------------------+------------------------

Comment (by ryandesign):

 Yup. This issue is why the doxygen-devel port was created: to verify
 whether the doxygen software builds on all systems before updating the
 doxygen port. Prior to doxygen-devel's creation, the doxygen port was
 updated to 1.9.4, which didn't compile everywhere, #65314 was filed, and
 it was reverted to 1.9.3. Later, doxygen was updated to 1.9.5, it didn't
 build everywhere, #66069 was filed, and it was reverted to 1.9.3 again.

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Ticket URL: <https://trac.macports.org/ticket/66697#comment:1>
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