[MacPorts] #65314: doxygen-devel @1.9.4: fails to build on 10.12 and earlier

[MacPorts]

#65314: doxygen-devel @1.9.4: fails to build on 10.12 and earlier
----------------------------+-----------------------
  Reporter:  ryandesign     |      Owner:  michaelld
      Type:  defect         |     Status:  reopened
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.7.2
Resolution:                 |   Keywords:
      Port:  doxygen-devel  |
----------------------------+-----------------------

Comment (by mascguy):

 As for the update to 1.9.4, it's interesting that the build succeeds for
 10.6 (both x32 and x64), with Clang 11. Hmmm...

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Ticket URL: <https://trac.macports.org/ticket/65314#comment:17>
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