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

[MacPorts]

#65314: doxygen @1.9.4: fails to build on 10.12 and earlier
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  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  reopened
  Priority:  High        |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:
      Port:  doxygen     |
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Comment (by mascguy):

 We also might want to create a devel port, to validate updates prior.

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Ticket URL: <https://trac.macports.org/ticket/65314#comment:9>
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