[MacPorts] #49881: doxygen 1.8.9.1 build error with flex 2.6.0

[MacPorts]

#49881: doxygen 1.8.9.1 build error with flex 2.6.0
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  Reporter:  sxcurry@…  |      Owner:  css@…
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.3.4
Resolution:             |   Keywords:
      Port:  doxygen    |
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Comment (by ryandesign@…):

 Those diffs don't apply cleanly to 1.8.9.1; we should [ticket:48231 update
 to 1.8.10] first.

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Ticket URL: <https://trac.macports.org/ticket/49881#comment:6>
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