[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 dw@…):

 I've implemented a very simple patch that make the amendments to the
 1.8.9.1 source as part of the ports setup.  It's my first submission so
 I'm expecting it to be wrong somehow.  I've built doxygen and several
 packages that depend on it without issue.

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Ticket URL: <https://trac.macports.org/ticket/49881#comment:8>
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