[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:  haspatch
      Port:  doxygen    |
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Comment (by dw@…):

 Please clean your tree then try reapplying the patch.  patch-
 flex_2_6_0.diff should've been created by applying the patch.

 assuming you have the patch in your home directory try:
 $ sudo su -
 # cd
 /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/textproc/doxygen/
 # patch -s -p0 < ~/doxygen_flex2_6_0.diff

 You should then find that the file patch-flex_2_6_0.diff is in the "files"
 subdirectory.
 I'm sure you can probably do it in one line but the above works reliably
 for me.

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Ticket URL: <https://trac.macports.org/ticket/49881#comment:22>
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