[MacPorts] #51471: doxygen port fail for install

[MacPorts]

#51471: doxygen port fail for install
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  Reporter:  rz3dvp@…    |      Owner:  css@…
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:  worksforme  |   Keywords:
      Port:  doxygen     |
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Comment (by rz3dvp@…):

 Thank you for help! xcode-select --install is helpful for me, now oxygen
 and gnu radio installed without problem!

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Ticket URL: <https://trac.macports.org/ticket/51471#comment:3>
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