[MacPorts] #68343: ffmpeg configure fails, clang unable to create executables

[MacPorts]

#68343: ffmpeg configure fails, clang unable to create executables
---------------------------+--------------------
  Reporter:  ShadSterling  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  ffmpeg        |
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Comment (by ShadSterling):

 Yep, that was it.  Apparently Xcode got updated automatically but the
 command line tools didn't, and when I got the message and ran the command
 to accept the license agreement it didn't warn me about the mismatch.
 Seems like something Apple could do better.  After updating the command
 line tools it's working again.  Thanks!

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Ticket URL: <https://trac.macports.org/ticket/68343#comment:5>
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