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

[MacPorts]

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

 `port upgrade` told me about one problem with the command line tools (that
 I had to accept the license agreement for them to work), it would have
 been helpful if it had told me to upgrade them in the same place

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Ticket URL: <https://trac.macports.org/ticket/68343#comment:14>
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