[MacPorts] #59604: ffmpeg @4.2.1 +nonfree: Install fails on Catalina 10.15.1

[MacPorts]

#59604: ffmpeg @4.2.1 +nonfree: Install fails on Catalina 10.15.1
-----------------------+-----------------------------------------
  Reporter:  beremour  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.2
Resolution:            |   Keywords:  Catalina Install clang llvm
      Port:  ffmpeg    |
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Changes (by beremour):

 * Attachment "main.log" added.

 build main log

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Ticket URL: <https://trac.macports.org/ticket/59604>
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