[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
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 Reporter:  beremour                     |      Owner:  (none)
     Type:  defect                       |     Status:  new
 Priority:  Normal                       |  Milestone:
Component:  ports                        |    Version:  2.6.2
 Keywords:  Catalina Install clang llvm  |       Port:  ffmpeg
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 I have fresh Catalina 10.15.1 and empty MacPorts 2.6.2 installation.
 FFmpeg is the very 1st port to install. I'll attach log file.

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