[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:  dbevans
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.2
Resolution:            |   Keywords:  Catalina Install clang llvm
      Port:  ffmpeg    |
-----------------------+-----------------------------------------

Comment (by jmroot):

 {{{
 :info:configure Include the log file "ffbuild/config.log" produced by
 configure as this will help
 :info:configure solve the problem.
 }}}
 Please attach that log as well.

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Ticket URL: <https://trac.macports.org/ticket/59604#comment:2>
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