[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:  dbevans
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.2
Resolution:            |   Keywords:  catalina
      Port:  ffmpeg    |
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Comment (by cjones051073):

 Glad that helped. No, its not normal to need it, but it often helps. I
 think in this case adding it as a build dep makes sense.

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Ticket URL: <https://trac.macports.org/ticket/59604#comment:10>
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