[MacPorts] #61668: ffmpeg 4.3.1: fails to install on Apple Silicon

[MacPorts]

#61668: ffmpeg 4.3.1: fails to install on Apple Silicon
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  Reporter:  jpanetta  |      Owner:  dbevans
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  ffmpeg    |
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Comment (by kencu):

 all newer systems, I guess I should have said, that are not defaulting to
 the C version of librsvg now.

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Ticket URL: <https://trac.macports.org/ticket/61668#comment:15>
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