[MacPorts] #64469: ffmpeg-devel @5.0: buildbot failures for 10.9 through 10.11

[MacPorts]

#64469: ffmpeg-devel @5.0: buildbot failures for 10.9 through 10.11
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  Reporter:  mascguy              |      Owner:  mascguy
      Type:  defect               |     Status:  assigned
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:  2.7.1
Resolution:                       |   Keywords:
      Port:  ffmpeg-devel ffmpeg  |
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Comment (by mascguy):

 FYI for anyone interested: This issue is a blocker, preventing us from
 updating the non-Devel port to 5.0.

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Ticket URL: <https://trac.macports.org/ticket/64469#comment:3>
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