[MacPorts] #61298: ffmpeg @4.3.1 +gpl2 +nonfree Build fails Undefined symbols for architecture x86_64: :info:build "_ff_butterflies_fixed_sse2" and more

[MacPorts]

#61298: ffmpeg @4.3.1 +gpl2 +nonfree Build fails Undefined symbols for architecture
x86_64: :info:build   "_ff_butterflies_fixed_sse2" and more
-----------------------+----------------------
  Reporter:  MeNdMont  |      Owner:  dbevans
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.3
Resolution:            |   Keywords:
      Port:  ffmpeg    |
-----------------------+----------------------

Comment (by kencu):

 Non-default variants on MacPorts are rarely tested, unfortunately. You'll
 have better luck with the default variant set, that is built on every
 buildbot, and usually is fixed to work everywhere. I'm just trying a build
 on {{{ffmpeg +nonfree}}} on a 10.14 system to see if it will build there.

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Ticket URL: <https://trac.macports.org/ticket/61298#comment:6>
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