[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:  closed
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.2
Resolution:  fixed     |   Keywords:  catalina
      Port:  ffmpeg    |
-----------------------+----------------------

Comment (by ryandesign):

 It doesn't seem like this is an ffmpeg-specific problem, and surely the
 ld64 dependency is not needed on older systems. And it's not clear that
 it's still needed on Catalina either, because the logs provided here are
 old: they show clang > 1099 being blacklisted, which has already been
 removed from the port in favor of using the xcode_workaround portgroup,
 whatever that does.

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Ticket URL: <https://trac.macports.org/ticket/59604#comment:13>
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