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

Comment (by cjones051073):

 Correction. Please make sure you have the `ld64` port installed, and that
 it is using the Xcode variant, i.e.

 {{{
  > port installed ld64
 The following ports are currently installed:
   ld64 @3_1+ld64_xcode (active)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/59604#comment:6>
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