[MacPorts] #55309: ffmpeg @3.4 Configure error - build failure on 10.15 High Sierra

[MacPorts]

#55309: ffmpeg @3.4 Configure error - build failure on 10.15 High Sierra
---------------------------+------------------------
  Reporter:  juliangilbey  |      Owner:
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.2
Resolution:                |   Keywords:  highsierra
      Port:  ffmpeg        |
---------------------------+------------------------
Changes (by juliangilbey):

 * Attachment "main.log" added.

 Build log

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Ticket URL: <https://trac.macports.org/ticket/55309>
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