[MacPorts] #62421: mkvtoolnix 55.0.0: fails to build on macOS 10.14.6

[MacPorts]

#62421: mkvtoolnix 55.0.0: fails to build on macOS 10.14.6
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  Reporter:  mopihopi    |      Owner:  ryandesign
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:
      Port:  mkvtoolnix  |
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Comment (by kencu):

 I'll work on this over time and see if I can get you updating again :>

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Ticket URL: <https://trac.macports.org/ticket/62421#comment:4>
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