[MacPorts] #58996: mkvtoolnix @30.1.0_1: compilation errors

[MacPorts]

#58996: mkvtoolnix @30.1.0_1: compilation errors
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  Reporter:  MaddTheSane  |      Owner:  ryandesign
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.5.4
Resolution:               |   Keywords:
      Port:  mkvtoolnix   |
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Comment (by mf2k):

 Thanks. [https://guide.macports.org/#development.patches Per the
 guidelines], please instead attach a unified diff of the Portfile so we
 can easily see what changes you are proposing. Or better yet,
 [wiki:WorkingWithGit#pr submit a GitHub pull request].

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Ticket URL: <https://trac.macports.org/ticket/58996#comment:12>
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