[MacPorts] #63418: mkvtoolnix @ 41.0.0_1 fails to build on 10.11.6 with boost 1.76

[MacPorts]

#63418: mkvtoolnix @ 41.0.0_1 fails to build on 10.11.6 with boost 1.76
---------------------------+----------------------------
  Reporter:  sambthompson  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:  boost optional
      Port:  mkvtoolnix    |
---------------------------+----------------------------
Changes (by sambthompson):

 * Attachment "main.log" added.

 mkvtoolnix upgrade main.log

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Ticket URL: <https://trac.macports.org/ticket/63418>
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