[MacPorts] #44201: mkvtoolnix build failure due to stray @ in NSObjCRuntime.h

[MacPorts]

#44201: mkvtoolnix build failure due to stray @ in NSObjCRuntime.h
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  Reporter:  rainer+macports@…  |      Owner:  macports-tickets@…
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.3.1
Resolution:                     |   Keywords:
      Port:  mkvtoolnix         |
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Comment (by mojca@…):

 It will only fail if compiled against `libstdc++` (and if dependencies are
 not compiled with the same compiler), but yes, it fails "by default".

 The error looks like compiler that doesn't understand ObjC trying to
 import some ObjC code.

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Ticket URL: <https://trac.macports.org/ticket/44201#comment:5>
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