[MacPorts] #42869: mlt build fails with clang: error: unknown argument

[MacPorts]

#42869: mlt build fails with clang: error: unknown argument
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  Reporter:  me@…        |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.2.1
Resolution:              |   Keywords:  -Wunused-command-line-argument-
      Port:  mlt         |  hard-error-in-future
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Comment (by dan@…):

 I believe the patches I just attached fix the problem.

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Ticket URL: <https://trac.macports.org/ticket/42869#comment:2>
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