[MacPorts] #57640: opencv @3.4.3: +contrib not configured correctly

[MacPorts]

#57640: opencv @3.4.3: +contrib not configured correctly
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  Reporter:  jtressle  |      Owner:  stromnov
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.5.4
Resolution:            |   Keywords:
      Port:  opencv    |
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Comment (by jmroot):

 According to the duplicate, this is because the algorithm is patent-
 encumbered. I don't know if we are even legally able to turn it on.

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Ticket URL: <https://trac.macports.org/ticket/57640#comment:4>
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