[MacPorts] #57341: opencv @3.4.1_2 +contrib error - build failure

[MacPorts]

#57341: opencv @3.4.1_2 +contrib error - build failure
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  Reporter:  lbarrows  |      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 lbarrows):

 I have confirmed that the '''OpenCV +contrib''' build is //still//
 **broken** under **High Sierra** two weeks later, using either protobuf-
 cpp or protobuf3-cpp.

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Ticket URL: <https://trac.macports.org/ticket/57341#comment:4>
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