[MacPorts] #56411: opencv @3.4.1_2+contrib fails to build with protobuf-cpp

[MacPorts]

#56411: opencv @3.4.1_2+contrib fails to build with protobuf-cpp
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  Reporter:  duchowski  |      Owner:  stromnov
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.3
Resolution:             |   Keywords:
      Port:  opencv     |
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Comment (by mascguy):

 opencv has been using protobuf3 for some time. Can this be closed?

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Ticket URL: <https://trac.macports.org/ticket/56411#comment:9>
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