[MacPorts] #57107: protobuf3-cpp version 3.6.1 conflicts with opencv @3.4.1_2+contrib+python27

[MacPorts]

#57107: protobuf3-cpp version 3.6.1 conflicts with opencv @3.4.1_2+contrib+python27
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  Reporter:  jtressle              |      Owner:  (none)
      Type:  defect                |     Status:  new
  Priority:  Normal                |  Milestone:  MacPorts 2.6.0
 Component:  ports                 |    Version:  2.5.3
Resolution:                        |   Keywords:  protobuf3-cpp opencv
      Port:  protobuf3-cpp opencv  |
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Comment (by jtressle):

 I just now was able to build and install opencv+contrib+python27 by
 downgrading protobuf3-cpp to version 3.5.1.

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Ticket URL: <https://trac.macports.org/ticket/57107#comment:1>
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