[MacPorts] #57346: opencv +python36: error: no type named 'SequenceNumber' in namespace 'google::protobuf::internal'

[MacPorts]

#57346: opencv +python36: error: no type named 'SequenceNumber' in namespace
'google::protobuf::internal'
---------------------------+----------------------
  Reporter:  hartmutlentz  |      Owner:  stromnov
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:                |   Keywords:
      Port:  opencv        |
---------------------------+----------------------

Comment (by mascguy):

 Is this still an issue?

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Ticket URL: <https://trac.macports.org/ticket/57346#comment:3>
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