[MacPorts] #56411: opencv @3.4.1_2 +python27 fails to build on 10.13.4 HighSierra

[MacPorts]

#56411: opencv @3.4.1_2 +python27 fails to build on 10.13.4 HighSierra
------------------------+----------------------
  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 johankytt):

 Changing
 {{{
 depends_lib-append      path:${prefix}/lib/libprotobuf.dylib:protobuf3-cpp
 }}}
 in the portfile works on OSX 10.11.6 as well

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Ticket URL: <https://trac.macports.org/ticket/56411#comment:7>
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