[MacPorts] #62909: current protobuf3-cpp v3.17.0 causes build failure in current py-pytorch v1.8.1

[MacPorts]

#62909: current protobuf3-cpp v3.17.0 causes build failure in current py-pytorch
v1.8.1
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  Reporter:  webbp                     |      Owner:  (none)
      Type:  defect                    |     Status:  new
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:
Resolution:                            |   Keywords:
      Port:  py-pytorch protobuf3-cpp  |
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Description changed by webbp:

Old description:

> This is a known open issue with pytorch:
> https://github.com/pytorch/pytorch/issues/20206
>
> Temporary workaround (verified): install protobuf v3.11.4
>
> For other users: how to install protobuf v3.11.4:
> wiki:howto/InstallingOlderPort

New description:

 This is a known open issue with pytorch:
 https://github.com/pytorch/pytorch/issues/20206

 Temporary workaround (verified): install protobuf v3.11.4

 For other users: how to install protobuf v3.11.4:
 wiki:howto/InstallingOlderPort

 Build environment:
 macOS 10.13.6
 Xcode 10.1
 Build version 10B61
 Apple LLVM version 10.0.0 (clang-1000.10.44.4)
 Target: x86_64-apple-darwin17.7.0
 Thread model: posix
 InstalledDir: /Library/Developer/CommandLineTools/usr/bin
 MacPorts version 2.6.4
 Port: py37-pytorch @1.8.1_2

 Todo:
 Vary cmake vars USE_LITE_PROTO, CAFFE2_LINK_LOCAL_PROTOBUF,
 BUILD_CUSTOM_PROTOBUF, and USE_SYSTEM_LIBS ON/OFF to see if that fixes the
 issue.

 Current Portfile has
 {{{
 CMAKE_LIBRARY_PATH=${prefix}/lib:${prefix}/lib/libomp \
 LIBRARY_PATH=${prefix}/lib:${prefix}/lib/libomp \
 USE_LITE_PROTO=ON \
 }}}
 which also might be relevant.

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Ticket URL: <https://trac.macports.org/ticket/62909#comment:5>
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