I have the following issue with protobuf
lib/Importer/libImporter.a(caffe2.pb.cc.o):(.data.rel.ro+0xaf0): undefined reference to `google::protobuf::Message::InitializationErrorString[abi:cxx11]() const'
lib/Importer/libImporter.a(caffe2.pb.cc.o):(.data.rel.ro+0xb90): undefined reference to `google::protobuf::Message::GetTypeName[abi:cxx11]() const'
lib/Importer/libImporter.a(caffe2.pb.cc.o):(.data.rel.ro+0xbc8): undefined reference to `google::protobuf::Message::InitializationErrorString[abi:cxx11]() const'
lib/Importer/libImporter.a(caffe2.pb.cc.o):(.data.rel.ro+0xc68): undefined reference to `google::protobuf::Message::GetTypeName[abi:cxx11]() const'
lib/Importer/libImporter.a(caffe2.pb.cc.o):(.data.rel.ro+0xca0): undefined reference to `google::protobuf::Message::InitializationErrorString[abi:cxx11]() const'
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
[214/282] Linking CXX executable bin/char-rnn
ninja: build stopped: subcommand failed.

And I have following version of protobuf it is 3.6.1 which is >= 2.6.1
marat@moon:~/glow/build_Debug$ which protoc
/home/marat/anaconda3/bin/protoc
marat@moon:~/glow/build_Debug$ protoc --version
libprotoc 3.6.1
marat@moon:~/glow/build_Debug$

I also will be very appreciated if you say where did you take llvm-8 because I failed to find it by apt in my ubuntu 16.04
UPDATE
I removed anaconda form $PATH and it helped. But I do not know how it will work: pytorch with version of 3.6.1 and glow compiled with 2.6.1. So it seems that problem on compilation stage accrued due to libraries versions mismatch .