build error: libcaffe.so: undefined reference to `google::protobuf

[ysh329]

I build an official caffe without errors following this Ubuntu-16.04-or-15.10-Installation-Guide, but failed this repo with errors below, strange~ 😭

CXX/LD -o .build_release/tools/device_query.bin                                                                                                [32/1808]
CXX tools/finetune_net.cpp
CXX/LD -o .build_release/tools/finetune_net.bin
CXX tools/upgrade_net_proto_text.cpp
CXX/LD -o .build_release/tools/upgrade_net_proto_text.bin.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::AssignDescriptors(std::__cxx11::basic_string<char, std::char_traits<
char>, std::allocator<char> > const&, google::protobuf::internal::MigrationSchema const*, google::protobuf::Message const* const*, unsigned int const*, 
google::protobuf::MessageFactory*, google::protobuf::Metadata*, google::protobuf::EnumDescriptor const**, google::protobuf::ServiceDescriptor const**)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::WireFormatLite::WriteFloatArray(float const*, int, google::protobuf:
:io::CodedOutputStream*)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedInputStream::ReadVarint64Fallback()'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedInputStream::IncrementRecursionDepthAndPushLimit(int)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::WireFormatLite::Int32Size(google::protobuf::RepeatedField<int> const
&)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::WireFormat::ReadPackedEnumPreserveUnknowns(google::protobuf::io::Cod
edInputStream*, unsigned int, bool (*)(int), google::protobuf::UnknownFieldSet*, google::protobuf::RepeatedField<int>*)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedInputStream::ReadVarint32Fallback(unsigned int)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::RegisterAllTypes(google::protobuf::Metadata const*, int)
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedOutputStream::WriteVarint32SlowPath(unsigned int)'          [14/1808]
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::InitProtobufDefaults()'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedInputStream::SkipFallback(int, int)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::Arena::OnArenaAllocation(std::type_info const*, unsigned long) const'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::ArenaImpl::AddCleanup(void*, void (*)(void*))'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::WireFormatLite::WriteDoubleArray(double const*, int, google::protobu
f::io::CodedOutputStream*)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedInputStream::ReadVarintSizeAsIntFallback()'
.build_release/lib/libcaffe.so: undefined reference to `void caffe::ResizeBlob_gpu<float>(caffe::Blob<float> const*, caffe::Blob<float>*)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::RepeatedPtrFieldBase::InternalExtend(int)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::WireFormatLite::UInt32Size(google::protobuf::RepeatedField<unsigned 
int> const&)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::ArenaImpl::AllocateAlignedAndAddCleanup(unsigned long, void (*)(void
*))'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::OnShutdownDestroyMessage(void const*)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedInputStream::DecrementRecursionDepthAndPopLimit(int)'
.build_release/lib/libcaffe.so: undefined reference to `void caffe::ResizeBlob_gpu<double>(caffe::Blob<double> const*, caffe::Blob<double>*)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedOutputStream::WriteVarint64SlowPath(unsigned long)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedInputStream::DecrementRecursionDepthAndPopLimit(int)'
.build_release/lib/libcaffe.so: undefined reference to `void caffe::ResizeBlob_gpu<double>(caffe::Blob<double> const*, caffe::Blob<double>*)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedOutputStream::WriteVarint64SlowPath(unsigned long)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::OnShutdownDestroyString(std::__cxx11::basic_string<char, std::char_t
raits<char>, std::allocator<char> > const*)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::fixed_address_empty_string[abi:cxx11]'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::Message::SpaceUsedLong() const'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::internal::ArenaImpl::AllocateAligned(unsigned long)'
.build_release/lib/libcaffe.so: undefined reference to `google::protobuf::io::CodedInputStream::ReadTagFallback(unsigned int)'
collect2: error: ld returned 1 exit status
Makefile:617: recipe for target '.build_release/tools/upgrade_net_proto_text.bin' failed
make: *** [.build_release/tools/upgrade_net_proto_text.bin] Error 1

Any suggestions? Thanks in advance. 😭