make all fatal error: google/protobuf/arena.h

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### Issue summary

ake: brew: Command not found

PROTOC src/caffe/proto/caffe.proto

CXX .build_release/src/caffe/proto/caffe.pb.cc

In file included from .build_release/src/caffe/proto/caffe.pb.cc:5:0:

.build_release/src/caffe/proto/caffe.pb.h:12:2: error: #error This file was generated by a newer version of protoc which is

 #error This file was generated by a newer version of protoc which is

  ^

.build_release/src/caffe/proto/caffe.pb.h:13:2: error: #error incompatible with your Protocol Buffer headers. Please update

 #error incompatible with your Protocol Buffer headers.  Please update

  ^

.build_release/src/caffe/proto/caffe.pb.h:14:2: error: #error your headers.

 #error your headers.

  ^

.build_release/src/caffe/proto/caffe.pb.h:22:35: fatal error: google/protobuf/arena.h: No such file or directory

compilation terminated.

Makefile:591: recipe for target '.build_release/src/caffe/proto/caffe.pb.o' failed

make: *** [.build_release/src/caffe/proto/caffe.pb.o] Error 1



### Steps to reproduce



If you are having difficulty building Caffe or training a model, please ask the caffe-users mailing list. If you are reporting a build error that seems to be due to a bug in Caffe, please attach your build configuration (either Makefile.config or CMakeCache.txt) and the output of the make (or cmake) command.



### Your system configuration

Operating system: Ubuntu 16:04

Compiler:gcc 5

CUDA version (if applicable):8

CUDNN version (if applicable): 5.1

BLAS:

Python or MATLAB version (for pycaffe and matcaffe respectively): 2.7 no Matlab



My system works well with other DL packages but for caffe, I am getting this error, which seems like an old error, but there is no solution applicable for ubuntu 16.04... should I downgrade to 14.04

[
  {
    "category": "underspecification",
    "rule": "signature.missing_system_requirement",
    "source": "failure_signature",
    "excerpt": "ake: brew: Command not found"
  }
]