title: how to address "make: protoc: Command not found"
body: <p>I'm installing Caffe on a CentOS system over which I do not have administrative privileges. When I attempt to compile, I encounter the following message:</p>
  
  <pre><code>PROTOC src/caffe/proto/caffe.proto
  make: protoc: Command not found
  make: *** [.build_release/src/caffe/proto/caffe.pb.cc] Error 127
  </code></pre>
  
  <p>What I have done so far is the following:</p>
  
  <pre><code>cd
  git clone https://github.com/BVLC/caffe.git
  cd caffe
  cp Makefile.config.example Makefile.config
  # Uncomment CPU_ONLY := 1.
  # Include the following lines:
  # INCLUDE_DIRS := $(PYTHON_INCLUDE) /usr/local/include /usr/include/hdf5/serial/
  # LIBRARY_DIRS := $(PYTHON_LIB) /usr/local/lib /usr/lib /usr/lib/x86_64-linux-gnu/hdf5/serial
  pico Makefile.config
  virtualenv caffe
  source caffe/bin/activate
  pip install protobuf
  pip install scikit-image
  make all
  </code></pre>
  
  <p>How should I address this error?</p>