title: Could not find PROTOBUF Compiler
body: <p>I'm trying to do a CMake with Caffe, but my system cannot find protobuf compiler. I have previously installed protobuf2.7.0. Now I switched back to 2.6.1. How could I configure my CMake to recognize the protobuf2.6.1 compiler?</p>
  
  
  
  <p>I have done </p>
  
  <pre class="lang-none prettyprint-override"><code>$ sudo apt-get install  libprotobuf-dev protobuf-compiler
  $ protoc --version
  libprotoc 2.6.1
  </code></pre>
  
  <p>But when I try to cmake Caffe, it still gives me the error </p>
  
  <pre class="lang-none prettyprint-override"><code>user@user-computer:~/caffe/build$ cmake -DBLAS=open ..
  -- Boost version: 1.58.0
  -- Found the following Boost libraries:
  --   system
  --   thread
  --   filesystem
  --   chrono
  --   date_time
  --   atomic
  -- Found gflags  (include: /usr/include, library: /usr/lib/x86_64-linux-gnu/libgflags.so)
  -- Found glog    (include: /usr/include, library: /usr/lib/x86_64-linux-gnu/libglog.so)
  CMake Error at cmake/ProtoBuf.cmake:13 (message):
    Could not find PROTOBUF Compiler
  Call Stack (most recent call first):
    cmake/Dependencies.cmake:43 (include)
    CMakeLists.txt:46 (include)
  
  
  -- Configuring incomplete, errors occurred!
  See also "/home/user/caffe/build/CMakeFiles/CMakeOutput.log".
  See also "/home/user/caffe/build/CMakeFiles/CMakeError.log".
  </code></pre>