title: pip3 gives CMake Error in CMakeLists.txt
body: <p>I am trying to run pip3 install face_recognition. But it gives below problem for cmake.</p>
  
  <pre><code>Building for: NMake Makefiles
  CMake Error in CMakeLists.txt:
    Generator
  
      NMake Makefiles
  
    does not support platform specification, but platform
  
      x64
  
    was specified.
  
  
  CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
  CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage 
  </code></pre>
  
  <p>pip3 version is 9.03, Python 3.7 and cmake 3.12.0-rc3. I don't have Visual studio. I don't have admin rights on my PC. Hence I downloaded the all the above packages, extracted and added their bin dir in path. Similar way I have installed MinGW and added its bin directory in path. Nothing is working. Couple of forums talk about removing CMakeCache.txt. I am struggling to find CMakeCache.txt. I think pip command is downloading the package, extracting in temp directory and compiling it. When compilation fails it delete the extracted content. Not sure.  Please help</p>