title: CMake does not find Visual C++ compiler
body: <p>After installing Visual Studio 2015 and running CMake on a previous project, CMake errors stating that it could not find the C compiler.</p>
  
  <pre><code>The C compiler identification is unknown
  The CXX compiler identification is unknown
  CMake Error at CMakeLists.txt:4 (PROJECT):
    No CMAKE_C_COMPILER could be found.
  
  CMake Error at CMakeLists.txt:4 (PROJECT):
    No CMAKE_CXX_COMPILER could be found.
  </code></pre>
  
  <p>I went searching for <code>cl.exe</code> in the Visual Studio folder,<code>C:\Program Files\Microsoft Visual Studio 14.0</code>, and could not find it.  </p>
  
  <p>How do I set up CMake to work on Windows with Visual Studio 2015?</p>