title: cmake MSYS Makefiles generator missing
body: <p>I have cmake 3.2.3 installed via pacman.  I get an error when I try to use it from a msys64 shell:</p>
  
  <pre><code>$ cmake -G "MSYS Makefiles" ..
  CMake Error: Could not create named generator MSYS Makefiles
  </code></pre>
  
  <p>cmake --help does not list it as an available generator.</p>
  
  <p>I do see there is an MSYS.cmake in /usr/share/cmake-3.2.3/Modules/Platform.</p>
  
  <p>What am I missing?</p>