title: ERROR: dlib-19.8.1-cp36-cp36m-win_amd64.whl is not a supported wheel on this platform
body: <p>while downloading the dlib module, the terminal output returns with an error:</p>
  
  <p>CMake Error in CMakeLists.txt:
        The CMAKE_CXX_COMPILER:</p>
  
  <pre><code>    cl
  
    is not a full path and was not found in the PATH.
  
    To use the NMake generator with Visual C++, cmake must be run from a shell
    that can use the compiler cl from the command line.  This environment is
    unable to invoke the cl compiler.  To fix this problem, run cmake from the
    Visual Studio Command Prompt (vcvarsall.bat).
  
    Tell CMake where to find the compiler by setting either the environment
    variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
    to the compiler, or to the compiler name if it is in the PATH.
  </code></pre>