title: How to clean the obj and lib files generated by nmake
body: <p>I am using nmake in VS 2012 console to compile GDAL, I want to know which command could help me to remove all files generated by nmake command last time. </p>
  
  <pre><code>c:\gdal&gt;nmake clean
  
  Microsoft (R) Program Maintenance Utility Version 11.00.60610.1
  Copyright (C) Microsoft Corporation.  All rights reserved.
  
  NMAKE : fatal error U1073: don't know how to make 'clean'
  Stop.
  </code></pre>