title: How does MAKE remember the file timestamps
body: <p>I've found <a href="https://stackoverflow.com/questions/7507355/how-does-make-track-timestamps">this question</a> which is basically asking the same, but got no real answer.</p>
  
  <p>Where is the <code>make</code>'s config file / database file where it remembers the file timestamps, so it can tell what changed? I checked and there's no <code>.make</code> or similar in my project, nor in the home directory.</p>
  
  <p>Or does it somehow store the information inside the files themselves, perhaps by modifying the timestamps? (That sounds fishy though)</p>