title: Suppress messages in make clean (Makefile silent remove)
body: <p>I'm wondering how I can avoid some echo in a Makefile :</p>
  
  <pre><code>clean:
      rm -fr *.o
  </code></pre>
  
  <p>this rule will print:</p>
  
  <pre><code>$&gt;make clean   
  rm -fr *.o
  
  $&gt;
  </code></pre>
  
  <p>How can I avoid that?</p>