title: Makefile called in target
body: <p>I have a makefile, called "Makefile", and some target in it like:</p>
  
  <pre><code>file.o: file.c Makefile
        gcc &lt;some flags &amp; options&gt; file.c
  </code></pre>
  
  <p>What exactly does <code>file.o: file.c Makefile</code> do?</p>