title: "multiple target patterns" Makefile error
body: <p>My makefile fails with error:</p>
  
  <pre><code>Makefile:34: *** multiple target patterns.  Stop.
  </code></pre>
  
  <p>What does it really mean, how can I fix this? </p>
  
  <p>(<a href="http://www.gnu.org/software/make/manual/html_node/Error-Messages.html" rel="noreferrer">GNU make manual</a>, written by Captain Obvious, isn't helping).</p>
  
  <hr>
  
  <p>Found it. I had rule in form:</p>
  
  <pre><code>$(FOO): bar
  </code></pre>
  
  <p>where <code>FOO</code> was set from shell command that polluted it with error message that contained a colon.</p>