title: Unix makefile error: 'make: Fatal error: Don't know how to make target '
body: <p>I have the simplest of makefiles:</p>
  
  <pre><code>threads:
     gcc threads.c -o threads
  </code></pre>
  
  <p>but I get the error:</p>
  
  <blockquote>
    <p>'make: Fatal error: Don't know how to make target'  </p>
  </blockquote>
  
  <p>Any ideas what I am doing wrong?  It's probably something simple - I made the makefile in emacs on the system which is trying to run it (Unix)</p>