title: How to get a shell environment variable in a makefile?
body: <p>In shell when I enter</p>
  
  <pre><code>echo $demoPath
  </code></pre>
  
  <p>it prints</p>
  
  <pre><code>/usr/local/demo
  </code></pre>
  
  <p>How can I get the value of this variable <code>$demoPath</code> in a makefile?</p>