title: Makefile ifeq logical AND
body: <p>I would like to check multiple conditions in an <code>if</code> loop of GNU make file. Here's an example:</p>
  
  <pre><code>ifeq ($(TEST_FLAG),TRUE &amp;&amp; ($(DEBUG_FLAG),FALSE))
  true statement 
  else 
  false statement
  endif
  </code></pre>
  
  <p>What's the right way to do it?</p>