title: Makefile, modify list
body: <p>If I have a list in a GNU Makefile, is it possible to create a new list with the original strings modified. This is would be perfect if there was the <code>map</code> higher-order procedure from some languages. </p>
  
  <p>This is an example of what I'm trying to do</p>
  
  <pre><code>DIRS=A B C D
  #apply some magic to create
  DIRS_INCLUDE=-IA -IB -IC -ID
  </code></pre>