title: Configuration error when installing R on Linux
body: <p>Steps to install:</p>
  
  <ol>
  <li>./configure --enable-R-shlib</li>
  </ol>
  
  <p>I get this error:</p>
  
  <pre><code> configure: error: --with-x=yes (default) and X11 headers/libs are not available
  </code></pre>
  
  <p>in config.log file
  I see this entry:</p>
  
  <pre><code> #define X_DISPLAY_MISSING 1
  </code></pre>
  
  <p>any ideas?</p>