title: Creating debug build of autotools' build source
body: <p>Given:</p>
  
  <ul>
  <li>source tar.gz </li>
  <li>AFAIK, <em>configure</em> does support debug build (<em>configure --help</em> doesn't show <em>--enable-debug</em>)</li>
  </ul>
  
  <p>Questions:</p>
  
  <ul>
  <li>Is it safe to use debug build if the authors of the package didn't supplied it in the first place? </li>
  <li>If the answer to pre.v question is yes, than how I can produce debug build? Should I patch <em>configure.ac</em>?</li>
  </ul>
  
  <p>Thanks</p>