e | port | brew] install [tesseract | tesseract-ocr]</tt><br />
        Without Tesseract installed, you'll still be able to extract text from
        documents, but you won't be able to automatically OCR them.
      </li>
      <li>
        (Optional) Install <a href="http://www.accesspdf.com/pdftk/">pdftk</a>.
        On Linux, use <b>aptitude</b>, <b>apt-get</b> or <b>yum</b>:<br />
        <tt>aptitude install pdftk</tt><br />
        On the Mac, you can <a href="https://www.pdflabs.com/tools/pdftk-serv