  be similar in spirit to the present version, but may differ in detail to
    address new problems or concerns.</p>

<p>Each version is given a distinguishing version number.  If the
    Program specifies that a certain numbered version of the GNU General
    Public License &ldquo;or any later version&rdquo; applies to it, you have the
    option of following the terms and conditions either of that numbered
    version or of any later version published by the Free Software
    Foundation.  If the Program d