or v6.81 and higher
<BR>
<ul><li>If you are upgrading from a version lower than v6.81, the environment and external functions must be re-installed for this release.

<li>If you have your own external functions, you must re-compile them using gfortran and the flags for compiling code to run as double precision. See the v6.81 release notes and the External Functions documentation pages.
</ul></i></B>

<p><b><u><font size="+1">Installation Instructions</font></u></b></p>

<ul>
  <li><a href="./ferret_installat