PEAR question

I can't seem to use any of the PHP PEAR packages except DB. Everytime I try to include the necessary include file, it tells me it can't find it. It doesn't seem to have any trouble finding DB.php though. I'm really confused.

 array("Stig", "Bakken"), 
    "1" => array("Martin", "Jansen"), 
    "2" => array("Alexander", "Merz") 
  ); 

  $tpl = new HTML_Template_IT("./templates"); 

  $tpl->loadTemplatefile("main.tpl.htm", true, true); 

  foreach($data as $name) {
    foreach($name as $cell) {
        // Assign data to the inner block 
        $tpl->setCurrentBlock("cell") ;
        $tpl->setVariable("DATA", $cell) ;
        $tpl->parseCurrentBlock("cell") ;
    }
    // Assign data and the inner block to the 
    // outer block
    $tpl->setCurrentBlock("row") ;
    $tpl->parseCurrentBlock("row") ;    
  }
  // print the output
  $tpl->show(); 

?>

Obviously, this was cribbed from the PEAR website example. Can anyone tell me what I'm doing wrong? I keep getting this error:

Warning: main(HTML/Template/IT.php): failed to open stream: No such file or directory in /home/fiona/vrp/fitp/template_test.php on line 2

Fatal error: main(): Failed opening required 'HTML/Template/IT.php' (include_path='.:/usr/share/php:/usr/share/pear') in /home/fiona/vrp/fitp/template_test.php on line 2

Edit:

Haha, I'm a dork. I didn't realise that "pear rl" listed all the remote packages available, not the ones that are actually installed on the system. Turns out the package I wanted wasn't installed anyway.

Feh. Thanks for your help guys.