smarty class nonexistent .. having a bad day

[Matt]

geez, i've done this a million times, you'd think i could get it right.
uploading to production server for a new site, and part of the head.inc
that starts everything up looks like this:


echo SMARTY_DIR."Sma rty.class.php<b r>";
require_once(SM ARTY_DIR."Smart y.class.php");

if (substr(phpvers ion(),0,1) == "4") {
$smarty = new Smarty;
// echo "created smarty in php4<br>";
// $smarty->__construct( );
}else{
$smarty = new Smarty();
}

$smarty->template_dir = SMARTY_DIR."tem plates/";
$smarty->compile_dir = SMARTY_DIR."tem plates_c/";
$smarty->config_dir = SMARTY_DIR."con figs/";

-------------------------

It outputs
http://[SITE].com/1.0/smarty/Smarty.class.php
which exists, and contains the class definition.
but then it says;
Fatal error: Cannot instantiate non-existent class: smarty in
/home/.sites/38/site49/web/1.0/head.inc on line 14

line 14 is the one in the PHP 4 loop:
$smarty = new Smarty;
and I've tried
$smarty = new Smarty();
as well

somewher I saw that there is supposed to be a configs/ directory for
smarty, but I don't have one on my local machine and everything works
fine here.