Fatal Error in ZEND

Fatal error: Call to undefined function iconv_strlen() in /var/www/html/omeka/application/libraries/Zend/Validate/StringLength.php on line 212

What I am doing -
Trying to install and run Omeka in a Virtual Box
I have Mandriva 2010 installed, and basic LAMP

Did I miss a step in the setup for Omeka...
Any help would be great...

iconv_strlen() is a PHP5 function. do you have at least PHP 5.2.4 installed (minimum required for Omeka)?