as the anonymous monk said, things need to be set up so that the cgi script can see your locally-installed libraries. I know that in my cPanel-based webhost-provider, I have to use cPanelUserConfig; or use a different shebang line, in order for it to know to look in the modules I've installed through cPanel. (see your own webhost-provider's documentation, because your version of cPanel may be different, or you may not be using a cPanel-based system)