addReplacement with Role_Web

I've got a PHP file in a PEAR package with something like: require '/path/to/mysoftware/config.php'; The PEAR package installs as a web application using pearified/Role_Web and what I'd like to do is during the install prevent users from having to touch the file that has that include above to use the right absolute path. I tried using the following in my packagefilemanager script: $pkg->addReplacement( 'public_html/file-to-edit.php', 'pear-config', '/path/to/mysoftware', 'web_dir' ); Problem is that my web application installs into it's own directory under the web_dir so what I get after the above substitution is: require '/var/www/config.php'; instead of: require '/var/www/packagename/config.php'; I then tried to do a second substitution (that happens after the above substitution: define('CONFIGSTR','packagename/config.php'); $pkg->addReplacement( 'public_html/file-to-edit.php', 'php-const', 'config.php', CONFIGSTR ); ...but that gives me errors because addReplacement only allows actual PHP constants, not user defined constants. Is there an easy way around this? --Tony