This package requires PHP 5.x and the following PHP Pear libraries: - DB_DataObject - Validate - XMLWriter - Auth_Yadis from OpenIDEnabled (not the PEAR version!). I decided to use the openidenabled.com version since it's more widely implemented, seems to be better supported, and it may make sense to use the openidenabled.com libraries for OpenID auth sometime in the future. Note that this is no longer distributed separately; it's only in the openidenabled.com OpenID PHP tarball.