thanks very much for your answer;
I 've tried what you say : in php.ini, include_path.:/tmp:/usr/local/lib/php after a mkdir php (in the /usr/local/lib directory) with the right user permissions (is 'chmod -R o+rwx /usr' sufficient I know it can be risky in a LAN or multi-user environnement ?) ;
but it doesn't work (after an apachectl graceful (or restart) php says :
Fatal error:Failed opening required ...
so (desesperatly, I 've done 'locate /lib/php' and the result is /usr/lib/php4
so in my php.ini, include_path .:/tmp:/usr/lib/php4 (I've given the right permissions to the directory and files.apachectl graceful...and php says the same.
so I've tried in my php.ini, include_path .:/usr/lib/php4, given the right permissions, apachectl restart, ... php says the same
so I've given up ...😕