installation issue

Hi all, i'm trting to install pear on a debian system and i run into a problem (must be stupid...). as i couldn't install the pear package manager thanks to the online script (when i run lynx -source http://go-pear.org | php i got the following error : bash: php: command not found) I've installed php4-pear thanks to apt-get The problem is that when i go into the pear install directory (which is /usr/bin) and i run pear i got the following error : bash: /usr/bin/pear: /usr/bin/php4: bad interpreter: Aucun fichier ou répertoire de ce type (file not found in english) which is normal since php4 is installed in this directory : /usr/lib/php4 I've tried to create a link to the php4 install folder in the /usr/bin/ folder like this : ln -s /usr/lib/php4 php4 but it still fails with the following error : bash: /usr/bin/pear: /usr/bin/php4: bad interpreter: Permission non accordée (permission denied) what can i do? Is there something i can change in the pear file to make it work? Thanks Gregory