Pear install PhpDocumentor in SSH

I’ve shelled into my shared hosting acccount and was able install PEAR but once I have confirmed that, I then proceeded to have phpDocumentor install in the following manner:

$ pear install PhpDocumentor

Once I hit enter, I get the following:
WARNING: “pear/PhpDocumentor” is a deprecated in favor of “channel://"
WARNING” channel “ has updated its protocols, use the pear channel-update” to update
Cannot install, php_dir for channel “” is not writable by the current user

when that failed, the I proceeded to use sudo as follows:
$ sudo pear install PhpDocumentor
then it would ask for password, which I then would enter and returns with, "fumacigar is not in the sudoers file. This incident will be reported.

The install of Phpdocumentor should be able to isntall, would I need to have my status writable in order to have this installed ??

Thanks anyone!