Some PEAR installations on PHP 5.2.9 and 5.2.10 seem to be corrupted. When trying to install something, you will get the error:
pear.php.net is using a unsupported protocal – This should never happen. install failed
This problem comes from corrupted channel files. Go into your PEAR php directory and backup .channels directory:
cd `pear config-get php_dir`
mv .channels .channels-broken
This means you lost all your channels except for the default ones (pear, pecl, doc and __uri) – but at least you do not have to re-install PEAR.
Sorry for the inconvenience.