While you are working on issuing a ticket, could you try the following to see the results:
This will update the PEAR channel.
pear channel-update pear.php.net
Then run this to see if your existing php.ini file might be the cause:
At that point, please try to install the PEAR package to see the results. If it works, then please try the following to see the differences in the two php.ini files:
mv php.ini php.ini.bak120628
diff /usr/local/lib/php.ini /usr/local/lib/php.ini.bak120628