If it's not running for you even PEAR installed try to make an upgrade of PEAR (pear upgrade PEAR).
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add a note User Contributed Notes PECL 扩展库安装
kis at grosshat dot com 04-Jun-2008 08:52
rbemrose at gmail dot com 17-Mar-2007 06:04
If you are using a Debian sarge system (currently the stable release) with php4-pear installed, you will still not have a pecl command.
The fix to this is to upgrade pear.
Unfortunately, pear upgrade PEAR will also error out stating that you need pear-1.3.3 minimum.
The fix to this is to specify the version of pear that you want to install. In case it wasn't obvious, that means you want to
pear upgrade PEAR-1.3.3