Upgrading PEAR from 1.9.1 to 1.9.4 on a shared server to install PHPUnit

Is this even possible? I’ve tried every single command for the past 7 hours and I just can’t get it.

Ultimately, I want to install PHPUnit 3.5 or 3.6. When I try to install PHPUnit, it complains:

How can I get PHPUnit to work on a shared server? Thanks!