OSX 10.8 mountain lion PEAR / PHPUnit not working

I have installed Mountain Lion and I can't get phpunit to work.

$ pear config-get bin_dir
/Users/greg/pear/bin


$cd /Users/greg/pear/bin
$ls 
pear*
peardev*
pecl*
phpunit*

$phpunit
-bash: phpunit: command not found