testbox:/# dpkg -l | grep php
ii  php4-cli       4.3.10-18      command-line interpreter for the php4 script
ii  php4-common    4.3.10-18      Common files for packages built from the php
ii  php4-gd        4.3.10-18      GD module for php4
ii  php4-pear      4.3.10-18      PEAR - PHP Extension and Application Reposit

testbox:/# pear install -af Text_CAPTCHA
Warning: Text_CAPTCHA is state 'alpha' which is less stable than state 'stable'
downloading Text_CAPTCHA-0.2.1.tgz ...
Starting to download Text_CAPTCHA-0.2.1.tgz (13,739 bytes)
.....done: 13,739 bytes
downloading Text_Figlet-1.0.0.tgz ...
Starting to download Text_Figlet-1.0.0.tgz (23,592 bytes)
...done: 23,592 bytes
No handlers for package.xml version 2.0