$ pear install PEAR_Frontend_Web
 downloading PEAR_Frontend_Web-0.3.tgz ...
 ...done: 32,821 bytes
 requires package `Net_UserAgent_Detect'
 PEAR_Frontend_Web: dependencies failed
$ pear install Net_UserAgent_Detect
 downloading Net_UserAgent_Detect-1.0.tgz ...
 ...done: 7,699 bytes
 install ok: Net_UserAgent_Detect 1.0
$ pear install PEAR_Frontend_Web
 downloading PEAR_Frontend_Web-0.3.tgz ...
 ...done: 32,821 bytes
 install ok: PEAR_Frontend_Web 0.3

$ pear uninstall PEAR_Info
 uninstall ok: PEAR_Info

$ pear upgrade HTML_QuickForm
 downloading HTML_QuickForm-3.0.tgz ...
 ...done: 62,379 bytes
 upgrade ok: HTML_QuickForm 3.0