After upgrading to OSX 10.7, I discovered that both PEAR and PECL had gone. After some considerable searching online Ruggero De Pellegrini on Google+, so I’m putting it here for anyone who needs it (including myself when I get a new mac).
Download the installer "curl http://pear.php.net/go-pear.phar > go-pear.php" Start the installation "sudo sudo php -q go-pear.php" Press 1 and "installation base ($prefix)" and change it to /usr/local Press enter and continue. Copy the default php.ini file "sudo cp /etc/php.ini.default /etc/php.ini" In /etc/php.ini change the include_path = ".:/usr/local/share/pear"
Type pecl or pear in Terminal.app and see if it works.