function PEAR_Registry($pear_install_dir = PEAR_INSTALL_DIR, $pear_channel = false,
                           $pecl_channel = false)
    {
        parent::PEAR();
        $this->setInstallDir($pear_install_dir);
        $this->_pearChannel = $pear_channel;
        $this->_peclChannel = $pecl_channel;
        $this->_config      = false;
    }