function addConfigureOption($name, $prompt, $default = null)
    {
        if ($this->getPackageType() != 'extsrc' && $this->getPackageType() != 'zendextsrc') {
            return false;
        }

        $r = &$this->_getCurrentRelease(false);
        if ($r === null) {
            return false;
        }

        $opt = array('attribs' => array('name' => $name, 'prompt' => $prompt));
        if ($default !== null) {
            $opt['attribs']['default'] = $default;
        }

        $this->_isValid = 0;
        $r = $this->_mergeTag($r, $opt,
            array(
                'configureoption' => array('binarypackage', 'filelist'),
            ));
    }