private function loadExtLocalconfForExtension($extensionKey)
    {
        $extensionInfo = $GLOBALS['TYPO3_LOADED_EXT'][$extensionKey];
        // This is the main array meant to be manipulated in the ext_localconf.php files
        // In general it is recommended to not rely on it to be globally defined in that
        // scope but to use $GLOBALS['TYPO3_CONF_VARS'] instead.
        // Nevertheless we define it here as global for backwards compatibility.
        global $TYPO3_CONF_VARS;
        $_EXTKEY = $extensionKey;
        if (isset($extensionInfo['ext_localconf.php']) && $extensionInfo['ext_localconf.php']) {
            // $_EXTKEY and $_EXTCONF are available in ext_localconf.php
            // and are explicitly set in cached file as well
            $_EXTCONF = $GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'][$_EXTKEY];
            require $extensionInfo['ext_localconf.php'];
        }
    }