gentoo开机和运行某些程序时，经常出现如下提示：

* Use of the opts variable is deprecated and will be
* removed in the future.
* Please use extra_commands or extra_started_commands.

从这篇文章中找到解决办法：

sed -e 's:opts=:extra_commands=:g' -e 's:${opts}:${extra_commands}:g' -e 's:$opts:$extra_commands:g' /etc/init.d/* -i