checking "how to check if pid exists"... configure: error: Could not find the right ps and/or grep switches. MySQL编译错误解决方法

调试LNMP时安装MySQL出现如下错误：

checking "how to check if pid exists"... configure: error: Could not find the right ps and/or grep switches. Which OS is this?  See the Installation chapter in the Reference Manual.

解决方法：
mount -t proc proc /proc
执行之后提示：mount: proc already mounted
再重新编译，问题已经解决。