在virtualbox安装了centOS，想安装增强功能时，系统提示:

building the main Guest Additions module Failed

于是尝试了以下两步操作：

(1)yum install gcc kernel-devel kernel-headers

(2)yum update kernel

重新运行增强包中autorun.sh时，提示错误：

The missing package can be probably installed with 
yum install kernel-devel-2.6.18-308.16.1.el5.i686

于是重新执行命令:

yum install kernel-devel-2.6.18-308.16.1.el5.i686 

再次运行autorun.sh，操作成功。重启centOS后，增强功能生效。