centos6.7 安装virtualbox及相关

参考：http://www.centoscn.com/image-text/install/2015/0512/5405.html
安装virtualbox:
1:下载VirtualBox的RHEL软件库配置文件：
 wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo
2:安装RPMForge RPMForge也是CentOS官方社区推荐的第三方yum源
rpm -ivh rpmforge-release-0.5.2-1.el6.rf.i686.rpm
官方网站为：   
forge-release软件下载页为： 3:安装DKMS（Dynamic Kernel Module）
yum install dkms
 4:安装开发环境和内核： 
yum groupinstall "Development Tools"
yum install kernel-devel
5:安装qt和qt-  
yum install qt qt-x11 
6：下载安装VirtualBox
先在官网下载下来 

7 安装扩展：   未验证
 VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-4.3.16-95972.vbox

VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ExtPackFile, interface IExtPackFile, callee nsISupports
VBoxManage: error: Context: "Install(fReplace, NULL, ptrProgress.asOutParam())" at line 1140 of file VBoxManageMisc.cpp

但此时系统中已有virtualbox了，所以说这个问题可以忽略，继续接下来的。
8 /etc/init.d/vboxdrv setup    未验证

这里又出现了错误：

Building the VirtualBox Guest Additions kernel modules [FAILED] 
Your system does not seem to be set up to build kernel modules. 
Look at /var/log/vboxadd-install.log to find out what went wrong. 
Once you have corrected it, you can run /etc/init.d/vboxadd setup to build them. 
查看错误日志：
/tmp/vbox.o/Makefile.include.header:97: *** 
Error: unable to find the source of your current Linux kernel.Specify KERN_DIR= and run make again. Stop.

    解决办法：
yum install kernel
yum install kernel-devel
yum install kernel-headers
yum install gcc*
yum install make 
reboot

/etc/init.d/vboxdrv setup