virtualbox安裝centos 6 加強工具提示「Unable to find the ker

virtualbox安裝centos 6之加強工具時，在錯誤日誌中會提示：unable to find the source of your current linux kernel

#sudo sh ./VBoxLinuxAdditions.run 

提示失敗 

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. 

#gedit /var/log/vboxadd-install.log 內容 

Makefile:23: *** Error: unable to find the sources of your current Linux kernel. Specify KERN_DIR=<directory> and run Make again.. Stop. 
Creating user for the Guest Additions. 
Creating udev rule for the Guest Additions kernel module. 

安裝GCC 

#yum install gcc 

# yum install gcc kernel-devel kernel-headers 

重啓。 

再次安裝VBoxLinuxAdditions，OK。

注意須要以Root身份運行，不然會提示權限不夠。

即使按此操做依舊安裝失敗。繼續找緣由。

須要設置KERN_DIR環境變量

好吧，安裝的KERN版本爲2.6.32-358.23.2.el6.x86_64，但不知爲什麼系統變量即便設置爲如上目錄，Linux依舊尋找這個版本

2.6.32-358.el6.x86_64

試着將它複製一份，到2.6.32-358.el6.x86_64目錄，再次運行，安裝成功。！