Error in install of Virtualbox guest additions in CentOS

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http://www.linuxquestions.org – Hello, I have installed CentOS 64 bit in VirtualBox. When I try to install VirtualBox additions, I get an error log. Code: Creating user for the Guest Additions. Creating udev rule for the Guest Additions kernel module. /tmp/vbox.0/Makefile.include.header:97: *** Error: unable to find the sources of your current Linux kernel. Specify KERN_DIR=<directory> and run Make again. Stop. I am not able to figure it out. Kindly help if anyone has an idea. Thanks. (HowTos)