root@TMSvr[/media/VBOXADDITIONS_1.5.6_28296]# ./VBoxLinuxAdditions.run 
Verifying archive integrity... All good.
Uncompressing VirtualBox 1.5.6 Guest Additions for Linux installation.................................................................................................................................................
VirtualBox 1.5.6 Guest Additions installation
Please install the build and header files for your current Linux kernel.
The current kernel version is 2.6.18-elive
Problems were found which would prevent the Guest Additions from installing.
Please correct these problems and try again.


root@TMSvr[/media/VBOXADDITIONS_1.5.6_28296]# sh ./VBoxLinuxAdditions.run 
Verifying archive integrity... All good.
Uncompressing VirtualBox 1.5.6 Guest Additions for Linux installation.................................................................................................................................................
VirtualBox 1.5.6 Guest Additions installation
Please install the build and header files for your current Linux kernel.
The current kernel version is 2.6.18-elive
Problems were found which would prevent the Guest Additions from installing.
Please correct these problems and try again.