Verifying archive integrity... All good.
Uncompressing VirtualBox 1.5.2 Guest Additions for Linux installation................................................................................................................................................
VirtualBox 1.5.2 Guest Additions installation
Please install the build and header files for your current Linux kernel.
The current kernel version is 2.6.22.5-31-default
Please install the GNU compiler.
Problems were found which would prevent the Guest Additions from installing.
Please correct these problems and try again.