virtual box guest addition sources

[stranger_nub]

I have installed Linux guest OS on VirtualBox. The Linux guest kernel is custom built on host and image is launched on VirtualBox.
Hence the Linux guest OS do not have required support to run the VirtualBox guest additions scripts directly.

So i am trying to build the VirtualBox guest addition sources on host OS and deploy the kernel modules and libraries on the guest Linux.
I found the source for building kernel modules. But the library sources are not available in VirtualBoxGuest Additions iso.

How can i get:
1. Library sources
2. Apart from deploying the kernel modules and libraries on guest OS, what other dependencies needs to be addressed to have all guest addition features on the Linux guest.

Any inputs would be helpful

[Twisted Lucidity]

Check the downloads page, it links to the sources and I think this is what you want

[stranger_nub]

Thank you. But i still did not find the sources which create for eg. VBoxOGL.so.

Is VBoxOGL.so equivalent to libGL.so? What is missing if they are not same?