VirtualBox guest and clipboard sharing

[noone]

I have set bidirectional clipboard sharing set up. However the setting does not work.

Slackware is VM Host

Funtoo is VM Guest.

This setup worked before.

The difference is that this time I have installed only VirtualBox Guest Additions in Funtoo. Previously, in addition to VirtualBox Guest Additions, I had installed in Funtoo Guest:

VirtualBox (for Host ), VirtualBox Modules (for host) and VirtualBox Guest Additions.

Do I need to install VirtualBox (for Host ), VirtualBox Modules (for host) in Funtoo?

My other VirtualBox Guests (linux distros, FBSD and OpenIndiana) require only VirtualBox Guest Additions for full VM host/guest interoperability.

Thank you.