Verifying archive integrity... All good.
Uncompressing VirtualBox for Linux installation..........
VirtualBox Version 3.0.8 r53138 (2009-10-02T09:30:22Z) installer
Removing previous installation of VirtualBox 3.0.8 r53138 from /opt/VirtualBox
Installing VirtualBox to /opt/VirtualBox
tar: Размер записи = 8 блоков
Python found: python, installing bindings...
Building the VirtualBox vboxdrv kernel module
Failed to build the vboxdrv kernel module.
Please check the log file /var/log/vbox-install.log for more information.
VirtualBox has been installed successfully, but the kernel module could not
be built. When you have fixed the problems preventing this, execute
/etc/init.d/vboxdrv setup
as administrator to build it.
You will find useful information about using VirtualBox in the user manual
/opt/VirtualBox/UserManual.pdf
and in the user FAQ
http://www.virtualbox.org/wiki/User_FAQ
We hope that you enjoy using VirtualBox.
* Stopping VirtualBox kernel module... [ ok ]
* Recompiling VirtualBox kernel module...
* Look at /var/log/vbox-install.log to find out what went wrong
make KBUILD_VERBOSE=1 -C /lib/modules/2.6.31-sabayon/build SUBDIRS=/tmp/vbox.3 SRCROOT=/tmp/vbox.3 modules
make[1]: *** Нет правила для сборки цели `modules'. Останов.
make: *** [vboxdrv] Ошибка 2
Обновите дерево portage. 3.0.8 там есть.
Если у вас там своё дерево в сабайон, скопируйте в локальной оверлей ебилд и обновите его версию + ebuild digest.