install virtualbox problem : Failed, trying without DKMS

kuraush VirtualBox-4.1.4-74291-Linux_x86 # sh VirtualBox-4.1.4-74291-Linux_x86.run 
Verifying archive integrity... All good.
Uncompressing VirtualBox for Linux installation...........
VirtualBox Version 4.1.4 r74291 (2011-10-03T14:55:25Z) installer
Removing previous installation of VirtualBox 4.1.4 r74291 from /opt/VirtualBox
Installing VirtualBox to /opt/VirtualBox
Python found: python, installing bindings...
Building the VirtualBox kernel modules
 * Failed, trying without DKMS
VirtualBox has been installed successfully.

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.

install the package:

emerge -a app-emulation/virtualbox-bin

add yourself to vboxusers group:

gpasswd -a kuraush vboxusers

if you were not in the group need to reconnect to the session

load module:

modprobe vboxdrv

run:

Menu -> System -> Oracle xVM VirtualBox

Enjoy

thanks Alexander Tratsevskiy.solve problem