Sounds like another side effect of the /usr/sbin transition. Juan's 
suggestion helped with my nvidia problem 
<https://groups.google.com/forum/#!topic/voidlinux/iZXamHmohQ4>, it might 
work for you as well. Make sure your /usr/sbin directory is a symlink to 
/usr/bin before you do anything else.

- dkms build -m virtualbox-ose -v 5.0.2 -k $(uname -r)
> - dkms install -m virtualbox-ose -v 5.0.2 -k $(uname -r)
> - xbps-reconfigure -f virtualbox-ose
> Before running xbps-reconfigure, make sure the kmods are built and 
> installed correctly.