I’m probably not paying enough attention to new developments in FreeBSD after all. After updating the installed ports in my VMs running
base/stable/10, X11 stopped working. It turns out the new version of X.org requires KMS and what not in the kernel. This doesn’t fare well with VMs running inside VirtualBox.
The solution? Place
/etc/make.conf file and recompile everything, or at least recompile everything belonging to the X.org subsystem. I opted for the former, spending roughly five hours recompiling 443 ports.