Run X+ssh on a Fire V120 without video card

Hi,

I just installed OpenBSD 5.0 on a Fire V120 with much satisfaction :)
I'd like to use this machine, among others, to remotely run some X
applications (mostly a browser and some GUI clients) through ssh.
the machine (pizza-box server) does not feature any video card.

Unfortunately, X does not start and gives the following error (over ssh):

$ startx &
xauth:  file /home/user/.serverauth.27809 does not exist
xauth:  file /home/user/.Xauthority does not exist

Fatal server error:
xf86OpenConsole: No console driver found
        Supported drivers: pcvt, wscons
        Check your kernel's console driver configuration and /dev entries

Googling around didn't provide much advice.
What can I do?
Thanks