No devices/nodes/files in /dev after building and installing world

Hi all,

I'm currently stuck on the following. Haven't built HEAD in a while, and 
now after a

make buildworld kernel installworld distrib-dirs distribution

I don't have any nodes in /dev at all. As far as I remember there was 
always a minimum set of nodes in there, like ttys etc.

What happened? Which changes did I miss?

Cheers,

Mat