libudev-dev missing on emdebian squeeze grip

Hi,

while working on a system based on the squeeze variant of Emdebian-Grip we are 
missing libudev-dev.

It'a not contained in grip itself, and libudev-dev from the main dist has a 
same version dependency and does not accept the "164-3em1" provided by Grip.

So I would be glad if someone could point me in the right direction on how to 
proceed here.


Thanks
Heiko