igb doesn't compile in STABLE?

[gnn at freebsd.org]

At Mon, 14 Jul 2008 14:53:16 -0700,
Jack Vogel wrote:
> 
> Just guessing, did someone change conf/files maybe??
> 

If you build a STABLE kernel with igb AND em then things work and the
kernel uses em.

I'm not sure which thing needs to be changed in conf/files or
otherwise though.

Later,
George