I've finally had the chance to really take a look at this.

It turns out that there are a fair number of port that don't declare the 
`dkn' variable:

	alpha
	amiga
	atari
	mac68k
	sun3
	vax

My first inclination is to add dkn to the autoconf.c of the above ports, 
but I'd appreciate a little input on it first.

--------------------------------------------------------------------------
Jason R. Thorpe                                       thorpej@nas.nasa.gov
NASA Ames Research Center                               Home: 408.866.1912
NAS: M/S 258-6                                          Work: 415.604.0935
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