I just committed a change to conf/files and dev/ic/aic7xxxvar.h to add
a defopt which creates opt_ahc.h to hold a bunch of ahc-specific
#defines.  (AHC_DEBUG, AHC_TAGENABLE, AHC_BROKEN_CACHE).

If you have any ahc scsi controllers listed in your kernel config, you
should re-run config and `make depend' once these changes show up in
your source tree; if you don't, aic7xxx.c and perhaps a few other
files will fail to compile because they can't find `opt_ahc.h'.

					- Bill