ad@netbsd.org said:
> Any reason why these shouldn't be combined into one opt_wscons.h? It's
> a bit of mish-mash at the moment. 

It's rather well-sorted actually:

-opt_wsemul.h tells which terminal emulations are compiled in
-opt_wskernattr.h controls the appearance of kernel printf()s
-opt_wsdisplay_compat.h contains everything related to (backward)
 compatibility

They affect mostly different sets of files, so it avoids
needless recompilations.

best regards
Matthias