Hello. The mk.conf(5) is one of those manual pages that are systematically behind. It is generally a nightmare to maintain and the information is duplicated in bsd.README. Possible solutions:
(a) Document the MKx and USEx variables in mk.conf(5) instead of bsd.README. (b) Write a script that parses bsd.README and outputs the information to mk.conf; cf. the idea in iic(4). (c) Make a mk.conf(5) a generic page that points to the corresponding files and related information, maybe with a small example. As I see it, (a) is not probably desirable and (b) is prone to errors. So I would propose (c). Objections? - Jukka.