I've tried to use NO_MAN in a bmake Makefile to declare that there are no manpages to build but I got the following message: make: "/usr/share/mk/bsd.opts.mk" line 100: warning: "NO_MAN is defined, but deprecated. Please use MK_MAN=no instead." We should update our documentation (style.Makefile(5) for sure and maybe other as well) as they still recommend the use of `NO_MAN`.