This is probably a really stupid question, but I can seem to figure this
out: some kernel source files have #include lines such as #include
"opt_ns.h" or #include "opt_iso.h". What are these opt_xxx.h files, and
where are they in the source tree? (I'm looking at some files from freebsd
and these have some other opt_xxx.h files and since I don't know what these
are, and can't find them, I can't figure out how easy it would be to add
support for this subsystem to NetBSD.) Thanx, Ed