The documentation describing NetBSD kernel configuration mentions that it uses the "option" keyword like OpenBSD, but in fact it uses the "options" keyword like FreeBSD.
http://developer.postgresql.org/docs/postgres/kernel-resources.html#SYSVIPC
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/i386/conf/GENERIC?rev=1.674&content-type=text/x-cvsweb-markup
Kris Jurka