wrong kernel option at handbook

[Pablo Carboni]

Dear Sir,

My name is Pablo Carboni and I'm from Buenos Aires, Argentina.

I'm sending this email, because the url:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/linuxemu-lbc-
install.html,

where says "options LINUX", in order to compile linux compatibility code, I'm having 
problems to do a 'config <kernelname>'; but with "options COMPAT_LINUX", I've  
compiled my kernel fine without any problem.(The first item says Unknown option).
(I'm sorry for my very bad English)
Pablo.
[gervi at ciudad.com.ar]
P.S.: I've have a FreeBSD v4.9 box.