strange kernel option USER_LDT suggested in wine doc

[DG]

Greetings,

I installed the wine port onto FreeBSD 5.1-RELEASE and noted that the doc
suggested the following:

"To use Wine, your kernel must be rebuilt with the following lines added
to the kernel config file (/sys/i386/conf/<YourMachine>):

options		USER_LDT
options		SYSVSHM
options		SYSVSEM
options		SYSVMSG"

The latter 3 are selected by default in my config file, but when I add the
USER_LDT line and run config, I get the following output:

ROWDY2: unknown option "USER_LDT"

Is this option maybe depracated in 5.1?

Thanx

Dave