[Newbie]Failure to open /dev/io on config set up

[Joseph Maxwell]

Hello,
Xfree86 4.1.0 set up on FreeBSD 4.2 O/S ==> failure to open /dev/io on config set up
Can anyone suggest a solution.

Actual error message :

Fatal server error
xf86 Enabled IO: failed to open /dev/io for extended I/O

Thanks
--  Joe  --