FreeBSD 5.3 and XFree86

[Gerard Samuel]

I just upgraded from 5.2.1 to 5.3.  When running startx, it ends up with 
this error ->

Fatal server error:
xf86EnableIO: Failed to open /dev/io for extended I/O

So I uninstalled XFree86, and reinstalled it, while including this in 
/etc/make.conf ->

X_WINDOW_SYSTEM=xfree86-4

XFree86 installed successfully, but Im still getting the error above.
Any suggestions???
Thanks