Xinerama Support in kde 3.1.3 unstable tree

["Reto Spoerri" <rspoerri@nouser.org>]

Hello,

I've setup my Computer with Xinerama and found an option in kde Control
Center (Desktop -> Window Behavior -> Advanced) "Enable Xinerama support"
but i cant enable it (it's gray). Anybody knows what i can do to get this
option available?

Thx in advance

Reto