[kde-freebsd] Superkaramba transparancy

My superkaramba themes are not transparent, like in KDE3.

When I try to enable desktop effects, I get an error dialog:
Failed to activate desktop effects using the given configuration options. 
Settings will be reverted to their previous values.

Check your X configuration. You may also consider changing advanced options, 
especially changing the compositing type.

Where are these options?
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