You necessarily need X.org 6.8 or later to have kompmgr work. X.org 6.7 or older or XFree86 won't work.
You need to explicitly enable the Composite extension. Add a new Section to your X.org configuration file:
Section "Extensions" Option "Composite" "Enable" EndSection
If supported by your GPU (the complex chip that powers a modern graphics card), activate the Render acceleration. This is best supported by NVIDIA™, and less completely by ATI cards.
Section "Device" .... .... Option "RenderAccel" "true" .... .... EndSection
kompmgr should be available now. For more information, please see the FAQ.
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