how to transfer kontakts AddressManager.app -> Apple address book

[Ingolf Jandt]

Hello!

I want to transfer my contacts from my GNUstep/linux desktop pc to my  
new MacBook. -- With minimal efford.
I am sure there is a very straightforward and fast way. Last time I  
did so via the export/import function, but I had to correct many  
entries, and the group structure was lost.

I would be very grateful for a hint to the "right" way.

Ingolf