Cisco VPN on Zaurus wPocketworkstation

Hi List .... my first post here ...hope you can help ...

I successfully installed debian (sarge) on my Zaurus c860(Cacko1.23).
However I am not able to use vpnc to connect to my universities CISCO 
VPN Client.
So I thought if it might be possible to install the original cisco 
vpn-client on debian ...

however ... i installt gcc and the kernel-headers and the 
installation-process fails with "Failed to make module "cisco ipsec" ...

could someone give me a hint if it is possible to build the client and 
if yes, how ?!

Thanks.

greetings
Thomas