LinuxQuestions.org - Cisco VPN Client Installation Issue on Knoppix kernel 2.6.17

Hi everybody,

This is what I received this time when I tried to install the new version of CISCO VPN CLIENT Version 4.8.00 (0490)
VPN:root@vampirebox:/home/vdrakula/VPN_LINUX/vpnclient# ./vpn_install
Cisco Systems VPN Client Version 4.8.00 (0490) Linux Installer
Copyright (C) 1998-2005 Cisco Systems, Inc. All Rights Reserved.

By installing this product you agree that you have read the
license.txt file (The VPN Client license) and will comply with
its terms.

Directory where binaries will be installed [/usr/local/bin]

Automatically start the VPN service at boot time [yes]

In order to build the VPN kernel module, you must have the
kernel headers for the version of the kernel you are running.

Directory containing linux kernel source code [/lib/modules/2.6.17/build]

* Binaries will be installed in "/usr/local/bin".
* Modules will be installed in "/lib/modules/2.6.17/CiscoVPN".
* The VPN service will be started AUTOMATICALLY at boot time.
* Kernel source from "/lib/modules/2.6.17/build" will be used to build the module.

Is the above correct [y]

Making module
make -C /lib/modules/2.6.17/build SUBDIRS=/home/vdrakula/VPN_LINUX/vpnclient modules
make[1]: Entering directory `/usr/src/linux-2.6.17'
Makefile:266: /usr/src/linux-2.6.17/scripts/Kbuild.include: No such file or directory
Makefile:486: /usr/src/linux-2.6.17/arch/i386/Makefile: No such file or directory
make[1]: *** No rule to make target `/usr/src/linux-2.6.17/arch/i386/Makefile'. Stop.
make[1]: Leaving directory `/usr/src/linux-2.6.17'
make: *** [default] Error 2
Failed to make module "cisco_ipsec.ko".

I have spent a lot of time to investigate this issue on Google and also asking my linux friend.
Would be anybody such a nice and advice to me in detail how to set it up?
Thank you in advance.
Best Rgds from Prague
Jaromir