trollboy@ubuntu:~$ cd /home/trollboy/vpn/vpnclient/
trollboy@ubuntu:~/vpn/vpnclient$ sudo ./vpn_install
Cisco Systems VPN Client Version 4.0 (Rel) Linux Installer
Copyright (C) 1998-2001 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] no

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

For RedHat 6.x users these files are installed in /usr/src/linux by default
For RedHat 7.x users these files are installed in /usr/src/linux-2.4 by default
For Suse 7.3 users these files are installed in /usr/src/linux-2.4.10.SuSE by default

Directory containing linux kernel source code [] /usr/src

* Binaries will be installed in "/usr/local/bin".
* Modules will be installed in "/lib/modules/2.6.15-27-386/CiscoVPN".
* The VPN service will *NOT* be started automatically at boot time.
* Kernel source from "/usr/src" will be used to build the module.

Is the above correct [y] y

Making module
In file included from linuxcniapi.c:14:
/usr/include/linux/config.h:1:2: error: #error "Compilation aborted. Please read the FAQ for linux-libc-headers package."
/usr/include/linux/config.h:2:2: error: #error "(can be found at http://ep09.pld-linux.org/~mmazur/linux-libc-headers/doc/)"
In file included from linuxcniapi.c:25: