vpn client 安装报错，帮看看阿

[javafan]

oot@sjk-desktop:/home/sjk/桌面/vpnclient# ./vpn_install
Cisco Systems VPN Client Version 4.8.01 (0640) Linux Installer
Copyright (C) 1998-2006 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]y

Directory "y" doesn't exist. Create ? [y]/usr/loca/vpn

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

Automatically start the VPN service at boot time [yes]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/2.6.24-23-generic/build]

* Binaries will be installed in "/usr/local/vpn".
* Modules will be installed in "/lib/modules/2.6.24-23-generic/CiscoVPN".
* The VPN service will be started AUTOMATICALLY at boot time.
* Kernel source from "/lib/modules/2.6.24-23-generic/build" will be used to build the module.

Is the above correct [y]y

Making module
make -C /lib/modules/2.6.24-23-generic/build SUBDIRS=/home/sjk/桌面/vpnclient modules
make[1]: 正在进入目录 `/usr/src/linux-headers-2.6.24-23-generic'
scripts/Makefile.build:46: *** CFLAGS was changed in "/home/sjk/桌面/vpnclient/Makefile". Fix it to use EXTRA_CFLAGS。 停止。
make[1]: *** [_module_/home/sjk/桌面/vpnclient] 错误 2
make[1]:正在离开目录 `/usr/src/linux-headers-2.6.24-23-generic'