Cisco Secure VPN Client + Kernel 2.4.18 problems

Anyone having problems running the Cisco Secure VPN Client?

I managed to compile the client with kernel 2.4.18 after some tweaks. But when I try to do /etc/init.d/vpnclient_init start, it gives a list of unresolved symbols and a rude message:

"Hint: You are trying to load a module without a GPL compatible license and it has unresolved symbols. Contact the module supplier for assistance, only they can help you.".

I patched the kernel with Alan Cox's patch, added MODULE_LICENSE("GPL"); to interceptor.c, included modversions.h, and compile. Now it doesn't complain about the non-gpl module, and tainting the kernel. It gives me:

hera:/home/eugeneteo/vpnclient# /etc/init.d/vpnclient_init start
Starting /usr/local/bin/vpnclient: /lib/modules/2.4.18ph33r/CiscoVPN/cisco_ipsec: unresolved symbol eth_type_trans_Rfe00066c
/lib/modules/2.4.18ph33r/CiscoVPN/cisco_ipsec: unresolved symbol skb_under_panic_R06b7035a
/lib/modules/2.4.18ph33r/CiscoVPN/cisco_ipsec: unresolved symbol __kfree_skb_Reb566d01
/lib/modules/2.4.18ph33r/CiscoVPN/cisco_ipsec: unresolved symbol skb_over_panic_Rd8af2421
/lib/modules/2.4.18ph33r/CiscoVPN/cisco_ipsec: unresolved symbol dev_add_pack_R0cf16363
/lib/modules/2.4.18ph33r/CiscoVPN/cisco_ipsec: unresolved symbol dev_remove_pack_R4f527df9
/lib/modules/2.4.18ph33r/CiscoVPN/cisco_ipsec: unresolved symbol dev_base_Rf297d085
/lib/modules/2.4.18ph33r/CiscoVPN/cisco_ipsec: unresolved symbol alloc_skb_R5df9c89c
Failed (insmod)
hera:/home/eugeneteo/vpnclient#

Any idea? Any similar experiences? Anyone manage to fix the problem?