VPN and Linux -- Help!!

Hi y'all, I'm currently running Suse 6.4 but i'm about to compile a 2.2.19 (got the source from Suse FTP server). However, accoording to http://www.impsec.org/linux/masquerade/ip_masq_vpn.html i have to include the available patch. I have applied the patch but kernel compilation throws up errors. Has anybody gone through this or is familiar with this process and could lend ma a hand? I want to use VPN to connect to a VPN server running on Windows 2000. I do *not* plan to set up a VPN server of my own.

Clifford Okoro