about the installation of VPN under Mandrake Linux 9.1


in the NUS VPN FAQ page, there is one instuction for it


"For people running their own kernel, they must use the build tree from
their running kernel to build the client. Unpacking the source code for the
version of the kernel they are running is insufficient. The module build
process must use the same configuration information as their running kernel,
and the only way to get that information is from the directory tree that was
used to build the running kernel."


but mine problem is similar to this, it just say something something blah blah is not declered, or header errors, something like this

and

how can i "get that information is from the directory tree that was
used to build the running kernel"

?

anyone successfully installed VPN client in Mandrake 9.1 ?
THanks a billion~~~