could not install route_check

[peppeCook]

I searched to install the route_check module in my pc, I run ubuntu 10.04 kernel v2.6, when i prove to install the module and type the make command i received some errors, I resolved more of there changed the path in MakeFile but i could not install the route_check module because i received other errors such as
error: invalid use of undefined type ‘struct nf_hook_ops’

I tried to install the module route_check in my pc, I ran 10.04 kernel v2.6, when I try to install the module and I type the make command received some errors, I fixed some errors by changing the path in makefile but I could not install the form route_check because I received other errors as
error: invalid use of undefined type 'struct nf_hook_ops'

where is the problem?

Thanks!