Hi,
Your system kernel is too new for install the bristuff drivers. Here are 3 ways to solve the problem:
1.Give me your Email, I will send you a version of bristuff which was modified for the new kernel.
2.Use the dahdi drivers to install G400P, you can refer
http://www.chan-extra.org/index.php/OpenVox_G400P_User_Manual_for_dahdi
3.Changge you OS.