The buildrump.sh script is a tool for (cross-)building kernel drivers as rump kernels for a variety of platforms, for example a POSIX-type userspace. There are practically no dependencies apart from a working toolchain. When invoked without parameters, buildrump.sh will download the necessary source code, build the kernel drivers, and run a number of tests:

./buildrump.sh

See the wiki for more information and further instructions.