The current focus is on the native code generation.
To build this project, you need CMake. It is fantastic btw. :-)
Then you need to build LLVM in your platform (just once):
cd <kunjs-project-dir> mkdir -p build/llvm cd build/llvm cmake ../../utils/llvm make
After you have built the LLVM project, you will be able to build everything else:
cd <kunjs-project-dir> cmake . make
After this first build, you do not need to generate CMake files again.
make in the project root dir is enough.
I strongly recommend you to take a look on some of the tests:
Executables for each of them are generated in the top level directory.