SELinux
If you want to use SELinux, chances are you will want to use the distro-provided policies, or install the latest reference policy release from
http://oss.tresys.com/projects/refpolicy
However, if you want to install a dummy policy for testing, you can do using mdp provided under scripts/selinux. Note that this requires the selinux userspace to be installed - in particular you will need checkpolicy to compile a kernel, and setfiles and fixfiles to label the filesystem.
Compile the kernel with selinux enabled.
Type make to compile mdp.
Make sure that you are not running with SELinux enabled and a real policy. If you are, reboot with selinux disabled before continuing.
Run install_policy.sh:
cd scripts/selinux sh install_policy.sh
Step 4 will create a new dummy policy valid for your kernel, with a single selinux user, role, and type. It will compile the policy, will set your SELINUXTYPE to dummy in /etc/selinux/config, install the compiled policy as dummy, and relabel your filesystem.