Level 2 - Server Level 2 - Workstation
SELinux provides Mandatory Access Controls.
Without a Mandatory Access Control system installed only the default Discretionary Access Control system will be available.
Run the following command and verify libselinux is installed:
# rpm -q libselinux libselinux-<version>
Run the following command to install libselinux:
# yum install libselinux
SELinux and AppArmor both have several package names in use on different distributions. Research the appropriate packages for your environment.