The first answer that i can think is the patches needed on many packages to support selinux.
In the CentOS world, SELinux is a standard feature and there are a lot of command line tools that contain extra command options to access and modify SELinux contexts. For example, here is a snippet from the man pages for the added features found in the ls command: SELinux options: --lcontext Display security context. Enable -l. Lines will probably be too wide for most displays. -Z, --context Display security context so it fits on most displays. Displays only mode, user, group, security context and file name. --scontext Display only security context and file name. I don't know all the commands that have extra options, but I know find is one of them. Thanks Squall