Linux
From PacBSD Wiki
Linux binary compatibility
To enable Linux binary compatibility enable the linux repository in /etc/pacman.conf
#[linux] #SigLevel = PackageRequired #Include = /etc/pacman.d/mirrorlist
loading the Linux module
You'll need to load the linux module or add it to /etc/conf.d/modules to autoload the module on boot
Installing Linux base
To install the linux base use:
pacman -S linux