Command not found when In chroot

Im currently Porting Arch Linux to My phone and I am trying to set up the rootfs properly - have it installed to an external scdard and am using busybox to chroot into it with busybox chroot /data/ local/mnt sh I can see pacman exists when I search for it: /usr/bin # type -a pacman returns /sbin/pacman but whenever I try to install the base system with: pacman -S base-devel 1lightdm xorg-xinit xfce4 networkmanager --needed I get sh: pacman: not found