Bootstrap a base Arch Linux system from any GNU distro.

# install -m 755 arch-bootstrap.sh /usr/local/bin/arch-bootstrap

Create a base arch distribution in directory 'myarch' (i686 arch by default):

# arch-bootstrap myarch

The same but use arch x86_64 and a given repository source:

# arch-bootstrap -a x86_64 -r "ftp://ftp.archlinux.org" myarch 

Once the process has finished, chroot to the destination directory (default user: root/root):

# chroot destination

Note that some packages require some system directories to be mounted. Some of the commands you can try:

# mount --bind /proc myarch/proc
# mount --bind /sys myarch/sys
# mount --bind /dev myarch/dev
# mount --bind /dev/pts myarch/dev/pts