# lb clean --purge
P: Executing auto/clean script.
P: Executing auto/clean script.
P: Cleaning chroot
P: Executing auto/clean script.
# lb build
P: Automatically populating config tree.
P: Executing auto/config script.
P: Considering defaults defined in /etc/live/build.conf
P: Updating config tree
P: Executing auto/build script.
P: Setting up cleanup function
W: skipping /usr/share/live/build/scripts/build/lb_bootstrap_cache, foreign architecture.
W: skipping /usr/share/live/build/scripts/build/lb_bootstrap_debootstrap, foreign architecture.
W: skipping /usr/share/live/build/scripts/build/lb_bootstrap_cache, foreign architecture.
P: Begin unmounting filesystems...
P: Setting up cleanup function
P: Begin caching chroot stage...
P: Begin mounting /dev/pts...
P: Begin mounting /proc...
P: Begin mounting /sys...
P: Configuring file /etc/debian_chroot
/usr/share/live/build/scripts/build/lb_chroot_debianchroot: 81: cannot create chroot/etc/debian_chroot: Directory nonexistent
P: Begin unmounting filesystems...

# cat binary.log 
P: Setting up cleanup function
W: skipping /usr/share/live/build/scripts/build/lb_bootstrap_cache, foreign architecture.
W: skipping /usr/share/live/build/scripts/build/lb_bootstrap_debootstrap, foreign architecture.
W: skipping /usr/share/live/build/scripts/build/lb_bootstrap_cache, foreign architecture.
P: Begin unmounting filesystems...
P: Setting up cleanup function
P: Begin caching chroot stage...
P: Begin mounting /dev/pts...
P: Begin mounting /proc...
P: Begin mounting /sys...
P: Configuring file /etc/debian_chroot
/usr/share/live/build/scripts/build/lb_chroot_debianchroot: 81: cannot create chroot/etc/debian_chroot: Directory nonexistent
P: Begin unmounting filesystems...


# cat auto/config 
#!/bin/sh

lb config noauto \
        --architecture sparc \
        --packages-lists "standard" \
        "${@}"

INFO
host: amd64
debootstrap: 1.0.26+squeeze1