Create the chroot:

    # sbuild-createchroot --arch=i386 \
    > --make-sbuild-tarball=/srv/chroots/sid-i386-cross-buildd.tgz sid \
    > /srv/chroots/sid-i386 \
    > http://odin1.pehjota.net:3142/ftp.us.debian.org/debian

Add your normal user to the `sbuild` group:

    # sbuild-adduser <youruser>

Edit your new chroot's schroot configuration to allow users in groups `root` and
`sbuild` to access the schroot service:

    # echo 'source-root-groups=root,sbuild' >> \
    > /etc/schroot/chroot.d/sid-i386-sbuild-*

Start a new login shell with your normal user to load your new group membership:

    # login

Update the chroot:

    $ sbuild-update -u sid-i386
    $ sbuild-update -g sid-i386

Enter the chroot as the superuser:

    $ fakeroot sbuild-shell sid-i386

Edit the APT sources list:

    # cat > /etc/apt/sources.list <<EOF
    > deb [arch=i386] http://odin1.pehjota.net:3142/ftp.us.debian.org/debian sid main
    > deb [arch=armel] http://odin1.pehjota.net:3142/ftp.us.debian.org/debian sid main
    > deb [arch=armhf] http://odin1.pehjota.net:3142/ftp.us.debian.org/debian sid main
    > deb-src http://odin1.pehjota.net:3142/ftp.us.debian.org/debian sid main
    > deb [arch=i386] http://odin1.pehjota.net:3142/emdebian.org/~thibg/repo sid main cross-deps
    > deb [arch=armel] http://odin1.pehjota.net:3142/emdebian.org/~thibg/repo sid main cross-deps
    > deb [arch=armhf] http://odin1.pehjota.net:3142/emdebian.org/~thibg/repo sid main cross-deps
    > deb-src http://odin1.pehjota.net:3142/emdebian.org/~thibg/repo sid main cross-deps
    > EOF

Exit the chroot:

    # exit

Update the package lists in the chroot:

    $ sbuild-update -u sid-i386

Download and build some source packages:

    $ dget -d http://cdn.debian.net/debian/pool/main/b/base-files/base-files_6.11.dsc
    $ sbuild --build=i386 --host=armhf -d sid base-files_6.11.dsc
    $ dget -d http://cdn.debian.net/debian/pool/main/d/dash/dash_0.5.7-3.dsc
    $ sbuild --build=i386 --host=armhf -d sid dash_0.5.7-3.dsc