Recommends
----------

 arch-test            Building chroots for arches that cannot be executed on
                      the current platform.

 fakechroot, fakeroot For --mode=fakechroot.

 gpg                  To figure out the right signed-by value for distributions
                      that apt doesn't know the right keyring for.

 libdistro-info-perl  To figure out whether a distro is EOL or not and to
                      figure out which security mirror to use because Debian
                      bullseye and later use suite-security instead of
                      suite/updates.

 libdpkg-perl         To find out keyring paths.

 mount                Needed in cases mknod is not permitted and device nodes
                      have to be bind-mounted instead. It is also needed in
                      root and unshare mode to mount /sys and /proc but is not
                      needed in fakechroot mode.

 uidmap               For --mode=unshare.

Suggests
--------

 apt-transport-tor    If using apt sources.list with tor+ (Tor network).

 apt-utils            To have /usr/lib/apt/solvers/apt for the
                      /usr/lib/apt/solvers/mmdebstrap-dump-solution executable.

 binfmt-support       Chroots for architectures that cannot be executed by the
                      host CPU unless in chrootless mode.

 ca-certificates      If using apt sources.list with https.

 debootstrap          For using /usr/share/debootstrap/scripts/ to infer distro
                      names from the symlinks and
                      /usr/share/debootstrap/scripts/gutsy to figure out the
                      default mirror URL.

 distro-info-data     To get better data about new distros or EOL distros.

 dpkg-dev             For the dpkg-architecture binary to turn a Debian
                      architecture into the DEB_HOST_MULTIARCH value.

 genext2fs            For --format=ext2.

 perl-doc             Generation of man page from source code with --help.

 qemu-user-static     For cross platform builds such as building arm64 on
                      amd64.

 squashfs-tools-ng    For --format=squashfs.