Missing dependency libzstd-dev not available in Debian 9

debian/autobake-deb.sh

 in dir /home/buildbot/aarch64-debian-9-deb-autobake/build (timeout 1200 secs)

 watching logfiles {'CMakeCache.txt': './builddir/CMakeCache.txt'}

 argv: [b'debian/autobake-deb.sh']

 environment:

  BUILDMASTER=buildbot.mariadb.org

  BUILDMASTER_PORT=9992

  CCACHE_DIR=/mnt/ccache

  DEB_BUILD_OPTIONS=parallel=4

  HOME=/home/buildbot

  HOSTNAME=d43a6a8f6114

  PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

  PWD=/home/buildbot/aarch64-debian-9-deb-autobake/build

  WORKERNAME=aarch64-bbw2-docker-debian-9

 using PTY: False

Incrementing changelog and starting build scripts

libdistro-info-perl is not installed, Debian release names are not known.

libdistro-info-perl is not installed, Ubuntu release names are not known.

Creating package version 1:10.4.25+maria~stretch ... 

dpkg-buildpackage: info: source package mariadb-10.4

dpkg-buildpackage: info: source version 1:10.4.25+maria~stretch

dpkg-buildpackage: info: source distribution stretch

dpkg-buildpackage: info: source changed by Otto Kekäläinen <buildbot@d43a6a8f6114>

 dpkg-source -I --before-build build

dpkg-buildpackage: info: host architecture arm64

dpkg-checkbuilddeps: error: Unmet build dependencies: libzstd-dev

dpkg-buildpackage: warning: build dependencies/conflicts unsatisfied; aborting

dpkg-buildpackage: warning: (Use -d flag to override.)

program finished with exit code 3

elapsedTime=4.765945