/usr/bin/ml-build is in smlnj 110.79-2+b1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#!/bin/sh export SMLNJ_HOME=${SMLNJ_HOME:-/usr/lib/smlnj} exec $SMLNJ_HOME/bin/ml-build $@