+ set +e
+ /usr/bin/which dpkg-scanpackages >/dev/null
+ if [[ "$?" != "0" ]]; then
+ echo >&2
+ echo >&2 "Error: please install dpkg-dev. E.g. sudo apt-get install dpkg-dev"
+ echo >&2
+ exit 1
+ fi
+ /usr/bin/which apt-ftparchive >/dev/null
+ if [[ "$?" != "0" ]]; then
+ echo >&2
+ echo >&2 "Error: please install apt-utils. E.g. sudo apt-get install apt-utils"
+ echo >&2
+ exit 1
+ fi
+ set -e