sems core is a part of project Yeti
# apt install curl gnupg
# echo "deb [arch=amd64] http://apt.postgresql.org/pub/repos/apt bullseye-pgdg main" > /etc/apt/sources.list.d/pgdg.list
# curl https://www.postgresql.org/media/keys/ACCC4CF8.asc | gpg --dearmor > /etc/apt/trusted.gpg.d/apt.postgresql.org.gpg
# echo "deb [arch=amd64] http://pkg.yeti-switch.org/debian/bullseye 1.12 main" > /etc/apt/sources.list.d/yeti.list
# curl https://pkg.yeti-switch.org/key.gpg | gpg --dearmor > /etc/apt/trusted.gpg.d/pkg.yeti-switch.org.gpg
# apt install sems sems-modules-base
check Documentation for additional versions/distributions info
# apt install git cmake build-essential devscripts
$ git clone https://github.com/yeti-switch/sems.git --recursive
$ cd sems
# apt build-deps .
$ debuild -us -uc -b