Clone the source repositories from GitHub:

# git clone https://github.com/ddccontrol/ddccontrol.git
# git clone https://github.com/ddccontrol/ddccontrol-db.git

You should now have two directories, ddccontrol and ddccontrol-db.

Monitor profiles are maintained in ddccontrol-db. Install the matching ddccontrol-db package to get the current monitor database. If your monitor is missing, follow the contribution instructions in that repository.

Alternatively, download the latest source tarballs from the releases page and unpack them with:

# tar xvfz ddccontrol-X.Y.tar.gz
# tar xvfz ddccontrol-db-YYYYMMDD.tar.gz