boulder is the Serpent OS build tool, and used to build packages. Make sure you have the latest version installed.
Unless you are using Serpent OS directly, you will need to manually install the tooling
Installation via onboarding
For instructions, please visit: https://github.com/serpent-os/onboarding.
ldc2 is installed and available in the
curl https://raw.githubusercontent.com/serpent-os/onboarding/main/init.sh |bash