Hi, >Say a package installs only headers, and in one of those, a header of another -dev package is #included. How to depend on the package? I would call it libfoo-dev (arch:all) and depend (runtime) on libbar-dev. Feel free to steal from websocketpp, a source-only library I maintain. https://sources.debian.net/src/websocketpp/0.7.0-5/debian/control/ Hope this helps, G.