Hi, The 'asd-systems' field contains the minimal subset of the ASDF systems defined by a library that, when compiled, compiles all the systems of the library. For example, the ironclad package has many subsystems: "ironclad/ciphers" "ironclad/digests" "ironclad/cipher/aes" "ironclad/cipher/threefish" "ironclad/digest/sha256" "ironclad/public-key/ed25519" ... but the 'asd-systems' field only contains "ironclad". The mcclim package also has many subsystems: "automaton" "clim" "clim-core" "clim-core/frames" "clim-core/system" "drei-mcclim" "esa-mcclim" "mcclim-backend-common" "mcclim-fonts" "slim" ... but the 'asd-systems' field only contains the top level ones, "mcclim", "clim-examples" and "clim-debugger". So you can't rely on the contents of 'asd-systems' to have a complete list of the systems defined by a library. You could get the full list by searching the for 'defsystem' forms in the sources directly, with something like: --8<---------------cut here---------------start------------->8--- find sources -name "*.asd" -exec grep "(defsystem" {} \; | cut -d ' ' -f 2 --8<---------------cut here---------------end--------------->8--- But it would only work for systems not using the package-inferred-system feature of ASDF. In my files, I found a function (I don't remember where I got it from) that can get all the dependencies of a loaded system, even the ones using package-inferred-system. Maybe it could be modified to limit the results to a specific library's source tree...