Here's my issue: 1. I have a bunch of lisp libraries that I use on everyday things installed in ~/common-lisp/. One of the systems in there is an older, modified version of fiveam that my company uses in many projects. 2. I have a project where we use libraries from quicklisp to make it easier to handle dependencies. For this project, I run a function that resets the ASDF source-registry, and uses a special copy of quicklisp (a copy that writes its systems in a different location). 3. I cannot build my system because the version of fiveam in ~/common-lisp/ shadows the version of fiveam from quicklisp, which I need. 4. I don't see any OBVIOUS way to tell ASDF to ignore my ~/common-lisp/ directory. I can do the following: (setf asdf:*default-source-registries* (remove 'asdf/source-registry::default-user-source-registry asdf:*default-source-registries*)) but that seems really hard-core. Would it be reasonable to make the defaults a little easier to override? Maybe something that's equivalent to --no-userinit and --no-sysinit when starting lisp -- something that will remove the user-specific entries or system-specific entries, respectively? I don't believe I can simply wipe the defaults, because then I might miss some SBCL libraries that come with the system default settings. Cheers, r