The asdf-dependency-grovel uses an extended *macroexpand-hook* to find out dependency information. This seems to work better than implementation-provided xref facilities (at least as long as there are no "uses at compile time" queries in xrefs (-:)
For the latest version, you can find a public git repository is at: http://git.boinkor.net/git/asdf-dependency-grovel.git/
install it via asdf install: Download ASDF package from http://boinkor.net/lisp/asdf-dependency-grovel/asdf-dependency-grovel-1.0.0.tgz
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