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 (-:)
install it via asdf install: Download ASDF package from http://boinkor.net/lisp/asdf-dependency-grovel/asdf-dependency-grovel-0.6.3.tar.gz
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