ASDF dependency grovel helps you maintain a Common Lisp system that is both easy to develop and speedy to recompile - think of it as a "make depend" for Lisp.
It allows you to keep your system definition in a serial (or condensed) shape, and figures out the dependencies between the system's components itself. This helps you or your users to incrementally compile the system when files change, without going insane from maintaining tens of compile/load-time dependencies for every file in the system.
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