gendl-asdf.asd does not declare dependency on gendl
The file gendl-asdf.lisp uses the function
gendl::peruse-file, and so requires that the gendl system already be loaded. When loading the gendl-asdf system in a lisp image that doesn't already have gendl loaded, an error is thrown since the gendl package doesn't exist.
:depends-on () to
:depends-on (:gendl) in the asd file allows a successful load.