I think the generated '...-sbcl-hdf5-cffi-1.8.18/lib/sbcl/hdf5-cffi.asd' file is missing a dependency. It contains ':depends-on ("cffi")', but I think it should be ':depends-on ("cffi" "cffi-grovel")', because the original asd file has:
--8<---------------cut here---------------start------------->8--- :defsystem-depends-on (:cffi-grovel) :depends-on (:cffi) --8<---------------cut here---------------end--------------->8--- Maybe the 'defsystem-depends-on' part is currently ignored by asdf-build-system... This would explain why cffi-grovel is not loaded automatically when loading hdf5-cffi.
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