In the past I have used modules with the pathname keyword in order to specify that a group of files come from a subdirectory.  However, I cannot find how to do this if I use the package inferred system approach. Basically what I would like to achieve is:

(asdf:defsystem :myproject
  :name ""
  :description ""
  :version "0.0.1"
  :pathname "src"    ;; non-existing keyword
  :class :package-inferred-system
  :defsystem-depends-on (:asdf-package-system)
  :depends-on (:myproject/all))

and all.lisp will be loaded from src/all.lisp.  Is that possible somehow?

Thanks in advance.

David.