Package inferred system base pathname

Hi,

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.