SCM systems and pathnames question

Hi

Apologies if this is a very stupod question.

Is there a way to get the actual pathname a SCM-SCM-SYSTEM was defined in?
I mean something like.

You have the file *foo.lwsys* where the system is defined.

----
;;; Here is the system.

(defsystem "foo" () :members ("q" "w" "e" "r"))
----

Then

cl-prompt>
*(scm:get-me-the-pathname-the-sys-was-defined-in (scm:find-system "Foo"))*
#P"/some/folder/with/foo.lwsys"

Thanks

-- 
Marco Antoniotti