;; What follows is a "manifest" equivalent to the command line you gave.
;; You can store it in a file that you may then pass to any 'guix' command
;; that accepts a '--manifest' (or '-m') option.

(specifications->manifest
  (list "sbcl" "sbcl-lla" "sbcl-plump" "sbcl-dexador" "sbcl-lquery" "sbcl-array-operations" "sbcl-alexandria"))