provides package which links to all files under the named directory

asd.lisp

;;; inside your ASD file
(in-package :cl-user)
(defpackage foo-asd
  (:use :cl :asdf)
  (:export :define-dependency-aggregator-package))
(in-package :foo-asd)

(ql:quickload :alexandria)
(defparameter *dependency-source-dir* (merge-pathnames #P"src/" (uiop:getcwd)))
(defun define-dependency-aggregator-package (name)
  (let ((file-names-without-ext
          (mapcar #'pathname-name
                  (uiop:directory-files
                   (merge-pathnames (pathname (format nil "~A/" (string-downcase (subseq (symbol-name name) (1+ (position #\/ (symbol-name name) :from-end t)))))) *dependency-source-dir*)))))
    `(defpackage ,name
       (:use :cl)
       ,@(mapcar #'(lambda (f) (list :import-from (alexandria:make-keyword (string-upcase (format nil "~A/~A" name f))))) file-names-without-ext))))

features.lisp

(in-package :cl-user)

#.(foo-asd:define-dependency-aggregator-package :foo/features)