diff --git a/mirror-img.asd b/mirror-img.asd
index d0cf441..a0f4b63 100644
--- a/mirror-img.asd
+++ b/mirror-img.asd
@@ -4,7 +4,7 @@
   :version "0.1"
   :license "GPLv3"
   :author "Jaidyn Ann <jadedctrl@posteo.at>"
-  :depends-on (:dexador :lquery :split-sequence)
+  :depends-on (:dexador :lquery :pathname-utils :split-sequence)
   :components ((:file "src/mirror-img"))
   :in-order-to ((test-op (test-op "mirror-img/tests"))
                 (build-op (build-op "mirror-img/unix"))))
diff --git a/src/mirror-img.lisp b/src/mirror-img.lisp
index f4d39ad..f31c3e3 100644
--- a/src/mirror-img.lisp
+++ b/src/mirror-img.lisp
@@ -108,7 +108,7 @@ to mirror it."
 DOWNLOAD-DIR, and URL-DIR."
   (format nil "~A~A"
           url-dir
-          (relative-pathname download-dir pathname)))
+          (pathname-utils:relative-pathname download-dir pathname)))
 
 
 
@@ -204,58 +204,3 @@ That is, 443 is implied by HTTPS, so nil is returned; but 998 wouldn’t be impl
   "Given a pathname, return the entirety of the file leaf.
 That is, everything following the last directory name."
   (car (last (split-sequence:split-sequence #\/ (namestring pathname)))))
-
-;; pathname pathname → pathname
-(defun relative-pathname (from pathname)
-  "Create a relative pathname leading from the pathname FROM to PATHNAME.
-By default, FROM is the current working directory."
-  (let* ((dir-str
-           (reduce (lambda (a b)
-                     (format nil "~A/~A" a b))
-                   (cdr (relative-pathname-directory pathname from))))
-         (dir-pathname
-           (pathname (format nil "~A/" dir-str))))
-    (merge-pathnames dir-pathname
-                     (pathname (pathname-leaf pathname)))))
-
-;; pathname pathname → list
-(defun relative-pathname-directory (pathname &optional (from (uiop/os:getcwd)))
-  "Given a PATHNAME, create a relative PATHNAME-DIRECTORY-style list from the
-perspective of the FROM pathname (the current working directory, by default).
-Returns something along the lines of '(:RELATIVE “..” “DAD”)"
-  (let* ((from      (cdr (pathname-directory from)))
-         (to        (cdr (pathname-directory pathname)))
-         (from+to   (list-lengths nil from to))
-         (to-append (list)))
-    (append
-     (list :relative)
-     (remove-if
-      #'not
-      (loop for from-dir in (car from+to)
-            for to-dir   in (cadr from+to)
-            collect
-            (cond ((equal from-dir to-dir)
-                   nil)
-                  ((not from-dir)
-                   to-dir)
-                  (to-dir
-                   (setq to-append (append to-append (list to-dir)))
-                   "..")
-                  ('T
-                   ".."))))
-     to-append)))
-
-;; object list … list → list(-of-lists)
-(defun list-lengths (padding &rest lists)
-  "Equalize the lengths of LISTS, by padding the tail-end of smaller lists with
-the PADDING object."
-  (let ((target-length
-          (apply #'max (mapcar #'length lists))))
-    (mapcar
-     (lambda (lst)
-       (append
-        lst
-        (loop for i
-              upto (- target-length (length lst) 1)
-              collect padding)))
-     lists)))