```common lisp
(cl:in-package #:asdf-user)

(defsystem clump
  :depends-on (:clump-binary-tree :clump-splay-tree))
```

Remove system :CLUMP-SPLAY-TREE from :DEPENDS-ON list.
user
```common lisp
(cl:in-package #:asdf-user)

(defsystem clump
  :depends-on (:clump-binary-tree))
```
assistant