(builder
  ;; Compress JS and CSS files
  (:deflater :content-type '("application/javascript" "text/css"))
  (:static
   :path (lambda (path)
           (if (ppcre:scan "^(?:/assets/|robot\\.txt$|/favicon\\.ico$)" path)
               path
               nil))
   :root (asdf:system-relative-pathname :mysystem #P"public/"))
  app)