#lang lazy

;; Building (ala Makefile) is serializing a tree of dependencies. How
;; can this be easily mapped to scheme? This is actually call by need
;; evaluation. Maybe an interesting opportunity to use the lazy scheme
;; language?


;; Library


(define (stamp thing)
  (cond
   ((or (string? thing)
        (path? thing))
    (file-or-directory-modify-seconds thing))))