gistfile1.clj

(defmacro with-ns [ns & body]
  `(binding [*ns* (the-ns ~ns)]
     ~@(map (fn [form] `(eval '~form)) body)))

(with-ns 'clojure.core
  (def in-ns* in-ns)
  (defn in-ns [name]
    (doseq [dep (-> name meta :deps)]
      (capra.package/install dep))
    (in-ns* name)))