Bind *compile-path*, not sure how it becomes unbound.

src/leiningen/compile.clj

@@ -7,7 +7,10 @@
   "Compile the namespaces specified in build.clj or all namespaces in src/
   if none are provided."
   [project]
+  ;; TODO: not sure why this is necessary
+  (binding [*compile-path* "classes/"]
     (.mkdir (file (:root project) "classes"))
     (doseq [n (or (:namespaces project)
                   (find-namespaces-in-dir (file (:root project) "src")))]
-    (compile n)))
+      (println "Compiling" n)
+      (clojure.core/compile n))))