The demo of compilation with library in a different ways.

demo/hello-epi.js

@@ -1,8 +1,14 @@
 /* This is a code which is going to be compiled together with the library */
 
+goog.require('ol.Map');
+goog.require('ol.layer.OSM');
+goog.require('ol.Loc');
+
+goog.require('goog.dom');
+
 function init() {
-    var map = new ol.Map()
-        // .render('map')
+    var map = new ol.Map();
+    map.setContainer(goog.dom.getElement('map'));
     map.setLayers( [ new ol.layer.OSM() ] );
     map.setCenter( new ol.Loc(45, 5));
     map.setZoom(10);