JSHint Backbone not defined in CodeKit

A small test app is set up like this:

init.js:

//@codekit-prepend "vendor/jquery-1.7.2.js"
//@codekit-prepend "vendor/underscore.js"
//@codekit-prepend "vendor/backbone.js"

// Setup namespace for the app
window.app = window.app || {};

//@codekit-append "models/Ride.js"

Ride.js:

(function() {
    window.app.Ride = Backbone.Model.extend({

        initialize: function() {
            console.log("Ride initialized");
        }
    });
})();

CodeKit's JSHint check reports that both Backbone and console are not defined. What am I missing here?