Using non-AMD compatible javascript module with the shim config of require.js.

requirejs-backbone.js

requirejs.config({
  paths: {
    "underscore": "http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.4/underscore-min",
    "jquery": "http://cdnjs.cloudflare.com/ajax/libs/jquery/1.9.1/jquery.min",
    "backbone": "http://cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.10/backbone-min"
  },
  shim: {
    // Using non-AMD compatible javascript module with the shim config of require.js.
    "underscore": {
      exports: "_"
    },
    "backbone": {
      deps: ["underscore", "jquery"],
      exports: "Backbone"
    }
  }
});