Path config fallback for RequireJS compilation error

Error stack trace

Error: Error: ENOENT, no such file or directory 'RAILS_ROOT/tmp/assets/http:/cdnjs.cloudflare.com/ajax/libs/zepto/1.0rc1/zepto.min,zepto.js'
    at Object.fs.openSync (fs.js:338:18)

    at build (/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/requirejs-rails-0.9.0/bin/r.js:14166:23)
    at requirejs.optimize.runBuild (/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/requirejs-rails-0.9.0/bin/r.js:15358:30)
    at Object.context.execCb (/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/requirejs-rails-0.9.0/bin/r.js:1773:33)
    at Object.Module.check (/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/requirejs-rails-0.9.0/bin/r.js:1083:51)
    at Object.Module.enable (/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/requirejs-rails-0.9.0/bin/r.js:1324:22)
    at Object.Module.init (/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/requirejs-rails-0.9.0/bin/r.js:982:26)
    at Object.context.require (/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/requirejs-rails-0.9.0/bin/r.js:1579:28)
    at requirejs (/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/requirejs-rails-0.9.0/bin/r.js:1857:24)
    at Function.requirejs.optimize (/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/requirejs-rails-0.9.0/bin/r.js:15368:13)
    at RAILS_ROOT/tmp/rjs_driver.js:48:15
rake aborted!
Asset compilation with node failed.

rjs_driver.js

//Load the requirejs optimizer
var requirejs = require('/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/requirejs-rails-0.9.0/bin/r.js'),
  //Set up basic config, include config that is
  //common to all the optimize() calls.
  basConfig = {
  "baseUrl": "RAILS_ROOT/tmp/assets",
  "paths": {
    "zepto": "http://cdnjs.cloudflare.com/ajax/libs/zepto/1.0rc1/zepto.min",
    "jquery": "http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min"
  }
};

// Function used to mix in baseConfig to a new config target
function mix(target) {
  for (var prop in basConfig) {
    if (basConfig.hasOwnProperty(prop)) {
      target[prop] = basConfig[prop];
    }
  }
  return target;
}

var module_specs = [
{
  "name": "almond",
  "exclude": [
    "zepto",
    "jquery"
  ],
  "include": "application",
  "out": "RAILS_ROOT/public/assets/application.js"
},
];

// Do a series of builds of individual files, using the args suggested by:
// http://requirejs.org/docs/optimization.html#onejs
//
// r.js will eventually need a nested call idiom to handle async 
// builds.  Anticipating that need.
var async_runner = module_specs.reduceRight(function(prev, curr) {
  return function (buildReportText) { 
    requirejs.optimize(mix(curr), prev);
  };
}, function(buildReportText) {} );

async_runner();