增加引用

@@ -3,6 +3,7 @@ var gulp = require('gulp'),
     exec = require('child_process').exec,
     compass = require('gulp-compass'),
     uglify = require('gulp-uglify'),
+    concat = require('gulp-concat'),
     Package = require('father').SpmPackage,
     transport = require('gulp-spm'),
     server = require('gulp-develop-server');