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操作系统：Mac OS X
环境：xcode command line tools、io.js 2.2.1、npm 2.11.0

app.js

var express = require('express'),
    cons = require('consolidate'),
    mongodb = require('mongodb');

package.json

{
  "name":"intro_npm",
  "version":"0.0.0",
  "description": "npm introduction",
  "main": "app.js",
  "dependencies": {
    "consolidate": "~0.9.1",
    "express": "~3.2.6",
    "mongodb": "~1.3.10"
  },
  "author": "Shaun Verch",
  "license": "BSD"
}

bash 执行npm install的结果

npm WARN package.json intro_npm@0.0.0 No repository field.
npm WARN package.json intro_npm@0.0.0 No README data
npm WARN package.json intro_npm@0.0.0 license should be a valid SPDX license expression
 
> kerberos@0.0.3 install /Users/wangzishi/Test/intro_npm/node_modules/mongodb/node_modules/kerberos
> (node-gyp rebuild 2> builderror.log) || (exit 0)

  CXX(target) Release/obj.target/kerberos/lib/kerberos.o

> bson@0.2.5 install /Users/wangzishi/Test/intro_npm/node_modules/mongodb/node_modules/bson
> (node-gyp rebuild 2> builderror.log) || (exit 0)

  CXX(target) Release/obj.target/bson/ext/bson.o
consolidate@0.9.1 node_modules/consolidate

express@3.2.6 node_modules/express
├── methods@0.0.1
├── fresh@0.1.0
├── range-parser@0.0.4
├── cookie-signature@1.0.1
├── buffer-crc32@0.2.1
├── cookie@0.1.0
├── commander@0.6.1
├── mkdirp@0.3.4
├── debug@2.2.0 (ms@0.7.1)
├── send@0.1.0 (mime@1.2.6)
└── connect@2.7.11 (pause@0.0.1, bytes@0.2.0, qs@0.6.5, cookie@0.0.5, send@0.1.1, formidable@1.0.14)

mongodb@1.3.23 node_modules/mongodb
├── kerberos@0.0.3
└── bson@0.2.5

看起来安装应该没有问题
但是执行$ iojs app.js的时候控制台输出：

Failed to load c++ bson extension, using pure JS version

为啥bson组建加载失败呢？install的时候也没有warning或者error。
求指教