old_contents: {
    "targets": [
      {
        "target_name": "speedup",
        "sources": ["src/speedup.cc"],
        "include_dirs" : [
            "node_modules/nan"
        ],
      }
    ]
  }
  
new_contents: {
    "targets": [
      {
        "target_name": "speedup",
        "sources": ["src/speedup.cc"],
        "include_dirs": ["<!(node -e \"require('nan')\")"],
      }
    ]
  }
  
subject: Update binding.gyp