old_contents: {
    "targets": [
      {
        "target_name": "GraphAnim",
        "sources": [
            "GraphAnim.cc",
            "Node_Graph.cc",
            "Node_Vertex.cc",
            "Node_Edge.cc"
        ]
      }
    ]
  }
  
new_contents: {
    "targets": [
      {
        "target_name": "GraphAnim",
        "sources": [
            "GraphAnim.cc",
            "Graph.cc",
            "Node_Graph.cc",
            "Node_Vertex.cc",
            "Node_Edge.cc"
        ]
      }
    ]
  }
  
subject: add to gyp build