Error when building E2X with make

[dmitrii-badretdinov]

When building a merged version of Caffe and E2X, I get the following error:

detection_evaluate_layer.cpp: In member function ‘virtual void caffe::DetectionEvaluateLayer<Dtype>::
Forward_cpu(const std::vector<caffe::Blob<Dtype>*>&, const std::vector<caffe::Blob<Dtype>*>&)’:
detection_evaluate_layer.cpp:170:58: error: 
‘const value_type’ {aka ‘const class caffe::NormalizedBBox’} has no member named ‘idx’
  170 |           top_data[num_det * EVAL_SHAPE + 9] = bboxes[i].idx();
      |                                                          ^~~

The code and steps that to reproduce the issue are located here.