The MxNet.cpp project has been merged with official mxnet project: https://github.com/dmlc/mxnet/tree/master/cpp-package. Service of this repo is discontinued. All further development will be made in mxnet repo.
If you want to use MxNet.cpp, please checkout the mxnet project. If you have any issues or suggestions, please raise an issue in the mxnet project. Thanks for your support!