编译caffe的时候出现No such file or directory #include google/protobuf/port_def.inc的错误，
但是通过查找，发现 port_def.inc文件是存在的，路径是：/usr/local/miniconda3/envs/dl/include/google/protobuf/,
所以解决方法是，把/usr/local/miniconda3/envs/dl/include添加到头文件路径：
INCLUDE_DIRS := $(PYTHON_INCLUDE) /usr/local/include /usr/include/hdf5/serial/ /usr/local/miniconda3/envs/dl/include