make pycaffe error

When I make pycaffe in ubuntu16.04，it show error
`In file included from python/caffe/_caffe.cpp:20:0:
./include/caffe/sgd_solvers.hpp: In function 'void caffe::init_module__caffe()':
./include/caffe/sgd_solvers.hpp:28:9: error: 'Dtype caffe::SGDSolver::GetLearningRate() [with Dtype = float]' is protected
Dtype GetLearningRate();
^
python/caffe/_caffe.cpp:520:48: error: within this context
.add_property("lr", &SGDSolver::GetLearningRate);
^
Makefile:508: recipe for target 'python/caffe/_caffe.so' failed
make: *** [python/caffe/_caffe.so] Error 1
`
I find `Dtype GetLearningRate();` is public member in BVLC/caffe, so I change it to public, the error disappears, Has anyone else encountered this problem? or It only appeared in linux？