fatal error: cublas_v2.h: No such file or directory

I install caffe in my ubuntu16.04 and I run the make runtest ,make python ,all is ok.
But when I run the faster-rcnn following the steps in https://github.com/rbgirshick/py-faster-rcnn ,errors occurs, When I run the make -j8 && make pycaffe , I get the error message :/include/caffe/util/device_alternate.hpp:34:23: fatal error: cublas_v2.h: No such file or directory.But when I install caffe ,they works well.I confused with it .
Thanks for who can tell me the reason