problem when compile the code.

[job2003]

make all -j 16
error happens.

CXX/LD -o .build_release/tools/extract_features.bin
CXX/LD -o .build_release/tools/test_net.bin
CXX/LD -o .build_release/tools/net_speed_benchmark.bin
CXX/LD -o .build_release/tools/convert_imageset.bin
CXX/LD -o .build_release/tools/device_query.bin
CXX/LD -o .build_release/tools/compute_image_mean.bin
.build_release/tools/caffe.o: In function time()': caffe.cpp:(.text+0x5cfd): undefined reference to void caffe::caffe_gpu_dot(int, float const*, float const*, float*)'
collect2: error: ld returned 1 exit status
Makefile:626: recipe for target '.build_release/tools/caffe.bin' failed
make: *** [.build_release/tools/caffe.bin] Error 1
make: *** Waiting for unfinished jobs....

what is the problem?