Module opencv_dnn_objdetect disabled because opencv_dnn dependency can't be resolved!

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Hi all,

I want to compiled the DNN module in openCV3.4.3, but build log remind me:
Module opencv_dnn_objdetect disabled because opencv_dnn dependency can’t be resolved!

This is the config for DNN in opencv_3.4.3.bb:
PACKAGECONFIG[dnn] = “-DBUILD_opencv_dnn=ON -DPROTOBUF_UPDATE_FILES=ON -DBUILD_PROTOBUF=OFF,-DBUILD_opencv_dnn=OFF,protobuf protobuf-native,”

DNN append in opencv_3.4.3.bbappend:
PACKAGECONFIG_append = “dnn”

What does “protobuf protobuf-native” mean?
Please tell me how to provide dependencies for opencv_dnn.

Thanks in advance.