Build fails for opencv-contrib-python-4.7.0.68:
In file included from /usr/ports/graphics/py-opencv-contrib-python/work-py39/opencv-contrib-python-4.7.0.68/opencv/modules/dnn/misc/tensorflow/attr_value.pb.cc:4:
/usr/ports/graphics/py-opencv-contrib-python/work-py39/opencv-contrib-python-4.7.0.68/opencv/modules/dnn/misc/tensorflow/attr_value.pb.h:17:2: error: This file was generated by an older version of protoc which is
#error This file was generated by an older version of protoc which is
^
All headers generated by protobuf should be regenerated during build. They can't be reused.