message: Attempt to fix build on mac mini.
diff: @@ -56,4 +56,5 @@ target_link_libraries(test_protobuf ${PROJECT_NAME} ${catkin_LIBRARIES})
  ##########
  cs_install()
  cs_export(INCLUDE_DIRS include ${CMAKE_CURRENT_BINARY_DIR}
  - CFG_EXTRAS voxblox-extras.cmake)
  + CFG_EXTRAS voxblox-extras.cmake
  + LIBRARIES ${PROTOBUF_LIBRARIES})
  