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Thank you for your input. I finally found the problem, which was not related to the package itself but to the way I created it :'((. I used the following command :

catkin create pkg non_lethal_obstacle_layer dynamic_reconfigure geometry_msgs laser_geometry message_filters pluginlib roscpp sensor_msgs tf2 tf2_geometry_msgs tf2_ros tf2_sensor_msgs voxel_grid

instead of :

catkin_create_pkg non_lethal_obstacle_layer dynamic_reconfigure geometry_msgs laser_geometry message_filters pluginlib roscpp sensor_msgs tf2 tf2_geometry_msgs tf2_ros tf2_sensor_msgs voxel_grid

This created an empty copy of many standard packages. I still does not understand why it even compiled. (just an error with the dynamic reconfigure option in CMakeList, that I commented out to skip forward...) Anyway, the removal of spurious packages, cleanup and rebuild corrected the problem.

I apologize for the trouble.

Cheers, Laurent