Two versions of liboctomap installed by ros-melodic-moveit

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After installing moveit on 18.04

sudo apt install ros-melodic-moveit

I have the following

/opt/ros/melodic/lib/liboctomap.so.1.9
/usr/lib/liboctomap.so.1.8

Is this intended or is this a bug? Does anyone know an efficient way to know which version does moveit_core links against?

I depend on also on dart, which links with 1.8.

Edit: More precisions after gvdhoorm's comment:

I devellop libsigned_distance_field.so, which relies on a library using dart, which links to octomap 1.8 and I currently get :

ldd devel/lib/libsigned_distance_field.so | grep octomap
liboctomap.so.1.9 => /opt/ros/melodic/lib/liboctomap.so.1.9 (0x00007f5e43f9c000)
liboctomap.so.1.8 => /usr/lib/liboctomap.so.1.8 (0x00007f5e341bb000)

And I can not figure out how the linker picked up liboctomap.so.1.9 since all the dependencies that I can see use only 1.8.

Is there a way to know how the libraries are chosen at linking time?

In the CMakeLists.txt I have

add_library(${PROJECT_NAME} SHARED ${LIB_SOURCES} ${INC_SIGNED_DISTANCE_FIELD})
target_link_libraries(${PROJECT_NAME} ${catkin_LIBRARIES})

When I print catkin_LIBRARIES : No mention of liboctomap at all At link time with VERBOSE=1 it suddenly appears and it points to 1.9.

Does anyone know how I can prevent 1.9 from being passed to the linker?