update file voxel_layer

CMakeLists.txt

@@ -150,6 +150,9 @@ endif()
 if (NOT TARGET laser_geometry)
     add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../laser_geometry ${CMAKE_BINARY_DIR}/laser_geometry_build)
 endif()
+if (NOT TARGET voxel_grid)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../voxel_grid ${CMAKE_BINARY_DIR}/voxel_grid_build)
+endif()
 
 include_directories(
     include  
@@ -183,6 +186,7 @@ target_link_libraries(costmap_2d_new
     nav_msgs
     map_msgs
     laser_geometry
+    voxel_grid
     ${TF2_LIBRARY}
 )
 target_include_directories(costmap_2d_new PRIVATE ${Boost_INCLUDE_DIRS})