error: #error FLANN is not available. Please use a different NearestNeighbors data structure.

[METEORITENMAX]

the vox_nav_planning package fails..

~/vox_nav_ws$ colcon build --symlink-install --cmake-args -DCMAKE_BUILD_TYPE=Release -DACADOS_WITH_QPOASES=ON -DACADO_CODE_IS_READY=ON -DWITH_IPOPT=true --packages-skip-regex archive --packages-skip vox_nav_control vox_nav_misc; source /opt/ros/humble/setup.bash
Starting >>> ompl    
Starting >>> vox_nav_msgs
Starting >>> ACADO
Starting >>> casadi
Finished <<< casadi [0.55s]                                                                                             
Finished <<< ompl [0.92s]                                                                                            
Finished <<< ACADO [1.29s]                                                                
Finished <<< vox_nav_msgs [1.34s]                   
Starting >>> vox_nav_utilities
Finished <<< vox_nav_utilities [0.36s]                      
Starting >>> vox_nav_planning
Starting >>> vox_nav_map_server
Starting >>> vox_nav_navigators
Starting >>> vox_nav_waypoint_nav_clients
Finished <<< vox_nav_map_server [0.22s]                                                                       
Finished <<< vox_nav_waypoint_nav_clients [0.21s]
Finished <<< vox_nav_navigators [0.28s]
--- stderr: vox_nav_planning                               
In file included from /home/max/vox_nav_ws/src/vox_nav/vox_nav_planning/include/vox_nav_planning/native_planners/CostTrustKinoPlanner.hpp:36,
                 from /home/max/vox_nav_ws/src/vox_nav/vox_nav_planning/src/native_planners/CostTrustKinoPlanner.cpp:15:
/home/max/vox_nav_ws/install/ompl/include/ompl-1.6/ompl/datastructures/NearestNeighborsFLANN.h:42:2: error: #error FLANN is not available. Please use a different NearestNeighbors data structure.
   42 | #error FLANN is not available. Please use a different NearestNeighbors data structure.
      |  ^~~~~
In file included from /home/max/vox_nav_ws/install/vox_nav_utilities/include/vox_nav_utilities/elevation_state_space.hpp:22,
                 from /home/max/vox_nav_ws/src/vox_nav/vox_nav_planning/include/vox_nav_planning/native_planners/CostTrustKinoPlanner.hpp:44,
                 from /home/max/vox_nav_ws/src/vox_nav/vox_nav_planning/src/native_planners/CostTrustKinoPlanner.cpp:15:
/opt/ros/humble/include/tf2_geometry_msgs/tf2_geometry_msgs/tf2_geometry_msgs.h:35:2: warning: #warning This header is obsolete, please include tf2_geometry_msgs/tf2_geometry_msgs.hpp instead [-Wcpp]
   35 | #warning This header is obsolete, please include tf2_geometry_msgs/tf2_geometry_msgs.hpp instead
      |  ^~~~~~~
gmake[2]: *** [CMakeFiles/vox_nav_ompl_planners.dir/build.make:132: CMakeFiles/vox_nav_ompl_planners.dir/src/native_planners/CostTrustKinoPlanner.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:157: CMakeFiles/vox_nav_ompl_planners.dir/all] Error 2
gmake: *** [Makefile:146: all] Error 2
---
Failed   <<< vox_nav_planning [9.79s, exited with code 2]

Summary: 8 packages finished [11.7s]
  1 package failed: vox_nav_planning
  1 package had stderr output: vox_nav_planning
  1 package not processed

why is FLANN not available? i m using ubuntu 22.04, ROS2 humble and i tried sudo apt install libflann1.9 ..