Aliengo catkin_make Error

[Peter19990725]

/usr/bin/ld: cannot find -lunitree_legged_sdk_
collect2: error: ld returned 1 exit status
[ 91%] Linking CXX executable /home/unitree/catkin2_ws/devel/lib/unitree_legged_real/velocity_lcm
unitree_ros_to_real/unitree_legged_real/CMakeFiles/lcm_server_3_2.dir/build.make:112: recipe for target '/home/unitree/catkin2_ws/devel/lib/unitree_legged_real/lcm_server_3_2' failed
make[2]: *** [/home/unitree/catkin2_ws/devel/lib/unitree_legged_real/lcm_server_3_2] Error 1
CMakeFiles/Makefile2:2232: recipe for target 'unitree_ros_to_real/unitree_legged_real/CMakeFiles/lcm_server_3_2.dir/all' failed
make[1]: *** [unitree_ros_to_real/unitree_legged_real/CMakeFiles/lcm_server_3_2.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
/usr/bin/ld: cannot find -lunitree_legged_sdk_
collect2: error: ld returned 1 exit status
unitree_ros_to_real/unitree_legged_real/CMakeFiles/torque_lcm.dir/build.make:112: recipe for target '/home/unitree/catkin2_ws/devel/lib/unitree_legged_real/torque_lcm' failed
make[2]: *** [/home/unitree/catkin2_ws/devel/lib/unitree_legged_real/torque_lcm] Error 1
CMakeFiles/Makefile2:1940: recipe for target 'unitree_ros_to_real/unitree_legged_real/CMakeFiles/torque_lcm.dir/all' failed
make[1]: *** [unitree_ros_to_real/unitree_legged_real/CMakeFiles/torque_lcm.dir/all] Error 2