kdl_parser and catkin

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In catkin workspace I create package:

catkin_create_pkg leg_kinematics std_msgs rospy roscpp kdl_parser

In leg_kinematics/src/leg_kinematics.cpp:

#include "ros/ros.h"
#include <kdl_parser/kdl_parser.hpp>

int main(int argc, char **argv)
{
    KDL::Tree my_tree;
    ros::NodeHandle node;
    return 0;
}

In CMakeLists.txt:

cmake_minimum_required(VERSION 2.8.3)
project(leg_kinematics)

find_package(catkin REQUIRED COMPONENTS
  kdl_parser
  roscpp
  rospy
  std_msgs
)

catkin_package()

include_directories( include ${catkin_INCLUDE_DIRS})
add_executable(leg_kinematics src/leg_kinematics.cpp)
target_link_libraries(leg_kinematics ${catkin_LIBRARIES})

After catkin_make I got error:

CMakeFiles/leg_kinematics.dir/src/leg_kinematics.cpp.o: In function `main':
leg_kinematics.cpp:(.text+0x58): undefined reference to `KDL::Tree::Tree(std::string const&)'
CMakeFiles/leg_kinematics.dir/src/leg_kinematics.cpp.o: In function `KDL::TreeElement::~TreeElement()':
leg_kinematics.cpp:(.text._ZN3KDL11TreeElementD2Ev[_ZN3KDL11TreeElementD5Ev]+0x27): undefined reference to `KDL::Segment::~Segment()'
leg_kinematics.cpp:(.text._ZN3KDL11TreeElementD2Ev[_ZN3KDL11TreeElementD5Ev]+0x38): undefined reference to `KDL::Segment::~Segment()'

Why?)