Create BaxterRobot.h and BaxterRobot.cpp but compile error

[zjnkinetic]

I want to create BaxterRobot.h BaxterRobot.cpp for my project.At the begining, I put them in a folder /usr/include/dqrobotics/robots/ and /usr/src/dqrobotics/robots.But I could not find the CmakeLists.txt for dqrobotics,So this can't work.So in the second try,I put them in my personal workspace folder /baxter/src/baxter_noetic/baxter_test/include and /baxter/src/baxter_noetic/baxter_test/src,but I encountered some errors while compiling.Below is the error and source code.Can anyone make some suggestions, thank you very much.

/usr/bin/ld: CMakeFiles/BaxterRobot.dir/src/BaxterRobot.cpp.o: in function BaxterRobot::kinematics()': BaxterRobot.cpp:(.text+0x53d): undefined reference to DQ_robotics::DQ_SerialManipulatorDH::DQ_SerialManipulatorDH(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&)'
/usr/bin/ld: CMakeFiles/BaxterRobot.dir/src/BaxterRobot.cpp.o: in function __static_initialization_and_destruction_0(int, int)': BaxterRobot.cpp:(.text+0x6ae): undefined reference to DQ_robotics::DQ::DQ(double const&, double const&, double const&, double const&, double const&, double const&, double const&, double const&)'
/usr/bin/ld: BaxterRobot.cpp:(.text+0x73a): undefined reference to DQ_robotics::DQ::DQ(double const&, double const&, double const&, double const&, double const&, double const&, double const&, double const&)' /usr/bin/ld: BaxterRobot.cpp:(.text+0x7c6): undefined reference to DQ_robotics::DQ::DQ(double const&, double const&, double const&, double const&, double const&, double const&, double const&, double const&)'
/usr/bin/ld: BaxterRobot.cpp:(.text+0x852): undefined reference to `DQ_robotics::DQ::DQ(double const&, double const&, double const&, double const&, double const&, double const&, double const&, double const&)'
collect2: error: ld returned 1 exit status
make[2]: *** [baxter_noetic/baxter_test/CMakeFiles/BaxterRobot.dir/build.make:183：/home/ris/baxter_ws/devel/lib/baxter_test/BaxterRobot] 错误 1
make[1]: *** [CMakeFiles/Makefile2:6741：baxter_noetic/baxter_test/CMakeFiles/BaxterRobot.dir/all] 错误 2
make: *** [Makefile:141：all] 错误 2

#ifndef DQ_ROBOTS_BAXTERROBOT_H
#define DQ_ROBOTS_BAXTERROBOT_H

#include <dqrobotics/robot_modeling/DQ_SerialManipulatorDH.h>

using namespace DQ_robotics;

class BaxterRobot
{
public:
static DQ_SerialManipulatorDH kinematics();
};

#endif

#ifndef DQ_ROBOTICS_BAXTER_DH_H
#define DQ_ROBOTICS_BAXTER_DH_H

#include <baxter_test/BaxterRobot.h>
#include <dqrobotics/utils/DQ_Constants.h>

DQ_SerialManipulatorDH BaxterRobot::kinematics()
{
const double pi2 = pi/2.0;
const double endeffector_z = 0.229525;

Matrix<double,5,7> baxter_dh(5,7);
baxter_dh <<  0,          0,          0,         0,        0,         0,   0,
              0.27035,    0,          0.36435,   0,        0.37429,   0,   endeffector_z,
              0.069,      0,          0.0690,    0,        0.010,     0,   0,
              -pi2,       pi2,        -pi2,      pi2,      -pi2,      pi2,   0,
              0,          0,         0,          0,        0,         0,   0;
DQ_SerialManipulatorDH baxter(baxter_dh);

return baxter;

};

int main()
{
return 0;
}

#endif

[zjnkinetic]

cmakelists error,i have solved it.