Arduino IMU Error - Githubissues

While Uploading my Arduino code I have these following Errors
Arduino: 1.8.7 (Linux), Board: "Arduino Nano, ATmega328P"

/home/hitesh/cart_ws/src/acs/razor_imu_9dof/src/Razor_AHRS/Razor_AHRS.ino: In function 'void read_sensors()':
Razor_AHRS:584:13: error: 'Read_Gyro' was not declared in this scope
   // Normally using x-z-plane-component/y-component of compensated gravity vector
             ^
Razor_AHRS:585:14: error: 'Read_Accel' was not declared in this scope
   // roll = atan2(temp2[1], sqrt(temp2[0] * temp2[0] + temp2[2] * temp2[2]));
              ^
Razor_AHRS:586:13: error: 'Read_Magn' was not declared in this scope
   // Since we compensated for pitch, x-z-plane-component equals z-component:
             ^
/home/hitesh/cart_ws/src/acs/razor_imu_9dof/src/Razor_AHRS/Razor_AHRS.ino: In function 'void compensate_sensor_errors()':
Razor_AHRS:622:78: error: 'Matrix_Vector_Multiply' was not declared in this scope
/home/hitesh/cart_ws/src/acs/razor_imu_9dof/src/Razor_AHRS/Razor_AHRS.ino: In function 'void reset_sensor_fusion()':
Razor_AHRS:655:43: error: 'Vector_Cross_Product' was not declared in this scope
Razor_AHRS:663:19: error: 'Compass_Heading' was not declared in this scope
   delay(400);  // Give sensors enough time to collect data
                   ^
Razor_AHRS:667:52: error: 'init_rotation_matrix' was not declared in this scope
/home/hitesh/cart_ws/src/acs/razor_imu_9dof/src/Razor_AHRS/Razor_AHRS.ino: In function 'void setup()':
Razor_AHRS:728:12: error: 'I2C_Init' was not declared in this scope
         else if (output_param == 'c') // Go to _c_alibration mode
            ^
Razor_AHRS:729:14: error: 'Accel_Init' was not declared in this scope
Razor_AHRS:730:13: error: 'Magn_Init' was not declared in this scope
           output_mode = OUTPUT__MODE_CALIBRATE_SENSORS;
             ^
Razor_AHRS:731:13: error: 'Gyro_Init' was not declared in this scope
           reset_calibration_session_flag = true;
             ^
/home/hitesh/cart_ws/src/acs/razor_imu_9dof/src/Razor_AHRS/Razor_AHRS.ino: In function 'void loop()':
Razor_AHRS:1058:91: error: 'output_calibration' was not declared in this scope
Razor_AHRS:1069:23: error: 'Compass_Heading' was not declared in this scope
Razor_AHRS:1070:21: error: 'Matrix_update' was not declared in this scope
Razor_AHRS:1071:17: error: 'Normalize' was not declared in this scope
Razor_AHRS:1072:24: error: 'Drift_correction' was not declared in this scope
Razor_AHRS:1073:20: error: 'Euler_angles' was not declared in this scope
Razor_AHRS:1076:63: error: 'output_angles' was not declared in this scope
Razor_AHRS:1087:23: error: 'Compass_Heading' was not declared in this scope
Razor_AHRS:1088:21: error: 'Matrix_update' was not declared in this scope
Razor_AHRS:1089:17: error: 'Normalize' was not declared in this scope
Razor_AHRS:1090:24: error: 'Drift_correction' was not declared in this scope
Razor_AHRS:1091:20: error: 'Euler_angles' was not declared in this scope
Razor_AHRS:1094:85: error: 'output_both_angles_and_sensors_text' was not declared in this scope
Razor_AHRS:1098:64: error: 'output_sensors' was not declared in this scope
/home/hitesh/cart_ws/src/acs/razor_imu_9dof/src/Razor_AHRS/DCM.ino: In function 'void Normalize()':
DCM:12:65: error: 'Vector_Dot_Product' was not declared in this scope
   error= -Vector_Dot_Product(&DCM_Matrix[0][0],&DCM_Matrix[1][0])*.5; //eq.19
                                                                 ^
DCM:14:58: error: 'Vector_Scale' was not declared in this scope
   Vector_Scale(&temporary[0][0], &DCM_Matrix[1][0], error); //eq.19
                                                          ^
DCM:17:67: error: 'Vector_Add' was not declared in this scope
   Vector_Add(&temporary[0][0], &temporary[0][0], &DCM_Matrix[0][0]);//eq.19
                                                                   ^
DCM:20:74: error: 'Vector_Cross_Product' was not declared in this scope
   Vector_Cross_Product(&temporary[2][0],&temporary[0][0],&temporary[1][0]); // c= a x b //eq.20
                                                                          ^
/home/hitesh/cart_ws/src/acs/razor_imu_9dof/src/Razor_AHRS/DCM.ino: In function 'void Drift_correction()':
DCM:54:77: error: 'Vector_Cross_Product' was not declared in this scope
   Vector_Cross_Product(&errorRollPitch[0],&Accel_Vector[0],&DCM_Matrix[2][0]); //adjust the ground of reference
                                                                             ^
DCM:55:72: error: 'Vector_Scale' was not declared in this scope
   Vector_Scale(&Omega_P[0],&errorRollPitch[0],Kp_ROLLPITCH*Accel_weight);
                                                                        ^
DCM:58:44: error: 'Vector_Add' was not declared in this scope
   Vector_Add(Omega_I,Omega_I,Scaled_Omega_I);     
                                            ^
/home/hitesh/cart_ws/src/acs/razor_imu_9dof/src/Razor_AHRS/DCM.ino: In function 'void Matrix_update()':
DCM:85:53: error: 'Vector_Add' was not declared in this scope
   Vector_Add(&Omega[0], &Gyro_Vector[0], &Omega_I[0]);  //adding proportional term
                                                     ^
DCM:113:60: error: 'Matrix_Multiply' was not declared in this scope
   Matrix_Multiply(DCM_Matrix,Update_Matrix,Temporary_Matrix); //a*b=c
                                                            ^
exit status 1
'Read_Gyro' was not declared in this scope
What are the Arduino libraries required for these?
pololu / minimu-9-ahrs-arduino

Arduino IMU Error #23
