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### PCL KdTree Undefined Symbol

Hello ROS Community,

I am fairly new to ROS but not to robotics or programming. I have been working with PCL and ROS and was trying to do a simple cluster extraction seen here. I can build and run the code but when I run the code I get the following error:

 symbol lookup error: /var/CornholeRobot/devel/lib/cornhole_vision/main: undefined symbol: _ZN3pcl6search6KdTreeINS_8PointXYZEEC1Eb

My set up is:

• Ubuntu 14.04 LST
• ROS Indigo Latest Build
• PCL latest stable through apt-get

What I Have done:

• Followed all steps on this post
• Looked at every google post for the undefined symbol

Everything works fine except for when i try to use the KdTree in this line of code:

pcl::search::KdTree"pcl::PointXYZ"::Ptr tree  (new pcl::search::KdTree"pcl::PointXYZ");
So for example I can run and execute planar segmentation to remove the ground plane perfectly fine. I'm not sure if this is something i need to do in the CMakeLists.txt file or maybe my includes are wrong? Here are my includes (in the order that I have them):
#include "ros/ros.h"
#include "iostream"
#include "unistd.h" //PCL Includes
#include "sensor_msgs/PointCloud2.h"
#include "pcl_conversions/pcl_conversions.h"
#include "pcl/point_cloud.h"
#include "pcl/point_types.h"
#include "pcl/io/pcd_io.h"
#include "pcl/filters/extract_indices.h"
#include "pcl/filters/voxel_grid.h"
#include "pcl/features/normal_3d.h"
#include "pcl/search/kdtree.h"
#include "pcl/sample_consensus/model_types.h"
#include "pcl/sample_consensus/method_types.h"
#include "pcl/segmentation/sac_segmentation.h"
#include "pcl/filters/conditional_removal.h"
#include "pcl/segmentation/extract_clusters.h"


If you have any information that could help me that would be great and if you need any additional information just let me know.

PS: had to change the carets to quotes if someone can let me know if there is a way to use the carets (sideways v), in the forum, that would be great as well

### PCL KdTree Undefined Symbol

Hello ROS Community,

I am fairly new to ROS but not to robotics or programming. I have been working with PCL and ROS and was trying to do a simple cluster extraction seen here. I can build and run the code but when I run the code I get the following error:

 symbol lookup error: /var/CornholeRobot/devel/lib/cornhole_vision/main: undefined symbol: _ZN3pcl6search6KdTreeINS_8PointXYZEEC1Eb

My set up is:

• Ubuntu 14.04 LST
• ROS Indigo Latest Build
• PCL latest stable through apt-get

What I Have done:

• Followed all steps on this post
• Looked at every google post for the undefined symbol

Everything works fine except for when i try to use the KdTree in this line of code:

pcl::search::KdTree"pcl::PointXYZ"::Ptr pcl::search::KdTree<pcl::PointXYZ>::Ptr tree  (new pcl::search::KdTree"pcl::PointXYZ");pcl::search::KdTree<pcl::PointXYZ>);
So for example I can run and execute planar segmentation to remove the ground plane perfectly fine. I'm not sure if this is something i need to do in the CMakeLists.txt file or maybe my includes are wrong? Here are my includes (in the order that I have them):
#include "ros/ros.h"
#include "iostream"
#include "unistd.h" 
#include <ros/ros.h>
#include <iostream>
#include <unistd.h>
//PCL Includes
#include "sensor_msgs/PointCloud2.h"
#include "pcl_conversions/pcl_conversions.h"
#include "pcl/point_cloud.h"
#include "pcl/point_types.h"
#include "pcl/io/pcd_io.h"
#include "pcl/filters/extract_indices.h"
#include "pcl/filters/voxel_grid.h"
#include "pcl/features/normal_3d.h"
#include "pcl/search/kdtree.h"
#include "pcl/sample_consensus/model_types.h"
#include "pcl/sample_consensus/method_types.h"
#include "pcl/segmentation/sac_segmentation.h"
#include "pcl/filters/conditional_removal.h"
#include "pcl/segmentation/extract_clusters.h"
<sensor_msgs/PointCloud2.h>
#include <pcl_conversions/pcl_conversions.h>
#include <pcl/point_cloud.h>
#include <pcl/point_types.h>
#include <pcl/io/pcd_io.h>
#include <pcl/filters/extract_indices.h>
#include <pcl/filters/voxel_grid.h>
#include <pcl/features/normal_3d.h>
#include <pcl/search/kdtree.h>
#include <pcl/sample_consensus/model_types.h>
#include <pcl/sample_consensus/method_types.h>
#include <pcl/segmentation/sac_segmentation.h>
#include <pcl/filters/conditional_removal.h>
#include <pcl/segmentation/extract_clusters.h>
 

If you have any information that could help me that would be great and if you need any additional information just let me know.

PS: had to change the carets to quotes if someone can let me know if there is a way to use the carets (sideways v), in the forum, that would be great as well

Edit 1: Just in case anyone wants to see the CMakeLists.txt here it is:


cmake_minimum_required(VERSION 2.8.3)
project(cornhole_vision)

find_package(catkin REQUIRED COMPONENTS
pcl_conversions
pcl_ros
roscpp
sensor_msgs
)

catkin_package(
)

include_directories(
include
${catkin_INCLUDE_DIRS} ) add_executable(main src/main.cpp) target_link_libraries(main${catkin_LIBRARIES}  /usr/lib/libpcl_kdtree.so)