请问linux下编译代码的时候总是提示未定以的引用？

Question

image_transport::ImageTransport::ImageTransport(ros::NodeHandle const&)’未定义的引用
#include <ros/ros.h>
#include <image_transport/image_transport.h>
#include <opencv2/highgui/highgui.hpp>
#include <cv_bridge/cv_bridge.h>
int main(int argc, char** argv)
{
ros::init(argc, argv, "image_publisher");
ros::NodeHandle nh;
image_transport::ImageTransport it(nh);
image_transport::Publisher pub = it.advertise("camera/image", 1);
cv::Mat image = cv::imread(argv[1], CV_LOAD_IMAGE_COLOR);
sensor_msgs::ImagePtr msg = cv_bridge::CvImage(std_msgs::Header(), "bgr8", image).toImageMsg();
ros::Rate loop_rate(5);
while (nh.ok()) {
pub.publish(msg);
ros::spinOnce();
loop_rate.sleep();
}
}

Answer 1

先find 找到这个程序，然后，把这个文件所在的目录添加到PATH环境变量中，再执行就不会有not found了