ROS gpsd client Subscriber node (fix)

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I want to write subscriber node for ROS GPSD client which is publishing GPS coordinates on topic "/fix". I don't know exactly what would be the right code and what changes I have to make in CMakeList.txt and package.xml. Below is the code

#include <ros/ros.h>
#include <sensor_msgs/NavSatStatus.h>  
#include <sensor_msgs/NavSatFix.h>
using namespace gps_common;
void callback(const sensor_msgs::NavSatFixConstPtr& fix) {
  if (fix->status.status == sensor_msgs::NavSatStatus::STATUS_NO_FIX) {
   ROS_INFO("No fix.");
   return;
 }

 if (fix->header.stamp == ros::Time(0)) {
   return;
}
printf("\n Latitude = %f and Logitude = %f ",fix->latitude, fix->logitude);  
}

int main (int argc, char **argv) {
 ros::init(argc, argv, "gps_collect");
 ros::NodeHandle node;
 ros::Subscriber fix_sub = node.subscribe("fix", 10, callback);
 ros::spin();
 return 0;
}