Hi all, I have successfully rosmaked the Correpsondence Grouping Tutorial(a tutorial in PCL), and now I want to send a message to a topic if I recognized the target in correspondence grouping. However, the correspondence grouping tutorial doesn't use any thing about ros before, so I wonder to know how to emerge ROS in this tutorial. I tried to add the code like the tutorial: WritingPublisherSubscriber(c++)(http ://www.ros.org/wiki/ROS/Tutorials/WritingPublisherSubscriber%28c%2B%2B%29), and modified my cmakelist, but I always get the error:
CMakeFiles/correspondencegrouping.dir/correspondencegrouping.cpp.o: In function main': correspondence_grouping.cpp:(.text+0xa1f): undefined reference toros::Publisher::~Publisher()' correspondencegrouping.cpp:(.text+0x1de6): undefined reference to `ros::console::ginitialized' correspondence_grouping.cpp:(.text+0x1df5): undefined reference to `ros::console::initialize()'

So, does anyone knows how to solve this?