what to include?

edit

Hi all,i'm very new in ROS so sorry if my question is silly..

i've read the tutorials on ros,now i'm triyng to control the turtlesim to make a square (an exercise) so i'm doing:

#include <turtlesim/Pose.h>
#include <turtlesim/Velocity.h>

to use their topic,but when i make it it says that pose.h does not exist:what's the problem?

i'm in the beginner_tutorials package,maybe is that it doesn't find pose.h in this package?if so, how can i include pose.h from its package? thanks all