Hi Vu,
If you are learning ROS I suggest that you do not start by using trunk.  
It is unstable and documentation may be out of date or missing.  The 
only people recommended to run off of trunk are the developers of the 
stack or package. 

Please try out the recommended installations 
http://www.ros.org/wiki/ROS/Installation  And then please try the 
tutorials at http://www.ros.org/wiki/ROS/Tutorials and read the 
documentation http://www.ros.org/wiki/ROS/Concepts

After you are familiar with the system you should have enough knowledge 
to get whichever version of a package you want.

Tully

Vu Hong Thuan wrote:
> Hi all,
> I'm newbie with ROS.
> I want to test some packages existing in trunk. How can i build it?
> Thank.
>
> _______________________________________________
> ros-users mailing list
> ros-users@code.ros.org
> https://code.ros.org/mailman/listinfo/ros-users
>