How to update perception_pcl?

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Hi! I have ROS Electric binary install on Ubuntu 11.04. Today I need in last version of PCL 1.3 ( http://svn.pointclouds.org/ros/trunk/perception_pcl_unstable/ - this one). How should I update current stack?

I need some clarification. I have Makefile and CMakeLists.txt in /opt/ros/electric/stacks/perception_pcl. They contains only some includes. Next, I go to ./pcl directory. There is Makefile, that contains next:

TARBALL = build/pcl-1.1.2.tar.gz
TARBALL_URL = https://code.ros.org/svn/release/download/thirdparty/pcl/pcl-1.1.\
2.tar.gz
SOURCE_DIR = build/pcl
UNPACK_CMD = tar xzf
include $(shell rospack find mk)/download_unpack_build.mk

#SVN_DIR = build/pcl_trunk                                                      
## Developers, please use this URL:                                             
#SVN_URL = http://svn.pointclouds.org/pcl/trunk/                                
##SVN_PATCH =                                                                   
#SVN_REVISION=-r3434                                                            
#include $(shell rospack find mk)/svn_checkout.mk

So, when I uncomment SVN-related lines, comment tarball lines and try sudo make, I receive next:

Makefile:14: /svn_checkout.mk: No such file or directory make: * No rule to make target/svn_checkout.mk'. Stop.` (that's obvious, there is no such file). Where I'm wrong?

Thanks for help!