Problem in installing rtt ros package (groovy, utuntu 12.04)

Dear orocos users

Sorry for the repeat post.

I am just starting to use orocos rtt. I check it out from the source which comes from use command git clone then I get the file structure like (in orocos_toolchains) CMakeLists.txt Makefile orocos_toolchain rtt stack.xml utilmm log4cpp ocl orogen rtt_typelib typelib utilrb

The problem is that I found the all folders almost empty. e.g. rtt folder is empty, no any file.

When I use catkin_make this folder, there is no any building result. I am not quite sure whether I am right. or maybe there are intall tutorial

If you have any comment, please let me know.