To retrieve, you'll need "git". Once "git" installed on your computer, to get it in read-only mode do:
git clone git://rcopensource.git.sourceforge.net/gitroot/rcopensource
If you want to contribute to the project, you are more than welcome. The entire project can be retrieved with:
git clone ssh://
Rcopensource project page is here: https://sourceforge.net/projects/rcopensource/develop
Read the file README and COMPILE before starting.