Pheeew, after some struggling, I finally managed to compile KDE from trunk (4.6.40) on Ubuntu Natty Alpha 1
For those whom are waiting for a step by step guide about how to build KDE SC from trunk, I will not release it until the git migration will be done. The situation now is both delicate and a little messy, with modules partially splitted over git and svn. Almost weekly, a couple of submodules are moved from svn to git, and keep track of that changes in a blog post before a reader tries to build the whole thing is not feasible.
Anyway, Merry Christmas