Hi!
What about Debian/Ubuntu packages?
This would significantly help using LLVM because a simple "aptitude
install llvm" would install it ready for use.
There are packages in Debian, but unfortunately they are very old (1.8).
I tried to email the maintainer but got no response.
Then I tried to update myself by "apt-get source llvm", "uupdate" and
modifying Debian scripts but I am too unexperienced. 
Peter