I did try first to install manually, using make, I don't know if now I have a mess of libraries, should I remove every dependency with pacman? I will try again doing it manually and post back any issue.
ismaelvc@toybox ~ [1]> pacman -Qs llvm
local/clang 3.4-1
C language family frontend for LLVM
local/llvm 3.4-1
Low Level Virtual Machine
local/llvm-libs 3.4-1
Low Level Virtual Machine (runtime library)
ismaelvc@toybox ~>
