How to install clang from source

i have been searching a lot on internet form instruction to build clang-3.6 for unreal build
even from official site it only installed llvm

And using archive.archlinux for clang after installation give error libffi.so.6 not found

plz tell me how to install it

well its a dump thing i was checking around the llvm-project source directory and deep inside it i found clang README why does they hide it like a treasure in it i was given to copy clang to llvm/tools then i ran cmake then make clang worked .
sorry for wasting your time

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