Chỉ cần tạo file sau
/etc/yum.repos.d/llvm.repo có nội dung[alonid-llvm-3.9.0]
name=Copr repo for llvm-3.9.0 owned by alonid
baseurl=https://copr-be.cloud.fedoraproject.org/results/alonid/llvm-3.9.0/epel-7-$basearch/
type=rpm-md
skip_if_unavailable=True
gpgcheck=1
gpgkey=https://copr-be.cloud.fedoraproject.org/results/alonid/llvm-3.9.0/pubkey.gpg
repo_gpgcheck=0
enabled=1
enabled_metadata=1
Sau đó thực hiện cài bằng yum :
yum install clang-3.9.0