deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu zesty main 
deb-src http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu zesty main
deb http://apt.llvm.org/zesty/ llvm-toolchain-zesty main
deb-src http://apt.llvm.org/zesty/ llvm-toolchain-zesty main
deb http://apt.llvm.org/zesty/ llvm-toolchain-zesty-3.9 main
deb-src http://apt.llvm.org/zesty/ llvm-toolchain-zesty-3.9 main
deb http://apt.llvm.org/zesty/ llvm-toolchain-zesty-4.0 main
deb-src http://apt.llvm.org/zesty/ llvm-toolchain-zesty-4.0 main