=> Bootstrap dependency digest>=20010302: found digest-20160304
=> Fetching llvm-3.8.1.src.tar.xz
=> Total size: 16551472 bytes
ftp: Error retrieving file `404 Not Found'
fetch: Unable to fetch expected file llvm-3.8.1.src.tar.xz
=> Checksum SHA1 OK for llvm-3.8.1.src.tar.xz
=> Checksum RMD160 OK for llvm-3.8.1.src.tar.xz
=> Checksum SHA512 OK for llvm-3.8.1.src.tar.xz