=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching ns-src-2.35.tar.gz
=> Total size: 43897172 bytes
ftp: Error retrieving file `503 Backend unavailable, connection timeout'
fetch: Unable to fetch expected file ns-src-2.35.tar.gz
=> Checksum SHA1 OK for ns-src-2.35.tar.gz
=> Checksum RMD160 OK for ns-src-2.35.tar.gz
=> Checksum SHA512 OK for ns-src-2.35.tar.gz