=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching checkseum-0.1.0.tar.gz
=> Total size: 32124 bytes
ftp: Error retrieving file `503 Backend unavailable, connection failed'
fetch: Unable to fetch expected file checkseum-0.1.0.tar.gz
=> Checksum SHA1 OK for checkseum-0.1.0.tar.gz
=> Checksum RMD160 OK for checkseum-0.1.0.tar.gz
=> Checksum SHA512 OK for checkseum-0.1.0.tar.gz