=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching corewars-0.9.13.tar.gz
=> Total size: 203874 bytes
ftp: Error retrieving file `503 Backend unavailable, connection failed'
fetch: Unable to fetch expected file corewars-0.9.13.tar.gz
=> Checksum SHA1 OK for corewars-0.9.13.tar.gz
=> Checksum RMD160 OK for corewars-0.9.13.tar.gz
=> Checksum SHA512 OK for corewars-0.9.13.tar.gz