=> Bootstrap dependency digest>=20010302: found digest-20160304
=> Fetching ck-0.5.1.tar.gz
=> Total size: 212506 bytes
ftp: Error retrieving file `404 Not Found'
fetch: Unable to fetch expected file ck-0.5.1.tar.gz
=> Checksum SHA1 OK for ck-0.5.1.tar.gz
=> Checksum RMD160 OK for ck-0.5.1.tar.gz
=> Checksum SHA512 OK for ck-0.5.1.tar.gz