=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching oily_png-1.2.1.gem
=> Total size: 64512 bytes
ftp: Error retrieving file `503 Backend unavailable, connection timeout'
fetch: Unable to fetch expected file oily_png-1.2.1.gem
=> Checksum SHA1 OK for oily_png-1.2.1.gem
=> Checksum RMD160 OK for oily_png-1.2.1.gem
=> Checksum SHA512 OK for oily_png-1.2.1.gem