=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching kchmviewer-7.2.1.tar.gz
=> Total size: 342665 bytes
ftp: Error retrieving file `503 Backend unavailable, connection failed'
fetch: Unable to fetch expected file kchmviewer-7.2.1.tar.gz
=> Checksum SHA1 OK for kchmviewer-7.2.1.tar.gz
=> Checksum RMD160 OK for kchmviewer-7.2.1.tar.gz
=> Checksum SHA512 OK for kchmviewer-7.2.1.tar.gz