=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching ptlib-2.10.7.tar.xz
=> Total size: 2420924 bytes
ftp: Error retrieving file `503 Backend unavailable, connection failed'
fetch: Unable to fetch expected file ptlib-2.10.7.tar.xz
=> Checksum SHA1 OK for ptlib-2.10.7.tar.xz
=> Checksum RMD160 OK for ptlib-2.10.7.tar.xz
=> Checksum SHA512 OK for ptlib-2.10.7.tar.xz