[build2] manifest error while installing

[Boris Kolpackov]

Bo Lorentsen <bl at lue.dk> writes:

> Ok, this worked for me too, on a different network, so strange. Is it a IPv6
> only site or something in that direction ?

The host is IPv6-enabled but not IPv6-only. If you can still reproduce
the issue, could you run the following and send the transcript:

curl --verbose https://pkg.cppget.org/1/alpha/repositories.manifest