nsca-ng: nsca-ng: [FATAL] Cannot bind to *:5668: Invalid argument

After the recent nsca-ng update it no longer starts:

nsca-ng: [FATAL] Cannot bind to *:5668: Invalid argument

My nsca-ng config is fairly simple:

# cat /etc/nsca-ng.cfg
command_file = "/var/icinga/rw/icinga.cmd"

authorize "*" {
password = "XXX"
hosts = ".*"
services = ".*"
}

I don't recall if the previous version was listening on v4, v6 or
both.
It starts for example with:
nsca-ng -b 127.0.0.1

Thanks,
Florian

--
I'm not entirely sure you are real.