"Address family not supported by protocol" message in MRG

Issue

I noticed following warnings in our MRG-M 3.2 log files:

2016-02-09 13:48:25 [Network] info Listening to: 0.0.0.0:20202
2016-02-09 13:48:25 [Network] info Listening to: [::]:20202
2016-02-09 13:48:25 [Network] warning Couldn't listen to: [::]:20202: Address family not supported by protocol (/builddir/build/BUILD/qpid-cpp-0.34/src/qpid/sys/     posix/BSDSocket.cpp:105)
2016-02-09 13:48:25 [Network] notice Listening on TCP/TCP6 port 20202
2016-02-09 13:48:25 [Network] info Listening to: 0.0.0.0:10202
2016-02-09 13:48:25 [Network] info Listening to: [::]:10202
2016-02-09 13:48:25 [Network] warning Couldn't listen to: [::]:10202: Address family not supported by protocol (/builddir/build/BUILD/qpid-cpp-0.34/src/qpid/sys/     posix/BSDSocket.cpp:105)

It looks like the broker is trying to open a listener for the TCP/SSL ports on IPv6 ([::]) and fails doing so. As far as I know, our servers don't use IPv6.