Update to 9.9.10, 9.10.5, 9.11.1 and 9.12 to latest snapshot.
While there:
Make it more maintainable by sorting stuff in the Makefile and removing
vestigial pre 10.3 things.
Refresh the root zone hints.
"Fix" the configuration section telling you to get some top level
zones from f.root-servers.net, which does not allow axfr any more. [1]
PR: 218656 [1]
Reported by: Thomas Steen Rasmussen / Tykling [1]
MFH: 2017Q2
Sponsored by: Absolight