A build issue with the BIND9 packages in Mandriva Linux 2009.0 prevents IPv6 from working correctly. This is due to POSIX not including the IPv6 Advanced Socket API, so glibc hides parts of this API as a result. The end result is a breakage in how IPv6 works. Compiling BIND9 with -D_GNU_SOURCE fixes this issue, and the updated packages use this additional flag.