Unbound is a validating, recursive, and caching DNS resolver.

The C implementation of Unbound is developed and maintained by NLnet
Labs. It is based on ideas and algorithms taken from a java prototype
developed by Verisign labs, Nominet, Kirei and ep.net.

Unbound is designed as a set of modular components, so that also
DNSSEC (secure DNS) validation and stub-resolvers (that do not run
as a server, but are linked into an application) are easily possible.

1. build dependencies:
   1. libldns-devel
   2. libldns-examples
   3. /proc
   4. libssl-devel
   5. flex
   6. gcc-c++
   7. splint
   8. swig
   9. python-devel
   10. libevent-devel
   11. libexpat-devel
   12. xxd
   13. bind-utils