1# Unbound 2 3[](https://github.com/NLnetLabs/unbound/actions) 4[](https://repology.org/project/unbound/versions) 5[](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:unbound) 6[](https://unbound.readthedocs.io/en/latest/?badge=latest) 7[](https://fosstodon.org/@nlnetlabs) 8 9Unbound is a validating, recursive, caching DNS resolver. It is designed to be 10fast and lean and incorporates modern features based on open standards. If you 11have any feedback, we would love to hear from you. Don’t hesitate to 12[create an issue on Github](https://github.com/NLnetLabs/unbound/issues/new) 13or post a message on the [Unbound mailing list](https://lists.nlnetlabs.nl/mailman/listinfo/unbound-users). 14You can learn more about Unbound by reading our 15[documentation](https://unbound.docs.nlnetlabs.nl/). 16 17## Compiling 18 19Make sure you have the C toolchain, OpenSSL and its include files, and libexpat 20installed. 21If building from the repository source you also need flex and bison installed. 22Unbound can be compiled and installed using: 23 24``` 25./configure && make && make install 26``` 27 28You can use libevent if you want. libevent is useful when using many (10000) 29outgoing ports. By default max 256 ports are opened at the same time and the 30builtin alternative is equally capable and a little faster. 31 32Use the `--with-libevent` configure option to compile Unbound with libevent 33support. 34 35## Unbound configuration 36 37All of Unbound's configuration options are described in the man pages, which 38will be installed and are available on the Unbound 39[documentation page](https://unbound.docs.nlnetlabs.nl/). 40 41An example configuration file is located in 42[doc/example.conf](https://github.com/NLnetLabs/unbound/blob/master/doc/example.conf.in). 43
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