1# Rustls
2
3[Rustls is a TLS backend written in Rust.](https://docs.rs/rustls/). Curl can
4be built to use it as an alternative to OpenSSL or other TLS backends. We use
5the [rustls-ffi C bindings](https://github.com/rustls/rustls-ffi/). This
6version of curl depends on version v0.7.0 of rustls-ffi.
7
8# Building with rustls
9
10First, [install Rust](https://rustup.rs/).
11
12Next, check out, build, and install the appropriate version of rustls-ffi:
13
14    % cargo install cbindgen
15    % git clone https://github.com/rustls/rustls-ffi -b v0.7.0
16    % cd rustls-ffi
17    % make
18    % make DESTDIR=${HOME}/rustls-ffi-built/ install
19
20Now configure and build curl with rustls:
21
22    % git clone https://github.com/curl/curl
23    % cd curl
24    % ./buildconf
25    % ./configure --with-rustls=${HOME}/rustls-ffi-built
26    % make
27