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curl/docs/RUSTLS.md

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# Rustls
[Rustls is a TLS backend written in Rust.](https://docs.rs/rustls/). Curl can
be built to use it as an alternative to OpenSSL or other TLS backends. We use
the [crustls C bindings](https://github.com/abetterinternet/crustls/). This
version of curl depends on version v0.4.0 of crustls.
# Building with rustls
First, [install Rust](https://rustup.rs/).
Next, check out, build, and install the appropriate version of crustls:
% cargo install cbindgen
% git clone https://github.com/abetterinternet/crustls/ -b v0.4.0
% cd crustls
% make
% make DESTDIR=${HOME}/crustls-built/ install
Now configure and build curl with rustls:
% git clone https://github.com/curl/curl
% cd curl
% ./buildconf
% ./configure --without-ssl --with-rustls=${HOME}/crustls-built
% make