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# rust-openssl
[](https://travis-ci.org/sfackler/rust-openssl)
[Documentation](https://sfackler.github.io/rust-openssl/doc/v0.6.7/openssl).
## Building
rust-openssl depends on both the OpenSSL runtime libraries and headers.
### Linux
On Linux, you can install OpenSSL via your package manager. The headers are
sometimes provided in a separate package than the runtime libraries - look for
something like `openssl-devel` or `libssl-dev`.
```bash
# On Ubuntu
sudo apt-get install libssl-dev
# On Arch Linux
sudo pacman -S openssl
```
### OSX
OpenSSL 0.9.8 is preinstalled on OSX. Some features are only available when
linking against OpenSSL 1.0.0 or greater; see below on how to point
rust-openssl to a separate installation.
### Windows
On Windows, consider building with [mingw-w64](http://mingw-w64.org/).
Build script will try to find mingw in `PATH` environment variable to provide
Cargo with location where openssl libs from mingw-w64 package may be found.
If you followed guide [Building on Windows](https://github.com/rust-lang/rust#building-on-windows)
from rust repo, then you should have [MSYS2](http://msys2.github.io/) with
`mingw-w64-openssl` installed as part of `mingw-w64-x86_64-toolchain`
(or `mingw-w64-i686-toolchain`) package.
Alternatively, install OpenSSL from [here][1]. Cargo will not be able to find OpenSSL if it's
installed to the default location. You can either copy the `include/openssl`
directory, `libssl32.dll`, and `libeay32.dll` to locations that Cargo can find
or pass the location to Cargo via environment variables:
```bash
env OPENSSL_LIB_DIR=C:/OpenSSL-Win64 OPENSSL_INCLUDE_DIR=C:/OpenSSL-Win64/include cargo build
```
### Manual configuration
rust-openssl's build script will by default attempt to locate OpenSSL via
pkg-config. This will not work in some situations, for example, on systems that
don't have pkg-config, when cross compiling, or when using a copy of OpenSSL
other than the normal system install.
The build script can be configured via environment variables:
* `OPENSSL_LIB_DIR` - If specified, a directory that will be used to find
OpenSSL runtime libraries.
* `OPENSSL_INCLUDE_DIR` - If specified, a directory that will be used to find
OpenSSL headers.
* `OPENSSL_STATIC` - If specified, OpenSSL libraries will be statically rather
than dynamically linked.
If either `OPENSSL_LIB_DIR` or `OPENSSL_INCLUDE_DIR` are specified, then the
build script will skip the pkg-config step.
[1]: http://slproweb.com/products/Win32OpenSSL.html
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