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# How to build resvg
## General
Currently, *resvg* supports only two backend: Qt and cairo.
You can build them separately or together.
To enable a backend use the `--features` option of the `cargo`:
```bash
# Build with a Qt backend
cargo build --release --features="qt-backend"
# or with a cairo backend
cargo build --release --features="cairo-backend"
# or with both.
cargo build --release --features="qt-backend cairo-backend"
```
Also, you can build *resvg* without any backends if you what too.
### Qt backend
Qt backend requires only `QtCore` and `QtGui` libraries.
And the JPEG image format plugin (eg. `plugins/imageformats/libqjpeg.so`).
Technically, any Qt 5 version should work, but we support only Qt >= 5.6.
### cairo backend
We use `pango` for text rendering, so you have to install/build it too
with a `pangocairo` library.
## Windows
1. [Install Rust](https://www.rust-lang.org/en-US/install.html) with a
`stable-i686-pc-windows-gnu` target.
1. Install [MSYS2](http://www.msys2.org/).
### Qt backend
Only MinGW 32bit version is supported. MSVS should work too, but it is not tested.
Install Qt MinGW 32bit using an
[official installer](http://download.qt.io/official_releases/online_installers/qt-unified-windows-x86-online.exe).
In the MSYS2 Shell:
```bash
# We use Qt 5.9.3 for example.
# Prepare PATH.
export PATH="/c/Qt/5.9.3/mingw53_32/bin:/c/Qt/Tools/mingw530_32/bin:/c/Users/$USER/.cargo/bin:$PATH"
# Build.
QT_DIR=/c/Qt/5.9.3/mingw53_32 cargo.exe build --release --features "qt-backend"
```
### cairo backend
Install GTK+ dependencies using MSYS2 as explained
[here](http://gtk-rs.org/docs/requirements.html#windows).
We no need the whole GTK+, so we can install only `pango`, which will install
`cairo` too.
Then run this command in the MSYS2 MinGW Shell:
```
cargo.exe build --release --features "cairo-backend"
```
## Linux
### Qt backend
Install Qt 5 using your distributive package manager.
```
cargo build --release --features "qt-backend"
```
### cairo backend
Install `cairo` and `pango`(with `pangocairo`) using your distributive package manager.
For Ubuntu you need only `libpango1.0-dev`.
```
cargo build --release --features "cairo-backend"
```
## macOS
[Install Rust](https://www.rust-lang.org/en-US/install.html).
### Qt backend
Install Qt using an
[official installer](http://download.qt.io/official_releases/online_installers/qt-unified-mac-x64-online.dmg).
```
QT_DIR=/Users/$USER/Qt/5.9.3/clang_64 cargo build --release --features "qt-backend"
```
### cairo backend
Not supported.
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