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# How to install spglib C-API
## Download
The source code is downloaded at <https://github.com/spglib/spglib/releases> or you can
git-clone the spglib repository by
```
% git clone https://github.com/spglib/spglib.git
```
## Install
### Unix-like
After expanding source code, go into the source code directory:
```
% tar xvfz spglib-2.0.0.tar.gz
% cd spglib-2.0.0
```
Build and install in `_build` directory by
```bash
% mkdir _build
% cd _build
% cmake ..
% cmake --build .
% cmake --install (probably installed under /usr/local)
```
Or to install under the parent directory,
```bash
% mkdir _build
% cd _build
% cmake -DCMAKE_INSTALL_PREFIX=.. ..
% cmake --build .
% cmake --install . --prefix ..
```
### Windows & Cygwin
For windows, cmake behaves slightly differently and the following
way is recommended
```bash
% cmake -DCMAKE_INSTALL_PREFIX="$(shell cygpath -w "${BUILD_DIR}")" ..
% cmake --build . --config Release
% cmake --install . --config Release
```
The detail of the windows installation process is discussed in {issue}`118`.
## Usage
1. Include `spglib.h`
2. Link `libsymspg.a` or `libsymspg.so`
3. A compilation example is shown in {path}`example/README.md`.
## Example
A few examples are found in {path}`example` directory.
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