# Third-party notices

## zlib 1.3.1

Native gzip support vendors the C source from [madler/zlib v1.3.1](https://github.com/madler/zlib/releases/tag/v1.3.1), released on 2024-01-22. The release tag is verified upstream. `scripts/prepare_zlib.ps1` downloads `v1.3.1.tar.gz` and requires SHA-256 `17E88863F3600672AB49182F217281B6FC4D3C762BDE361935E436A95214D05C` before copying the minimal zlib source set into `native/gzip`.

The upstream zlib license is preserved as `native/gzip/LICENSE`.

The repository applies a small portability include in `native/gzip/gzguts.h`
so POSIX descriptor functions are declared when the bundled source is compiled
with the stricter Clang configuration used by macOS CI. The zlib algorithms and
license text are otherwise unchanged.