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# com.unity.sysroot.linux-x86_64
The Linux-x86_64 sysroot package supplies the Linux x86_64 sysroot for building Linux IL2CPP players.
You don’t need to install this package manually. The package manager automatically installs this package, along with com.unity.sysroot. You only need to install your chosen toolchain package.
For an overview of unity sysroot packages, see [Unity Sysroot Package documentation](https://docs.unity3d.com/Packages/com.unity.sysroot@0.1/manual/index.html).
This package is available as a pre-release package, so it is still in the process of becoming stable enough to release. The features and documentation in this package might change before it is ready for release.
## Installation
To install this package, refer to the instructions that match your Unity Editor version:
### Version 2021.1 and later
To install this package, make sure you[enable pre-release packages](https://docs.unity3d.com/2021.1/Documentation/Manual/class-PackageManager.html#advanced_preview)in the Unity Editor's Package Manager, and then follow the [installation instructions in the Unity User Manual](https://docs.unity3d.com/Documentation/Manual/upm-ui-install.html).
### Version 2020.3
To install this package, make sure you [show preview packages](https://docs.unity3d.com/2020.3/Documentation/Manual/class-PackageManager.html#advanced_preview) in the Unity Editor's Package Manager, and then follow the [installation instructions in the Unity User Manual](https://docs.unity3d.com/2020.3/Documentation/Manual/upm-ui-install.html).
### Version 2019.4
To install this package, make sure you [show preview packages](https://docs.unity3d.com/2019.4/Documentation/Manual/upm-ui-list.html#ShowPreview) in the Unity Editor's Package Manager, and then follow the [installation instructions in the Unity User Manual](https://docs.unity3d.com/2019.4/Documentation/Manual/upm-ui-install.html).
