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# Using Nixpkgs {#part-using}

     

       
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```{=include=} chapters

     

       
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using/platform-support.chapter.md

     

       
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using/configuration.chapter.md

     

       
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using/overlays.chapter.md

     

       
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using/overrides.chapter.md

     

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# Platform Support {#chap-platform-support}

     

       
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Packages receive varying degrees of support, both in terms of maintainer attention and available computation resources for continuous integration (CI).

     

       
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Below is the list of the best supported platforms:

     

       
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- `x86_64-linux`: Highest level of support.

     

       
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- `aarch64-linux`: Well supported, with most packages building successfully in CI.

     

       
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- `aarch64-darwin`: Receives better support than `x86_64-darwin`.

     

       
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- `x86_64-darwin`: Receives some support.

     

       
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There are many other platforms with varying levels of support.

     

       
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The provisional platform list in [Appendix A] of [RFC046], while not up to date, can be used as guidance.

     

       
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A more formal definition of the platform support tiers is provided in [RFC046], but has not been fully implemented yet.

     

       
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[RFC046]: https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md

     

       
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[Appendix A]: https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#appendix-a-non-normative-description-of-platforms-in-november-2019