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Document how to use packages with extensions. (#145011)

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Co-authored-by: Artturi <Artturin@artturin.com>
Co-authored-by: Sandro <sandro.jaeckel@gmail.com>
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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23
nixos/doc/manual/configuration/customizing-packages.section.md
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@ -12,6 +12,29 @@ Unfortunately, Nixpkgs currently lacks a way to query available
configuration options.
:::
::: {.note}
Alternatively, many packages come with extensions one might add.
Examples include:
- [`passExtensions.pass-otp`](https://search.nixos.org/packages/query=passExtensions.pass-otp)
- [`python310Packages.requests`](https://search.nixos.org/packages/query=python310Packages.requests)
You can use them like this:
```nix
environment.systemPackages = with pkgs; [
sl
(pass.withExtensions (subpkgs: with subpkgs; [
pass-audit
pass-otp
pass-genphrase
]))
(python3.withPackages (subpkgs: with subpkgs; [
requests
]))
cowsay
];
```
:::
Apart from high-level options, it's possible to tweak a package in
almost arbitrary ways, such as changing or disabling dependencies of a
package. For instance, the Emacs package in Nixpkgs by default has a