Translations:FAQ/117/en: Difference between revisions

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 This only changes what version of <code>PACKAGE_NAME</code> is available on <code>$PATH</code>. If the package you want to take from unstable is installed through a NixOS module, you must use [[overlays]]:
-<syntaxhighlight lang="nix">
-{ config, pkgs, ... }:
-let
-  unstable = import <nixos-unstable> {};
-in {
-  nixpkgs.overlays = [
-    (self: super: {
-       PACKAGE_NAME = unstable.PACKAGE_NAME;
-    })
-  ];
-}
-</syntaxhighlight>
-Note that this will rebuild all packages depending on the overlaid package, which may be a lot. Some modules offer a <code>services.foo.package</code> to change the actual derivation used by the module without and overlay, and without recompiling dependencies ([https://nixos.org/manual/nixos/stable/options.html#opt-services.gvfs.package example]).