From a93d01fb4d66addd20afb3c8eba982ee80fdc9a8 Mon Sep 17 00:00:00 2001
From: Robert Helgesson <robert@rycee.net>
Date: Sat, 26 Oct 2019 16:37:52 +0200
Subject: [PATCH] faq: describe how to install Nixpkgs unstable packages

---
 FAQ.md | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/FAQ.md b/FAQ.md
index 141ecc6ea..a83a90f6c 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -119,3 +119,33 @@ The solution on NixOS is to add
     services.dbus.packages = with pkgs; [ gnome3.dconf ];
 
 to your system configuration.
+
+How do I install packages from Nixpkgs unstable?
+------------------------------------------------
+
+If you are using a stable version of Nixpkgs but would like to install
+some particular packages from Nixpkgs unstable then you can import the
+unstable Nixpkgs and refer to its packages within your configuration.
+Something like
+
+```nix
+{ pkgs, config, ... }:
+
+let
+
+  pkgsUnstable = import <nixpkgs-unstable> {};
+
+in
+
+{
+  home.packages = [
+    pkgsUnstable.foo
+  ];
+
+  # …
+}
+```
+
+should work provided you have a Nix channel called `nixpkgs-unstable`.
+Note, the package will not be affected by any package overrides,
+overlays, etc.