From 34487947ce665d14c340719d844de0be08d7c85f Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Thu, 1 Mar 2018 14:58:15 -0500
Subject: [PATCH] nixos: Add nixpkgs.crossSystem option for cross-compilation

---
 nixos/modules/misc/nixpkgs.nix | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/misc/nixpkgs.nix b/nixos/modules/misc/nixpkgs.nix
index 11bd148d5dee..9217250eec29 100644
--- a/nixos/modules/misc/nixpkgs.nix
+++ b/nixos/modules/misc/nixpkgs.nix
@@ -61,7 +61,7 @@ in
             inherit (config.nixpkgs) config overlays system;
           }
         '';
-      default = import ../../.. { inherit (cfg) config overlays system; };
+      default = import ../../.. { inherit (cfg) config overlays system crossSystem; };
       type = pkgsType;
       example = literalExample ''import <nixpkgs> {}'';
       description = ''
@@ -130,6 +130,18 @@ in
       '';
     };
 
+    crossSystem = mkOption {
+      type = types.nullOr types.attrs;
+      default = null;
+      description = ''
+        The description of the system we're cross-compiling to, or null
+        if this isn't a cross-compile. See the description of the
+        crossSystem argument in the nixpkgs manual.
+
+        Ignored when <code>nixpkgs.pkgs</code> is set.
+      '';
+    };
+
     system = mkOption {
       type = types.str;
       example = "i686-linux";