From 84d4358635031c4e86a30f71b5ccd37462a94821 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Wed, 16 Oct 2013 23:05:42 +0200
Subject: [PATCH] Fix compatibility with Nix < 1.6

Nix 1.6 (accidentally) changed the semantics of strings like
"${path}/bla", so this happened to work on 1.6 but not before.
---
 nixos/modules/misc/version.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/nixos/modules/misc/version.nix b/nixos/modules/misc/version.nix
index e9ee476d36a..1b519d3e6ee 100644
--- a/nixos/modules/misc/version.nix
+++ b/nixos/modules/misc/version.nix
@@ -26,10 +26,10 @@ with pkgs.lib;
   config = {
 
     system.nixosVersion =
-      mkDefault (builtins.readFile "${pkgs.path}/.version" + config.system.nixosVersionSuffix);
+      mkDefault (builtins.readFile "${toString pkgs.path}/.version" + config.system.nixosVersionSuffix);
 
     system.nixosVersionSuffix =
-      let suffixFile = "${pkgs.path}/.version-suffix"; in
+      let suffixFile = "${toString pkgs.path}/.version-suffix"; in
       mkDefault (if builtins.pathExists suffixFile then builtins.readFile suffixFile else "pre-git");
 
     # Note: code names must only increase in alphabetical order.