From 9f61ec7d27dfbaea69be5bb43304ecb5ce4ac4e3 Mon Sep 17 00:00:00 2001
From: zimbatm <zimbatm@zimbatm.com>
Date: Fri, 20 Dec 2019 15:43:07 +0100
Subject: [PATCH] mkUserEnvironment: polyfill for older versions of nix

---
 lib/mkUserEnvironment.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/mkUserEnvironment.nix b/lib/mkUserEnvironment.nix
index 03b7495..1e00896 100644
--- a/lib/mkUserEnvironment.nix
+++ b/lib/mkUserEnvironment.nix
@@ -21,6 +21,9 @@
 # Supporting code
 with builtins;
 let
+  # back-compat
+  isPath = builtins.isPath or (x: builtins.typeOf x == "path");
+
   # Escape Nix strings
   stringEscape = str:
     "\"" + (