From 810075cd3d9d9b8fcca1bb9e22c1b5c190f95473 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 31 Mar 2020 12:55:35 +0200
Subject: [PATCH] Update to 20.03

---
 flake.nix | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/flake.nix b/flake.nix
index 8acea7c3..edb8e4d6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,7 +3,7 @@
 
   edition = 201909;
 
-  inputs.nixpkgs.uri = "nixpkgs/release-19.09";
+  inputs.nixpkgs.url = "nixpkgs/nixos-20.03";
 
   outputs = { self, nixpkgs, nix }:
     let
@@ -108,7 +108,9 @@
               perlDeps perl final.nix
               postgresql95 # for running the tests
               boost
-              (nlohmann_json.override { multipleHeaders = true; })
+              (if lib.versionAtLeast lib.version "20.03pre"
+               then nlohmann_json
+               else nlohmann_json.override { multipleHeaders = true; })
             ];
 
           hydraPath = lib.makeBinPath (