From 2d3a1e839e4839ab2f575ea2226b4003ae65dd4b Mon Sep 17 00:00:00 2001
From: Erik Arvstedt <erik.arvstedt@gmail.com>
Date: Sat, 2 May 2020 18:07:21 +0200
Subject: [PATCH] electrs: fix conditional cargoSha256

---
 pkgs/electrs/default.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkgs/electrs/default.nix b/pkgs/electrs/default.nix
index 05202cb..e29efd6 100644
--- a/pkgs/electrs/default.nix
+++ b/pkgs/electrs/default.nix
@@ -13,8 +13,8 @@ rustPlatform.buildRustPackage rec {
   nativeBuildInputs = [ llvmPackages.clang ];
   LIBCLANG_PATH = "${llvmPackages.libclang}/lib";
 
-  cargoSha256 = if pkgs ? cargo-vendor then
-    # nixpkgs ≤ 19.09
+  cargoSha256 = if builtins.pathExists "${pkgs.path}/pkgs/build-support/rust/fetchcargo.nix" then
+    # nixpkgs ≤ 20.03
     "19qs8if8fmygv6j74s6iwzm534fybwasjvmzdqcl996xhg75w6gi"
   else
     # for recent nixpkgs with cargo-native vendoring (introduced in nixpkgs PR #69274)