From 5b511ca6f33ac0a5b0eda435e05aa4465d1ee79c Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Sat, 22 May 2021 23:01:18 +0100
Subject: [PATCH] python3Packages.pyvex: fix build for darwin

---
 pkgs/development/python-modules/pyvex/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/python-modules/pyvex/default.nix b/pkgs/development/python-modules/pyvex/default.nix
index 618dfef4171..c9fbedbbfd4 100644
--- a/pkgs/development/python-modules/pyvex/default.nix
+++ b/pkgs/development/python-modules/pyvex/default.nix
@@ -18,6 +18,10 @@ buildPythonPackage rec {
     sha256 = "sha256-cWQdrGKJyGieBow3TiMj/uB2crIF32Kvl5tVUKg/z+E=";
   };
 
+  postPatch = lib.optionalString stdenv.isDarwin ''
+    substituteInPlace vex/Makefile-gcc --replace '/usr/bin/ar' 'ar'
+  '';
+
   propagatedBuildInputs = [
     archinfo
     bitstring