From 15f425ae9c25aacea6dfd3754e9a0f7e803524ac Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Sat, 20 Nov 2021 23:39:53 +0000
Subject: [PATCH] python3Packages.libasyncns: fix build for darwin

---
 .../python-modules/libasyncns/default.nix          | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/python-modules/libasyncns/default.nix b/pkgs/development/python-modules/libasyncns/default.nix
index 38ca9b26360c..310fc54606c6 100644
--- a/pkgs/development/python-modules/libasyncns/default.nix
+++ b/pkgs/development/python-modules/libasyncns/default.nix
@@ -1,5 +1,10 @@
-{ lib, buildPythonPackage, fetchurl
-, libasyncns, pkg-config }:
+{ lib
+, stdenv
+, buildPythonPackage
+, fetchurl
+, libasyncns
+, pkg-config
+}:
 
 buildPythonPackage rec {
   pname = "libasyncns-python";
@@ -12,6 +17,11 @@ buildPythonPackage rec {
 
   patches = [ ./libasyncns-fix-res-consts.patch ];
 
+  postPatch = lib.optionalString stdenv.isDarwin ''
+    substituteInPlace resquery.c \
+      --replace '<arpa/nameser.h>' '<arpa/nameser_compat.h>'
+  '';
+
   buildInputs = [ libasyncns ];
   nativeBuildInputs = [ pkg-config ];
   doCheck = false; # requires network access