From 51791d4fe91cef4054922b76f9ce032f74b2479b Mon Sep 17 00:00:00 2001
From: FliegendeWurst <2012gdwu+github@posteo.de>
Date: Sun, 15 Dec 2024 15:13:28 +0100
Subject: [PATCH] libthreadar: fix build on Darwin

---
 pkgs/by-name/li/libthreadar/package.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/by-name/li/libthreadar/package.nix b/pkgs/by-name/li/libthreadar/package.nix
index 549142ad0d52..080ead869858 100644
--- a/pkgs/by-name/li/libthreadar/package.nix
+++ b/pkgs/by-name/li/libthreadar/package.nix
@@ -14,6 +14,13 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-wJAkIUGK7Ud6n2p1275vNkSx/W7LlgKWXQaDevetPko=";
   };
 
+  postPatch = ''
+    # this field is not present on Darwin, ensure it is zero everywhere
+    substituteInPlace src/thread_signal.cpp \
+      --replace-fail 'sigac.sa_restorer = nullptr;' "" \
+      --replace-fail 'struct sigaction sigac;' 'struct sigaction sigac = {0};'
+  '';
+
   outputs = [
     "out"
     "dev"