From 4527b45e865e2ff38fe5defb0137831b484e959f Mon Sep 17 00:00:00 2001
From: Randy Eckenrode <randy@largeandhighquality.com>
Date: Sat, 20 Jul 2024 01:56:40 -0400
Subject: [PATCH] gtksourceview5: fix build on x86_64-darwin

---
 pkgs/development/libraries/gtksourceview/5.x.nix | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/libraries/gtksourceview/5.x.nix b/pkgs/development/libraries/gtksourceview/5.x.nix
index d4ac1e9bb09f..f1a12eb0de12 100644
--- a/pkgs/development/libraries/gtksourceview/5.x.nix
+++ b/pkgs/development/libraries/gtksourceview/5.x.nix
@@ -40,6 +40,9 @@ stdenv.mkDerivation (finalAttrs: {
     ./4.x-nix_share_path.patch
   ];
 
+  # The 10.12 SDK used by x86_64-darwin requires defining `_POSIX_C_SOURCE` to use `strnlen`.
+  env.NIX_CFLAGS_COMPILE = lib.optionalString (stdenv.isDarwin && stdenv.isx86_64) "-D_POSIX_C_SOURCE=200809L";
+
   nativeBuildInputs = [
     meson
     ninja
@@ -113,7 +116,5 @@ stdenv.mkDerivation (finalAttrs: {
     platforms = platforms.unix;
     license = licenses.lgpl21Plus;
     maintainers = teams.gnome.members;
-    # https://hydra.nixos.org/build/258191535/nixlog/1
-    broken = stdenv.isDarwin && stdenv.isx86_64;
   };
 })