From 321754aaab31d549efcff43789da6f2ddfa3750a Mon Sep 17 00:00:00 2001
From: Daniel McCarney <daniel@binaryparadox.net>
Date: Thu, 20 Mar 2025 11:09:41 -0400
Subject: [PATCH] ldmud: apply patch for libxml2 2.12+ compat

A fix is underway upstream, but the release cadence is such that we
should expect to fix this locally for some time.
---
 pkgs/games/ldmud/default.nix                 |  2 ++
 pkgs/games/ldmud/libxml2-2.12.0-compat.patch | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 pkgs/games/ldmud/libxml2-2.12.0-compat.patch

diff --git a/pkgs/games/ldmud/default.nix b/pkgs/games/ldmud/default.nix
index 7d6092752066..a1c66918a690 100644
--- a/pkgs/games/ldmud/default.nix
+++ b/pkgs/games/ldmud/default.nix
@@ -37,6 +37,8 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-PkrjP7tSZMaj61Hsn++7+CumhqFPLbf0+eAI6afP9HA=";
   };
 
+  patches = [ ./libxml2-2.12.0-compat.patch ];
+
   sourceRoot = "${src.name}/src";
 
   nativeBuildInputs =
diff --git a/pkgs/games/ldmud/libxml2-2.12.0-compat.patch b/pkgs/games/ldmud/libxml2-2.12.0-compat.patch
new file mode 100644
index 000000000000..372bdc8cafbd
--- /dev/null
+++ b/pkgs/games/ldmud/libxml2-2.12.0-compat.patch
@@ -0,0 +1,18 @@
+diff --git src/pkg-xml2.c src/pkg-xml2.c
+index 048ca38c..9ea4de35 100644
+--- src/pkg-xml2.c
++++ src/pkg-xml2.c
+@@ -507,8 +507,13 @@ f_xml_generate (svalue_t *sp)
+     return sp;
+ }
+ 
++#if LIBXML_VERSION >= 21200
++static void
++xml_pkg_error_handler(void * userData, const xmlError *error)
++#else
+ static void
+ xml_pkg_error_handler(void * userData, xmlErrorPtr error)
++#endif
+ {
+     if (error)
+     {