From a218085aa04e68a4834d67a45517c7918d782299 Mon Sep 17 00:00:00 2001
From: Xiangyan Sun <wishstudio@gmail.com>
Date: Mon, 4 May 2026 14:39:02 -0700
Subject: [PATCH] mlvwm: fix build with gcc15

---
 pkgs/by-name/ml/mlvwm/package.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/by-name/ml/mlvwm/package.nix b/pkgs/by-name/ml/mlvwm/package.nix
index 1705496ec0c2..9c6fd1a00fed 100644
--- a/pkgs/by-name/ml/mlvwm/package.nix
+++ b/pkgs/by-name/ml/mlvwm/package.nix
@@ -21,6 +21,12 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "sha256-ElKmi+ANuB3LPwZTMcr5HEMESjDwENbYnNIGdRP24d0=";
   };
 
+  postPatch = ''
+    # gcc15
+    substituteInPlace mlvwm/functions.h \
+      --replace-fail "void (*action)();" "void (*action)(char *);"
+  '';
+
   nativeBuildInputs = [ installShellFiles ];
 
   buildInputs = [