From 13e3a337def6f75ab37bc8b7293df396f816e020 Mon Sep 17 00:00:00 2001
From: Gon Solo <gonsolo@gmail.com>
Date: Sat, 10 Jan 2026 12:09:55 +0100
Subject: [PATCH] magic-vlsi: fix build with modern compilers

---
 pkgs/by-name/ma/magic-vlsi/package.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/by-name/ma/magic-vlsi/package.nix b/pkgs/by-name/ma/magic-vlsi/package.nix
index 284220fc2ca2..1aa95871a0b4 100644
--- a/pkgs/by-name/ma/magic-vlsi/package.nix
+++ b/pkgs/by-name/ma/magic-vlsi/package.nix
@@ -87,7 +87,8 @@ stdenv.mkDerivation rec {
     install_name_tool -add_rpath ${mesa_glu.out}/lib $out/lib/magic/tcl/magicexec
   '';
 
-  env.NIX_CFLAGS_COMPILE = "-Wno-implicit-function-declaration";
+  # gnu89 is needed for GCC 15 that is more strict about K&R style prototypes
+  env.NIX_CFLAGS_COMPILE = "-std=gnu89 -Wno-implicit-function-declaration";
   env.NIX_LDFLAGS = lib.optionalString stdenv.hostPlatform.isDarwin "-headerpad_max_install_names";
 
   meta = {