From ace298679e97feb2f0058b0bce7451715808a065 Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Wed, 1 Jan 2025 23:36:22 +0900
Subject: [PATCH] Turn off a new GCC warning that forbids build of older
 Emacsens

---
 emacs.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/emacs.nix b/emacs.nix
index d4d3e12..d5e5d11 100644
--- a/emacs.nix
+++ b/emacs.nix
@@ -101,6 +101,12 @@ stdenv.mkDerivation rec {
     ''
   ];
 
+  env = lib.optionalAttrs (stdenv.cc.isGNU && lib.versionOlder version "24.3") {
+    NIX_CFLAGS_COMPILE = toString [
+      "-Wno-error=implicit-function-declaration"
+    ];
+  };
+
   installTargets = "tags install";
 
   # Create site-start.el which is needed by the wrapper