From e4e98bb0743eb03720f77068cc2949d83c3121ab Mon Sep 17 00:00:00 2001
From: Dmitry Bogatov <kaction.cc@gmail.com>
Date: Tue, 5 Aug 2025 19:38:06 +0000
Subject: [PATCH] cpio: Fix build with gcc=15

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

diff --git a/pkgs/by-name/cp/cpio/package.nix b/pkgs/by-name/cp/cpio/package.nix
index 879b52a98c7d..d2b2ed66fa1d 100644
--- a/pkgs/by-name/cp/cpio/package.nix
+++ b/pkgs/by-name/cp/cpio/package.nix
@@ -24,6 +24,12 @@ stdenv.mkDerivation rec {
 
   separateDebugInfo = true;
 
+  # The code won't compile in c23 mode.
+  # https://gcc.gnu.org/gcc-15/porting_to.html#c23-fn-decls-without-parameters
+  configureFlags = [
+    "CFLAGS=-std=gnu17"
+  ];
+
   preConfigure = lib.optionalString stdenv.hostPlatform.isCygwin ''
     sed -i gnu/fpending.h -e 's,include <stdio_ext.h>,,'
   '';