From 323636a6aff45a48dd7a5c284fdae6d9a8e86d36 Mon Sep 17 00:00:00 2001
From: Dmitry Bogatov <kaction.cc@gmail.com>
Date: Mon, 4 Aug 2025 14:20:41 +0000
Subject: [PATCH] krb5: Fix build with gcc=15

---
 pkgs/development/libraries/kerberos/krb5.nix | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/libraries/kerberos/krb5.nix b/pkgs/development/libraries/kerberos/krb5.nix
index 790efc6865ef..0746b818b545 100644
--- a/pkgs/development/libraries/kerberos/krb5.nix
+++ b/pkgs/development/libraries/kerberos/krb5.nix
@@ -53,8 +53,13 @@ stdenv.mkDerivation rec {
   # stdenv will take care of overriding bindir, sbindir, etc. such that "out" contains the binaries.
   prefix = builtins.placeholder "lib";
 
-  env = lib.optionalAttrs stdenv.hostPlatform.isStatic {
-    NIX_CFLAGS_COMPILE = "-fcommon";
+  env = {
+    # The release 1.21.3 is not compatible with c23, which changed the meaning of
+    #
+    #     void foo();
+    #
+    # declaration.
+    NIX_CFLAGS_COMPILE = "-std=gnu17" + lib.optionalString stdenv.hostPlatform.isStatic " -fcommon";
   };
 
   configureFlags = [