From 16eff406bcb932e25e7ac71aec808b7e47197291 Mon Sep 17 00:00:00 2001
From: 7c6f434c <7c6f434c@mail.ru>
Date: Sat, 3 Jan 2026 00:21:06 +0100
Subject: [PATCH] mlterm: force c17 on gcc to fix build with gcc15

---
 pkgs/by-name/ml/mlterm/package.nix | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/pkgs/by-name/ml/mlterm/package.nix b/pkgs/by-name/ml/mlterm/package.nix
index aad72f74a164..6bf34c6aa950 100644
--- a/pkgs/by-name/ml/mlterm/package.nix
+++ b/pkgs/by-name/ml/mlterm/package.nix
@@ -181,8 +181,12 @@ stdenv.mkDerivation (finalAttrs: {
       --replace "-m 4755 -o root" " "
   '';
 
-  env = lib.optionalAttrs stdenv.cc.isClang {
-    NIX_CFLAGS_COMPILE = "-Wno-error=int-conversion -Wno-error=incompatible-function-pointer-types";
+  env = {
+    NIX_CFLAGS_COMPILE =
+      (lib.optionalString stdenv.cc.isClang "-Wno-error=int-conversion -Wno-error=incompatible-function-pointer-types ")
+      # GCC15 defaults to C23 which is stricter about prototypes
+      # There are upstream fixes, but they are not in 3.9.4 release
+      + (lib.optionalString stdenv.cc.isGNU " -std=c17 ");
   };
 
   configureFlags = [