From 5d33c7ef3d73ecd61a69b589e9667ff05752eb7c Mon Sep 17 00:00:00 2001
From: 7c6f434c <7c6f434c@mail.ru>
Date: Sat, 3 Jan 2026 14:03:57 +0100
Subject: [PATCH] mkcl: fix build by setting std=gnu17

---
 pkgs/development/compilers/mkcl/default.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/compilers/mkcl/default.nix b/pkgs/development/compilers/mkcl/default.nix
index 58f36ab4a180..f5466bf43c59 100644
--- a/pkgs/development/compilers/mkcl/default.nix
+++ b/pkgs/development/compilers/mkcl/default.nix
@@ -58,8 +58,12 @@ stdenv.mkDerivation rec {
     )
   '';
 
+  env = {
+    NIX_CFLAGS_COMPILE = "-std=gnu17";
+  };
+
   postInstall = ''
-    wrapProgram $out/bin/mkcl --prefix PATH : "${gcc}/bin"
+    wrapProgram $out/bin/mkcl --prefix PATH : "${gcc}/bin" --set-default LANG "C.UTF-8"
   '';
 
   enableParallelBuilding = true;