From 0b0c1d8437e7aa3d6d8ef7302df038fe07c5068c Mon Sep 17 00:00:00 2001
From: Matt McHenry <github@matt.mchenryfamily.org>
Date: Sat, 10 Jan 2026 13:08:50 -0500
Subject: [PATCH] email: fix compilation with gcc 15

---
 pkgs/by-name/em/email/package.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/by-name/em/email/package.nix b/pkgs/by-name/em/email/package.nix
index 2b168ad5d111..9aba58c1d25f 100644
--- a/pkgs/by-name/em/email/package.nix
+++ b/pkgs/by-name/em/email/package.nix
@@ -40,6 +40,10 @@ stdenv.mkDerivation {
     })
   ];
 
+  # opt out of GCC 15's stricter C standards
+  # https://github.com/NixOS/nixpkgs/issues/475479
+  env.NIX_CFLAGS_COMPILE = toString [ "-std=gnu17" ];
+
   buildInputs = [ openssl ];
 
   unpackPhase = ''