From fd54a9fab14fcd0969d520355e3a596f88a6a9ef Mon Sep 17 00:00:00 2001
From: Manuel Frischknecht <manuel.frischknecht@gmail.com>
Date: Sat, 16 May 2026 16:49:52 +0200
Subject: [PATCH] pigpio: fix build with modern GCC

With C23, the `pigpio` is currently broken because of various
underdefined function pointer argument lists. The upstream
code hasn't been patched to fix this yet (as of today, the
latest release is still v79 from 2021). Switching the build
to `-std=gnu17` fixes this for now.
---
 pkgs/by-name/pi/pigpio/package.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/by-name/pi/pigpio/package.nix b/pkgs/by-name/pi/pigpio/package.nix
index a106642e4931..9bd2683c82ec 100644
--- a/pkgs/by-name/pi/pigpio/package.nix
+++ b/pkgs/by-name/pi/pigpio/package.nix
@@ -26,6 +26,8 @@ mkDerivation rec {
     hash = "sha256-Z+SwUlBbtWtnbjTe0IghR3gIKS43ZziN0amYtmXy7HE=";
   };
 
+  NIX_CFLAGS_COMPILE = "-std=gnu17";
+
   nativeBuildInputs = [
     cmake
   ];