From 138fb379c62cc34788e1aa3d578ad1077869e9ee Mon Sep 17 00:00:00 2001
From: Bruno Rodrigues <bruno@brodrigues.co>
Date: Wed, 29 Apr 2026 09:03:07 +0200
Subject: [PATCH] udunits: fix build

Add CFLAGS to configureFlags for udunits
See: https://github.com/NixOS/nixpkgs/issues/511329
---
 pkgs/by-name/ud/udunits/package.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/by-name/ud/udunits/package.nix b/pkgs/by-name/ud/udunits/package.nix
index 1356976271fc..d87e75af72dc 100644
--- a/pkgs/by-name/ud/udunits/package.nix
+++ b/pkgs/by-name/ud/udunits/package.nix
@@ -32,6 +32,10 @@ stdenv.mkDerivation {
     expat
   ];
 
+  configureFlags = [
+    "CFLAGS=-std=gnu17"
+  ];
+
   meta = {
     homepage = "https://www.unidata.ucar.edu/software/udunits/";
     description = "C-based package for the programatic handling of units of physical quantities";