From 1cb4495080fde9e479fac0477c502505ce253b25 Mon Sep 17 00:00:00 2001
From: Markus Kowalewski <markus.kowalewski@gmail.com>
Date: Thu, 22 Jan 2026 15:47:09 +0100
Subject: [PATCH] hdf5: make build reproducible

---
 pkgs/tools/misc/hdf5/default.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/tools/misc/hdf5/default.nix b/pkgs/tools/misc/hdf5/default.nix
index 9434865d8e2c..6c7b426fa8f0 100644
--- a/pkgs/tools/misc/hdf5/default.nix
+++ b/pkgs/tools/misc/hdf5/default.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   cmake,
   removeReferencesTo,
   cppSupport ? true,
@@ -46,6 +47,14 @@ stdenv.mkDerivation rec {
     hash = "sha256-mJTax+VWAL3Amkq3Ij8fxazY2nfpMOTxYMUQlTvY/rg=";
   };
 
+  patches = [
+    (fetchpatch {
+      name = "reproducible-build.patch";
+      url = "https://gitlab.archlinux.org/archlinux/packaging/packages/hdf5/-/raw/main/hdf5-make-reproducible.patch";
+      hash = "sha256-Z31dCsLjYpqjoGXooOXI81EPjPwyTK8890xCENTh8aM=";
+    })
+  ];
+
   passthru = {
     inherit
       cppSupport