From 8224fea3dbe4fddbcb14c1174ee03cc575a043c2 Mon Sep 17 00:00:00 2001
From: Doron Behar <doron.behar@gmail.com>
Date: Thu, 20 Feb 2025 15:06:45 +0200
Subject: [PATCH] python312Packages.h5py: use environment to spare mpi4py
 setup.py substitutions

---
 pkgs/development/python-modules/h5py/default.nix | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/pkgs/development/python-modules/h5py/default.nix b/pkgs/development/python-modules/h5py/default.nix
index 192fe6d7158b..26b2a38984ed 100644
--- a/pkgs/development/python-modules/h5py/default.nix
+++ b/pkgs/development/python-modules/h5py/default.nix
@@ -35,20 +35,19 @@ buildPythonPackage rec {
 
   pythonRelaxDeps = [ "mpi4py" ];
 
-  # avoid strict pinning of numpy and mpi4py, can't be replaced with
-  # pythonRelaxDepsHook, see: https://github.com/NixOS/nixpkgs/issues/327941
+  # Avoid strict pinning of Numpy, can't be replaced with pythonRelaxDepsHook,
+  # as these are build time dependencies. See:
+  # https://github.com/NixOS/nixpkgs/issues/327941
   postPatch = ''
     substituteInPlace pyproject.toml \
       --replace-fail "numpy >=2.0.0, <3" "numpy"
-    substituteInPlace setup.py \
-      --replace-fail "mpi4py ==3.1.4" "mpi4py" \
-      --replace-fail "mpi4py ==4.0.1" "mpi4py" \
-      --replace-fail "mpi4py ==3.1.6" "mpi4py"
   '';
 
   env = {
     HDF5_DIR = "${hdf5}";
     HDF5_MPI = if mpiSupport then "ON" else "OFF";
+    # See discussion at https://github.com/h5py/h5py/issues/2560
+    H5PY_SETUP_REQUIRES = 0;
   };
 
   postConfigure = ''