From 433869625a90cf1743361e48b5f62ac52cee6dd2 Mon Sep 17 00:00:00 2001
From: Doron Behar <doron.behar@gmail.com>
Date: Wed, 15 Jul 2026 12:19:41 +0300
Subject: [PATCH] lammps: remove deprecated MPIIO package not related to mpi

This lammps package was removed in this upstream commit:

https://github.com/lammps/lammps/commit/d230ae49c48a15ccefa6b3dcb091ecf508be4c52

MPI support is actually controlled by `BUILD_MPI` flag, documented in
<https://docs.lammps.org/Build_basics.html>. The next commit fixes that
for `lammps-mpi/package.nix`.
---
 pkgs/by-name/la/lammps/package.nix | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/pkgs/by-name/la/lammps/package.nix b/pkgs/by-name/la/lammps/package.nix
index d25664c8f85e..df446f759588 100644
--- a/pkgs/by-name/la/lammps/package.nix
+++ b/pkgs/by-name/la/lammps/package.nix
@@ -40,7 +40,6 @@
     SRD = true;
     REAXFF = true;
     PYTHON = true;
-    MPIIO = true;
   },
   # Extra cmakeFlags to add as "-D${attr}=${value}"
   extraCmakeFlags ? { },
@@ -75,9 +74,6 @@ stdenv.mkDerivation (finalAttrs: {
   ]
   ++ lib.optionals packages.PYTHON [
     python3
-  ]
-  ++ lib.optionals packages.MPIIO [
-    mpich
   ];
 
   passthru = {