From 3330fd35d04f892515b6e46ae69984b5e8e4b5bb Mon Sep 17 00:00:00 2001
From: Doron Behar <doron.behar@gmail.com>
Date: Mon, 6 Apr 2026 19:28:39 +0300
Subject: [PATCH] openmpi: explain why pmix is not found with pkg-config

---
 pkgs/by-name/op/openmpi/package.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/by-name/op/openmpi/package.nix b/pkgs/by-name/op/openmpi/package.nix
index 67a0d62ef13b..287fc4667dad 100644
--- a/pkgs/by-name/op/openmpi/package.nix
+++ b/pkgs/by-name/op/openmpi/package.nix
@@ -114,6 +114,8 @@ stdenv.mkDerivation (finalAttrs: {
     (lib.enableFeature cudaSupport "mca-dso")
     (lib.enableFeature fortranSupport "mpi-fortran")
     (lib.withFeatureAs stdenv.hostPlatform.isLinux "libnl" (lib.getDev libnl))
+    # From some reason, without this the darwin build fails with cyclic
+    # references between $dev and $out
     "--with-pmix=${lib.getDev pmix}"
     "--with-pmix-libdir=${lib.getLib pmix}/lib"
     # Puts a "default OMPI_PRTERUN" value to mpirun / mpiexec executables