From 3f13e1af0d1874a258b7ec09f7f862e687058719 Mon Sep 17 00:00:00 2001
From: Matt Huszagh <huszaghmatt@gmail.com>
Date: Sun, 20 Oct 2019 18:02:10 -0700
Subject: [PATCH] openmpi: enable C++ bindings

---
 pkgs/development/libraries/openmpi/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/openmpi/default.nix b/pkgs/development/libraries/openmpi/default.nix
index 61e3165dd3f8..d6f23a9060ff 100644
--- a/pkgs/development/libraries/openmpi/default.nix
+++ b/pkgs/development/libraries/openmpi/default.nix
@@ -13,7 +13,6 @@
 
 # Enable libfabric support (necessary for Omnipath networks) on x86_64 linux
 , fabricSupport ? stdenv.isLinux && stdenv.isx86_64
-
 }:
 
 assert !cudaSupport || cudatoolkit != null;
@@ -59,6 +58,7 @@ in stdenv.mkDerivation rec {
       "--with-libnl=${libnl.dev}"
       "--with-pmix=${pmix}"
       "--with-pmix-libdir=${pmix}/lib"
+      "--enable-mpi-cxx"
     ] ++ lib.optional enableSGE "--with-sge"
     ++ lib.optional enablePrefix "--enable-mpirun-prefix-by-default"
     # TODO: add UCX support, which is recommended to use with cuda for the most robust OpenMPI build