From 82d77e7ae1e968edf7a67d8c9ceb6b5cf7d2b94c Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Fri, 28 Oct 2022 21:14:01 -0400
Subject: [PATCH] update example

---
 examples/COUPLE/plugin/simple.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/examples/COUPLE/plugin/simple.c b/examples/COUPLE/plugin/simple.c
index 609aeb1dfc..1401a22f49 100644
--- a/examples/COUPLE/plugin/simple.c
+++ b/examples/COUPLE/plugin/simple.c
@@ -19,10 +19,16 @@
            in.lammps = LAMMPS input script
    See README for compilation instructions */
 
+#include <mpi.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <mpi.h>
+
+/* define so interface to lammps_open() is available,
+   since we will run on split communicator */
+#define LAMMPS_LIB_MPI 1
+
 #include "liblammpsplugin.h"  /* this is the include for the plugin loader */
 
 int main(int narg, char **arg)