From 35114c9e629c53546c8e95edd6def7b3e1692c7a Mon Sep 17 00:00:00 2001
From: Michael Marshall <43034299+mmphys@users.noreply.github.com>
Date: Wed, 17 Feb 2021 13:24:15 +0000
Subject: [PATCH] Mac OS (Darwin) sed -i flag for in-place editing differs from
 posix / gnu

---
 configure.ac | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 7d95e4e2..702ce826 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,12 @@ AM_INIT_AUTOMAKE([subdir-objects 1.13])
 AM_EXTRA_RECURSIVE_TARGETS([tests bench])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([Grid/Grid.h])
-AC_CONFIG_HEADERS([Grid/Config.h],[[sed -i '' -e 's|PACKAGE_|GRID_|' -e 's|[[:space:]]PACKAGE[[:space:]]| GRID_PACKAGE |' -e 's|[[:space:]]VERSION[[:space:]]| GRID_PACKAGE_VERSION |' Grid/Config.h]])
+AC_CONFIG_HEADERS([Grid/Config.h],[[$SED_INPLACE -e 's|PACKAGE_|GRID_|' -e 's|[[:space:]]PACKAGE[[:space:]]| GRID_PACKAGE |' -e 's|[[:space:]]VERSION[[:space:]]| GRID_PACKAGE_VERSION |' Grid/Config.h]],
+    [if test x"$host_os" == x"${host_os#darwin}" ; then]
+        [SED_INPLACE="sed -i"]
+    [else]
+        [SED_INPLACE="sed -i .bak"]
+    [fi])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
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