From a61f1c5bc285f4a1a05a25e39ab67a70cac16770 Mon Sep 17 00:00:00 2001
From: Alexey Neyman <stilor@att.net>
Date: Wed, 8 Mar 2017 17:06:46 -0800
Subject: Check for ggrep/gegrep in configure

Signed-off-by: Alexey Neyman <stilor@att.net>

diff --git a/configure.ac b/configure.ac
index d80a5cd..d10bf71 100644
--- a/configure.ac
+++ b/configure.ac
@@ -163,6 +163,10 @@ AC_PROG_INSTALL
 
 ACX_WITH_DEPRECATED([grep], [GREP])
 AC_ARG_VAR([GREP], [Specify the full path to GNU grep])
+
+# This is not a typo! Prefer GNU grep on macOS if it is installed.
+ACX_PATH_TOOL_REQ([GREP], [ggrep grep], [grep])
+ACX_PATH_TOOL_REQ([EGREP], [gegrep egrep], [egrep])
 AC_PROG_GREP
 AC_PROG_EGREP
 AS_IF([test "$EGREP" != "$GREP -E"],
-- 
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