From 7ba4a1832e439608b531c6694518f78813a835a3 Mon Sep 17 00:00:00 2001
From: Vincent Bernat <bernat@luffy.cx>
Date: Wed, 8 May 2013 10:27:18 +0200
Subject: [PATCH] configure: use `AC_PROG_EGREP` to find a suitable `grep -E`

On some systems, this is `ggrep -E`.
---
 Makefile.am  | 2 +-
 configure.ac | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index abc3c742..23c55f37 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -14,7 +14,7 @@ __force-changelog-generation:
 ChangeLog: __force-changelog-generation
 	$(AM_V_GEN)if test -d $(top_srcdir)/.git; then \
 		prev=$$(git describe --tags --always --match '[0-9]*' 2> /dev/null) ; \
-		for tag in $$(git tag | grep -E '^[0-9]+(\.[0-9]+){1,}$$' | sort -rn); do \
+		for tag in $$(git tag | $(EGREP) '^[0-9]+(\.[0-9]+){1,}$$' | sort -rn); do \
 			if [ x"$$prev" = x ]; then prev=$$tag ; fi ; \
 			if [ x"$$prev" = x"$$tag" ]; then continue; fi ; \
 			echo "$$prev [$$(git log $$prev -1 --pretty=format:'%ai')]:" ; \
diff --git a/configure.ac b/configure.ac
index 708c2ed3..570031bc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,6 +43,7 @@ AC_PROG_CXX
 AM_PROG_CC_C_O
 AC_PROG_LIBTOOL
 AC_PROG_LN_S
+AC_PROG_EGREP
 
 # Doxygen
 DX_HTML_FEATURE(ON)
-- 
2.47.2