From c5d91aff481c815376776a9878ae3cd4e103ec8f Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Mon, 21 Jan 2008 17:04:40 +0000
Subject: [PATCH] Address bug #10839.

---
 configure.ac | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 531e42c7450..f7c55ee7029 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,6 +60,20 @@ AM_INIT_AUTOMAKE([1.9 tar-ustar foreign])
 AM_GNU_GETTEXT([external])
 AC_PROG_RANLIB
 
+#######################################################################
+# Require GCC 4.x
+#######################################################################
+
+set -- `g++ --version`
+GCC_VERSION=$3
+parts=`echo $GCC_VERSION | tr '.' ' '`
+set $parts
+GCC_MAJOR_VERSION=$1
+if test $GCC_MAJOR_VERSION -lt 4
+then
+	AC_MSG_ERROR([*** G++ major version $GCC_MAJOR_VERSION is too old.])
+fi
+
 #######################################################################
 # Configuration options                                               #
 #######################################################################
@@ -135,7 +149,7 @@ if test "x$optipng" = "xyes"
 then
 	AC_PATH_PROGS([OPTIPNG_BIN], [optipng], [none])
 	if test \( "x$OPTIPNG_BIN" = "xnone" \) -a \( "x$optipng" = xyes \); then
-		AC_MSG_ERROR([*** You must instsll the optipng utility before building with --optipng.])
+		AC_MSG_ERROR([*** You must install the optipng utility before building with --optipng.])
 	else
 		echo "****************************************"
 		echo "*** optipng support enabled          ***"