File 24.patch of Package libb2

From 9b9a3a452ed7fe4599405936442b56000547ea0c Mon Sep 17 00:00:00 2001
From: Gianfranco Costamagna <costamagnagianfranco@yahoo.it>
Date: Thu, 14 Mar 2019 16:11:43 +0100
Subject: [PATCH] Update configure.ac, do not override CFLAGS from the system

By default, AX_CHECK_COMPILE_FLAG overrides the *FLAG, so lets stop doing that.
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index c441da9..9cf20bc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,7 +60,7 @@ AC_HELP_STRING([--enable-native],
                [enable_native=yes]
 )
 
-AX_CHECK_COMPILE_FLAG([-O3], [CFLAGS=-O3])
+AX_CHECK_COMPILE_FLAG([-O3], [CFLAGS="$CFLAGS -O3"])
 dnl Not all architectures support -march=native
 if test $enable_native == "yes"; then
   AX_CHECK_COMPILE_FLAG([-march=native], [], [enable_native=no])