From: Simon Ruderich <simon@ruderich.org>
Date: Wed, 19 Oct 2016 18:20:02 +0200
Subject: Use CFLAGS from environment

---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 94247f5..cb7cbc1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -100,7 +100,7 @@ else
 fi
 
 dnl Make sure we fail on all warnings
-CFLAGS=-Wall
+CFLAGS="$CFLAGS -Wall"
 
 AC_CONFIG_FILES([
 Makefile