From 87d879aa7b3a75245e5e1a0fe15ba08105457df2 Mon Sep 17 00:00:00 2001
From: Matteo Cypriani <mcy@lm7.fr>
Date: Sun, 7 Sep 2014 11:57:09 -0400
Subject: [PATCH] Accept CPPFLAGS from the environment

Don't override CPPFLAGS so that it can be passed through the
environment.

(This is a patch Thomas Preud'homme wrote for Debian in February 2013.)
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 4f185670..7796883c 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ TOP ?= .
 include $(TOP)/config.mak
 VPATH = $(top_srcdir)
 
-CPPFLAGS = -I$(TOP) # for config.h
+CPPFLAGS += -I$(TOP) # for config.h
 
 ifeq (-$(findstring gcc,$(CC))-,-gcc-)
 ifeq (-$(findstring $(GCC_MAJOR),01)-,--)