From c8432fe18f73035ba6d68624d9e6a70ffb1075cd Mon Sep 17 00:00:00 2001
From: Felix Ruess <felix.ruess@gmail.com>
Date: Sun, 17 Aug 2014 23:40:43 +0200
Subject: [PATCH] [build] only set PAPARAZZI_SRC if not already externally set

closes #800
---
 Makefile    | 2 +-
 Makefile.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 89e04fb0c0..e96f1fb4cd 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,7 @@ ifeq ($(Q),@)
 MAKEFLAGS += --no-print-directory
 endif
 
-PAPARAZZI_SRC=$(shell pwd)
+PAPARAZZI_SRC ?= $(shell pwd)
 empty=
 space=$(empty) $(empty)
 ifneq ($(findstring $(space),$(PAPARAZZI_SRC)),)
diff --git a/Makefile.ac b/Makefile.ac
index 55a30eef1b..d85e2bbd68 100644
--- a/Makefile.ac
+++ b/Makefile.ac
@@ -21,7 +21,7 @@
 
 # Preprocessing of XML configuration files
 
-PAPARAZZI_SRC=$(shell pwd)
+PAPARAZZI_SRC ?= $(shell pwd)
 
 include conf/Makefile.local