From a2bc77d0e198659e72c9addb89a993007de99fe7 Mon Sep 17 00:00:00 2001
From: Ray Donnelly <mingw.android@gmail.com>
Date: Wed, 5 Aug 2015 23:36:11 +0100
Subject: [PATCH 05/15] Windows: Don't ignore native system header dir

---
 gcc/config.gcc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index c835734..4638567 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1699,7 +1699,10 @@ i[34567]86-*-mingw* | x86_64-*-mingw*)
 			tmake_file="${tmake_file} i386/t-mingw-w32"
 			;;
 	esac
-        native_system_header_dir=/mingw/include
+	# Don't ignore values passed in to configure via --native-system-header-dir
+	if test x$native_system_header_dir = x ; then
+		native_system_header_dir=/mingw/include
+	fi
 	target_gtfiles="\$(srcdir)/config/i386/winnt.c"
 	extra_options="${extra_options} i386/cygming.opt i386/mingw.opt"
 	case ${target} in
-- 
2.8.1