From ce24e0d3e52c545bd0d4b4f22a11ff4a9f8f0039 Mon Sep 17 00:00:00 2001
From: Martin Willi <martin@revosec.ch>
Date: Fri, 11 Oct 2013 15:26:01 +0200
Subject: [PATCH] configure.ac: Define USE_WINDOWS for Automake when building
 for Windows

---
 configure.ac | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/configure.ac b/configure.ac
index 309789ca1..8b0b8d087 100644
--- a/configure.ac
+++ b/configure.ac
@@ -724,6 +724,19 @@ if test x$printf_hooks = xauto -o x$printf_hooks = xglibc; then
 	)
 fi
 
+AC_MSG_CHECKING([for Windows target])
+AC_COMPILE_IFELSE(
+	[AC_LANG_PROGRAM(
+		[[#include <windows.h>]],
+		[[#ifndef WIN32
+		  # error WIN32 undefined
+		  #endif
+		]])],
+	[AC_MSG_RESULT([yes]); windows=true ],
+	[AC_MSG_RESULT([no])]
+)
+AM_CONDITIONAL(USE_WINDOWS, [test "x$windows" = xtrue])
+
 if test x$printf_hooks = xvstr; then
 	AC_CHECK_LIB([vstr],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([Vstr string library not found])],[])
 	AC_DEFINE([USE_VSTR], [], [use Vstr string library for printf hooks])