From f70dd65bb2974fda462b565695c18cef7769d4e0 Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Thu, 7 Jul 2016 23:37:14 +0200
Subject: [PATCH] Fix building on cygwin after 23dbcb59

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

diff --git a/configure.ac b/configure.ac
index d9be47dccc..75df6c75de 100644
--- a/configure.ac
+++ b/configure.ac
@@ -317,6 +317,7 @@ char * strerror(int n);
 #define BOOST_NO_WSTRING 1
 
 #ifdef __CYGWIN__
+#  define _DEFAULT_SOURCE
 #  define NOMINMAX
 #  define BOOST_POSIX 1
 #  define BOOST_POSIX_API 1
-- 
2.39.5