From b7bd5b9794223f12203142159a22b176da2378e8 Mon Sep 17 00:00:00 2001
From: Timo Rothenpieler <timo@rothenpieler.org>
Date: Fri, 30 Sep 2016 12:17:16 +0200
Subject: [PATCH] configure: define posix source on cygwin

Some function definitions are missing without it,
for example sigaction.

Fixes ticket #5868
---
 configure | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure b/configure
index df6ffa2d18..2b141fbf92 100755
--- a/configure
+++ b/configure
@@ -4802,6 +4802,7 @@ case $target_os in
         objformat="win32"
         enable dos_paths
         enabled shared && ! enabled small && check_cmd $windres --version && enable gnu_windres
+        add_cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
         ;;
     *-dos|freedos|opendos)
         network_extralibs="-lsocket"