From d35231ec6017d72492a23b882b9275a60e1737a6 Mon Sep 17 00:00:00 2001
From: David McFarland <davidm@hb-studios.com>
Date: Fri, 21 Apr 2017 11:27:27 -0300
Subject: [PATCH] set _GNU_SOURCE on cygwin

this is needed for pipe2()
---
 mk/lib.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mk/lib.mk b/mk/lib.mk
index bb82801d3..1da51d879 100644
--- a/mk/lib.mk
+++ b/mk/lib.mk
@@ -53,8 +53,8 @@ BUILD_SHARED_LIBS ?= 1
 
 ifeq ($(BUILD_SHARED_LIBS), 1)
   ifeq (CYGWIN,$(findstring CYGWIN,$(OS)))
-    GLOBAL_CFLAGS += -U__STRICT_ANSI__
-    GLOBAL_CXXFLAGS += -U__STRICT_ANSI__
+    GLOBAL_CFLAGS += -U__STRICT_ANSI__ -D_GNU_SOURCE
+    GLOBAL_CXXFLAGS += -U__STRICT_ANSI__ -D_GNU_SOURCE
   else
     GLOBAL_CFLAGS += -fPIC
     GLOBAL_CXXFLAGS += -fPIC