From 2fc6d66797b87ad40e4739520cd4e0e40d42efd3 Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Tue, 28 Jul 2015 23:32:35 -0700
Subject: [PATCH] Define _POSIX_SOURCE to enable POSIX extensions on some
 systems.

---
 gzguts.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gzguts.h b/gzguts.h
index ca13f47..593dfee 100644
--- a/gzguts.h
+++ b/gzguts.h
@@ -25,6 +25,10 @@
 #  include <stdlib.h>
 #  include <limits.h>
 #endif
+
+#ifndef _POSIX_SOURCE
+#  define _POSIX_SOURCE
+#endif
 #include <fcntl.h>
 
 #ifdef _WIN32
-- 
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