From 6ff9d5e881383ca2abcf51fa3aafc53c21021f11 Mon Sep 17 00:00:00 2001
From: Li-Wen Hsu <lwhsu@lwhsu.org>
Date: Wed, 16 Jan 2019 04:55:43 +0800
Subject: [PATCH] Include unistd.h on unix platforms for explicit function
 declaration

---
 zlibWrapper/gzguts.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/zlibWrapper/gzguts.h b/zlibWrapper/gzguts.h
index 05bf4d9f..b639b4be 100644
--- a/zlibWrapper/gzguts.h
+++ b/zlibWrapper/gzguts.h
@@ -38,6 +38,8 @@
 
 #ifdef _WIN32
 #  include <stddef.h>
+#else
+#  include <unistd.h>
 #endif
 
 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)