From 37ccc163ec823d73a9fba0ced7ec9d7d7f7132ef Mon Sep 17 00:00:00 2001
From: Pedro Larroy <pedro.larroy.lists@gmail.com>
Date: Mon, 6 May 2019 21:00:10 +0000
Subject: [PATCH] Fix warning (fpermissive) sleep definition not available

---
 src/operator/random/shuffle_op.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/operator/random/shuffle_op.cc b/src/operator/random/shuffle_op.cc
index 1bd70b1f323a..5b4d9c74766c 100644
--- a/src/operator/random/shuffle_op.cc
+++ b/src/operator/random/shuffle_op.cc
@@ -33,6 +33,7 @@
 #include <vector>
 #include <cstring>
 #ifdef USE_GNU_PARALLEL_SHUFFLE
+  #include <unistd.h>
   #include <parallel/algorithm>
 #endif
 #include "../elemwise_op_common.h"