From 4788c7d2a9e98520615e5e0ee6a996dfe86a304e Mon Sep 17 00:00:00 2001
From: Ilya Kulakov <kulakov.ilya@gmail.com>
Date: Thu, 21 Jan 2016 13:45:42 +0600
Subject: [PATCH] Backport zeromq/libzmq#1722

---
 src/socket_base.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/socket_base.cpp b/src/socket_base.cpp
index d6d5d4e3..ec018360 100644
--- a/src/socket_base.cpp
+++ b/src/socket_base.cpp
@@ -44,6 +44,7 @@
 #endif
 #else
 #include <unistd.h>
+#include <ctype.h>
 #endif
 
 #include "socket_base.hpp"