--- include/stxxl/bits/mng/config.h.orig	2011-03-08 18:03:38.000000000 +0300
+++ include/stxxl/bits/mng/config.h	2013-09-24 00:15:43.592520759 +0400
@@ -21,6 +21,8 @@
 #include <stxxl/bits/singleton.h>
 #include <stxxl/bits/verbose.h>
 
+#include <unistd.h>
+
 
 __STXXL_BEGIN_NAMESPACE