--- a/src/contrib/zktreeutil/src/ZkAdaptor.h	2012-09-30 19:53:32.000000000 +0200
+++ b/src/contrib/zktreeutil/src/ZkAdaptor.h	2013-04-04 03:37:46.731950855 +0200
@@ -21,6 +21,7 @@
 
 #include <string>
 #include <vector>
+#include <unistd.h>
 
 extern "C" {
 #include "zookeeper.h"