commit eaf69d98755cbd51ea6243d01cef68de16831afd
Author: Andy Isaacson <adi@cloudera.com>
Date:   Thu Jun 28 12:35:26 2012 -0700

    MAPREDUCE-4383 fix HadoopPipes compilation on gcc 4.7

--- a/src/c++/pipes/impl/HadoopPipes.cc
+++ b/src/c++/pipes/impl/HadoopPipes.cc
@@ -30,6 +30,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <strings.h>
+#include <unistd.h>
 #include <sys/socket.h>
 #include <pthread.h>
 #include <iostream>