--- file_not_specified_in_diff	
+++ file_not_specified_in_diff	
@@ -, +, @@ 
--- simulation/metaserver.cpp
+++ simulation/metaserver.cpp
@@ -16,6 +16,7 @@ 
  ***************************************************************************/
 #include <cstdio>
 #include <cstdlib>
+#include <unistd.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>