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--- echo.cpp.orig 2014-08-06 10:11:40.000000000 -0400 +++ echo.cpp 2014-08-06 10:11:56.000000000 -0400 @@ -20,6 +20,7 @@ #include "echo.h" #include "exception.h" +#include <sys/types.h> #include <sys/socket.h> #include <netinet/in_systm.h> #include <netinet/in.h>