# include <sys/socket.h>\r
# endif\r
# include <netinet/in.h>\r
-# if !(defined(UEFI_ENV) || defined(__BEOS__) || defined(__CYGWIN__) || (defined(PYOS_OS2) && defined(PYCC_VACPP)))\r
+# if !(defined(UEFI_C_SOURCE) || defined(__BEOS__) || defined(__CYGWIN__) || (defined(PYOS_OS2) && defined(PYCC_VACPP)))\r
# include <netinet/tcp.h>\r
# endif\r
\r