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diff --git a/lib/socket_.h b/lib/socket_.h
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+++ b/lib/socket_.h
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+/* Provide a sys/socket header file for systems lacking it (read: MinGW).
+   Copyright (C) 2005, 2006 Free Software Foundation, Inc.
+   Written by Simon Josefsson.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef _SYS_SOCKET_H
+#define _SYS_SOCKET_H
+
+/* This file is supposed to be used on platforms that lack
+   sys/socket.h.  It is intended to provide definitions and prototypes
+   needed by an application.
+
+   Currently only MinGW is supported.  See the gnulib manual regarding
+   Windows sockets.  MinGW has the header files winsock2.h and
+   ws2tcpip.h that declare the sys/socket.h definitions we need.  Note
+   that you can influence which definitions you get by setting the
+   WINVER symbol before including these two files.  For example,
+   getaddrinfo is only available if _WIN32_WINNT >= 0x0501 (that
+   symbol is set indiriectly through WINVER).  You can set this by
+   adding AC_DEFINE(WINVER, 0x0501) to configure.ac.  Note that your
+   code may not run on older Windows releases then.  My Windows 2000
+   box was not able to run the code, for example.  The situation is
+   slightly confusing because:
+   http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winsock/winsock/getaddrinfo_2.asp
+   suggests that getaddrinfo should be available on all Windows
+   releases. */
+
+
+#if HAVE_WINSOCK2_H
+# include <winsock2.h>
+#endif
+#if HAVE_WS2TCPIP_H
+# include <ws2tcpip.h>
+#endif
+
+/* For shutdown(). */
+#if !defined SHUT_RD && defined SD_RECEIVE
+# define SHUT_RD SD_RECEIVE
+#endif
+#if !defined SHUT_WR && defined SD_SEND
+# define SHUT_WR SD_SEND
+#endif
+#if !defined SHUT_RDWR && defined SD_BOTH
+# define SHUT_RDWR SD_BOTH
+#endif
+
+#endif /* _SYS_SOCKET_H */