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diff --git a/lib/setup-win32.h b/lib/setup-win32.h
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+#ifndef HEADER_CURL_SETUP_WIN32_H
+#define HEADER_CURL_SETUP_WIN32_H
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+/*
+ * Include header files for windows builds before redefining anything.
+ * Use this preprocessor block only to include or exclude windows.h,
+ * winsock2.h, ws2tcpip.h or winsock.h. Any other windows thing belongs
+ * to any other further and independent block. Under Cygwin things work
+ * just as under linux (e.g. <sys/socket.h>) and the winsock headers should
+ * never be included when __CYGWIN__ is defined. configure script takes
+ * care of this, not defining HAVE_WINDOWS_H, HAVE_WINSOCK_H, HAVE_WINSOCK2_H,
+ * neither HAVE_WS2TCPIP_H when __CYGWIN__ is defined.
+ */
+
+#ifdef HAVE_WINDOWS_H
+# if defined(UNICODE) && !defined(_UNICODE)
+# define _UNICODE
+# endif
+# if defined(_UNICODE) && !defined(UNICODE)
+# define UNICODE
+# endif
+# include <winerror.h>
+# include <windows.h>
+# ifdef HAVE_WINSOCK2_H
+# include <winsock2.h>
+# ifdef HAVE_WS2TCPIP_H
+# include <ws2tcpip.h>
+# endif
+# else
+# ifdef HAVE_WINSOCK_H
+# include <winsock.h>
+# endif
+# endif
+# include <tchar.h>
+# ifdef UNICODE
+ typedef wchar_t *(*curl_wcsdup_callback)(const wchar_t *str);
+# endif
+#endif
+
+/*
+ * Define USE_WINSOCK to 2 if we have and use WINSOCK2 API, else
+ * define USE_WINSOCK to 1 if we have and use WINSOCK API, else
+ * undefine USE_WINSOCK.
+ */
+
+#undef USE_WINSOCK
+
+#ifdef HAVE_WINSOCK2_H
+# define USE_WINSOCK 2
+#else
+# ifdef HAVE_WINSOCK_H
+# define USE_WINSOCK 1
+# endif
+#endif
+
+/*
+ * Define _WIN32_WINNT_[OS] symbols because not all Windows build systems have
+ * those symbols to compare against, and even those that do may be missing
+ * newer symbols.
+ */
+
+#ifndef _WIN32_WINNT_NT4
+#define _WIN32_WINNT_NT4 0x0400 /* Windows NT 4.0 */
+#endif
+#ifndef _WIN32_WINNT_WIN2K
+#define _WIN32_WINNT_WIN2K 0x0500 /* Windows 2000 */
+#endif
+#ifndef _WIN32_WINNT_WINXP
+#define _WIN32_WINNT_WINXP 0x0501 /* Windows XP */
+#endif
+#ifndef _WIN32_WINNT_WS03
+#define _WIN32_WINNT_WS03 0x0502 /* Windows Server 2003 */
+#endif
+#ifndef _WIN32_WINNT_WIN6
+#define _WIN32_WINNT_WIN6 0x0600 /* Windows Vista */
+#endif
+#ifndef _WIN32_WINNT_VISTA
+#define _WIN32_WINNT_VISTA 0x0600 /* Windows Vista */
+#endif
+#ifndef _WIN32_WINNT_WS08
+#define _WIN32_WINNT_WS08 0x0600 /* Windows Server 2008 */
+#endif
+#ifndef _WIN32_WINNT_LONGHORN
+#define _WIN32_WINNT_LONGHORN 0x0600 /* Windows Vista */
+#endif
+#ifndef _WIN32_WINNT_WIN7
+#define _WIN32_WINNT_WIN7 0x0601 /* Windows 7 */
+#endif
+#ifndef _WIN32_WINNT_WIN8
+#define _WIN32_WINNT_WIN8 0x0602 /* Windows 8 */
+#endif
+#ifndef _WIN32_WINNT_WINBLUE
+#define _WIN32_WINNT_WINBLUE 0x0603 /* Windows 8.1 */
+#endif
+#ifndef _WIN32_WINNT_WINTHRESHOLD
+#define _WIN32_WINNT_WINTHRESHOLD 0x0A00 /* Windows 10 */
+#endif
+#ifndef _WIN32_WINNT_WIN10
+#define _WIN32_WINNT_WIN10 0x0A00 /* Windows 10 */
+#endif
+
+#endif /* HEADER_CURL_SETUP_WIN32_H */