diff --git a/include/ncurses_dll.h b/include/ncurses_dll.h
new file mode 100644
index 0000000..2a6055f
--- /dev/null
+++ b/include/ncurses_dll.h
@@ -0,0 +1,103 @@
+/****************************************************************************
+ * Copyright 2018-2020,2023 Thomas E. Dickey                                *
+ * Copyright 2009,2014 Free Software Foundation, Inc.                       *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+/* $Id: ncurses_dll.h.in,v 1.18 2023/05/06 20:12:43 tom Exp $ */
+
+#ifndef NCURSES_DLL_H_incl
+#define NCURSES_DLL_H_incl 1
+
+/*
+ * MinGW gcc (unlike MSYS2 and Cygwin) should define _WIN32 and possibly _WIN64.
+ */
+#if defined(__MINGW64__)
+
+#ifndef _WIN64
+#define _WIN64 1
+#endif
+
+#elif defined(__MINGW32__)
+
+#ifndef _WIN32
+#define _WIN32 1
+#endif
+
+/* 2014-08-02 workaround for broken MinGW compiler.
+ * Oddly, only TRACE is mapped to trace - the other -D's are okay.
+ * suggest TDM as an alternative.
+ */
+#if (__GNUC__ == 4) && (__GNUC_MINOR__ == 8)
+
+#ifdef trace
+#undef trace
+#define TRACE
+#endif
+
+#endif	/* broken compiler */
+
+#endif	/* MingW */
+
+/*
+ * For reentrant code, we map the various global variables into SCREEN by
+ * using functions to access them.
+ */
+#define NCURSES_PUBLIC_VAR(name) _nc_##name
+
+#if defined(BUILDING_NCURSES)
+# define NCURSES_IMPEXP NCURSES_EXPORT_GENERAL_EXPORT
+#else
+# define NCURSES_IMPEXP NCURSES_EXPORT_GENERAL_IMPORT
+#endif
+
+#define NCURSES_WRAPPED_VAR(type,name) extern NCURSES_IMPEXP type NCURSES_PUBLIC_VAR(name)(void)
+
+#define NCURSES_EXPORT(type) NCURSES_IMPEXP type NCURSES_API
+#define NCURSES_EXPORT_VAR(type) NCURSES_IMPEXP type
+
+/*
+ * These symbols hide dllimport/dllexport, for compilers which care about it.
+ */
+#if defined(__CYGWIN__) || (defined(_WIN32) || defined(_WIN64))
+# if defined(NCURSES_STATIC)	/* "static" here only implies "not-a-DLL" */
+#   define NCURSES_EXPORT_GENERAL_IMPORT
+#   define NCURSES_EXPORT_GENERAL_EXPORT
+# else
+#   define NCURSES_EXPORT_GENERAL_IMPORT __declspec(dllimport)
+#   define NCURSES_EXPORT_GENERAL_EXPORT __declspec(dllexport)
+# endif
+# define NCURSES_API __cdecl
+#else
+# define NCURSES_EXPORT_GENERAL_IMPORT
+# if (__GNUC__ >= 4) && !defined(__cplusplus)
+#   define NCURSES_EXPORT_GENERAL_EXPORT __attribute__((visibility ("default")))
+# else
+#   define NCURSES_EXPORT_GENERAL_EXPORT
+# endif
+# define NCURSES_API /* FIXME: __attribute__ ((cdecl)) is only available on x86 */
+#endif
+
+#endif /* NCURSES_DLL_H_incl */