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diff --git a/lib/iconv.in.h b/lib/iconv.in.h
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+/* A GNU-like <iconv.h>.
+
+ Copyright (C) 2007-2023 Free Software Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file 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 Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#ifndef _@GUARD_PREFIX@_ICONV_H
+
+#if __GNUC__ >= 3
+@PRAGMA_SYSTEM_HEADER@
+#endif
+@PRAGMA_COLUMNS@
+
+/* The include_next requires a split double-inclusion guard. */
+#@INCLUDE_NEXT@ @NEXT_ICONV_H@
+
+#ifndef _@GUARD_PREFIX@_ICONV_H
+#define _@GUARD_PREFIX@_ICONV_H
+
+/* This file uses GNULIB_POSIXCHECK, HAVE_RAW_DECL_*. */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
+/* The definitions of _GL_FUNCDECL_RPL etc. are copied here. */
+
+/* The definition of _GL_ARG_NONNULL is copied here. */
+
+/* The definition of _GL_WARN_ON_USE is copied here. */
+
+
+#if @GNULIB_ICONV@
+# if @REPLACE_ICONV_OPEN@
+/* An iconv_open wrapper that supports the IANA standardized encoding names
+ ("ISO-8859-1" etc.) as far as possible. */
+# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+# define iconv_open rpl_iconv_open
+# endif
+_GL_FUNCDECL_RPL (iconv_open, iconv_t,
+ (const char *tocode, const char *fromcode)
+ _GL_ARG_NONNULL ((1, 2)));
+_GL_CXXALIAS_RPL (iconv_open, iconv_t,
+ (const char *tocode, const char *fromcode));
+# else
+_GL_CXXALIAS_SYS (iconv_open, iconv_t,
+ (const char *tocode, const char *fromcode));
+# endif
+_GL_CXXALIASWARN (iconv_open);
+#elif defined GNULIB_POSIXCHECK
+# undef iconv_open
+# if HAVE_RAW_DECL_ICONV_OPEN
+_GL_WARN_ON_USE (iconv_open, "iconv_open is not working correctly everywhere - "
+ "use gnulib module iconv for portability");
+# endif
+#endif
+
+#if @REPLACE_ICONV_UTF@
+/* Special constants for supporting UTF-{16,32}{BE,LE} encodings.
+ Not public. */
+# define _ICONV_UTF8_UTF16BE (iconv_t)(-161)
+# define _ICONV_UTF8_UTF16LE (iconv_t)(-162)
+# define _ICONV_UTF8_UTF32BE (iconv_t)(-163)
+# define _ICONV_UTF8_UTF32LE (iconv_t)(-164)
+# define _ICONV_UTF16BE_UTF8 (iconv_t)(-165)
+# define _ICONV_UTF16LE_UTF8 (iconv_t)(-166)
+# define _ICONV_UTF32BE_UTF8 (iconv_t)(-167)
+# define _ICONV_UTF32LE_UTF8 (iconv_t)(-168)
+#endif
+
+#if @GNULIB_ICONV@
+# if @REPLACE_ICONV@
+# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+# define iconv rpl_iconv
+# endif
+_GL_FUNCDECL_RPL (iconv, size_t,
+ (iconv_t cd,
+ @ICONV_CONST@ char **restrict inbuf,
+ size_t *restrict inbytesleft,
+ char **restrict outbuf, size_t *restrict outbytesleft));
+_GL_CXXALIAS_RPL (iconv, size_t,
+ (iconv_t cd,
+ @ICONV_CONST@ char **restrict inbuf,
+ size_t *restrict inbytesleft,
+ char **restrict outbuf, size_t *restrict outbytesleft));
+# else
+/* Need to cast, because on some versions of Solaris, ICONV_CONST does
+ not have the right value for C++. */
+_GL_CXXALIAS_SYS_CAST (iconv, size_t,
+ (iconv_t cd,
+ @ICONV_CONST@ char **restrict inbuf,
+ size_t *restrict inbytesleft,
+ char **restrict outbuf, size_t *restrict outbytesleft));
+# endif
+_GL_CXXALIASWARN (iconv);
+# ifndef ICONV_CONST
+# define ICONV_CONST @ICONV_CONST@
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef iconv
+# if HAVE_RAW_DECL_ICONV
+_GL_WARN_ON_USE (iconv, "iconv is not working correctly everywhere - "
+ "use gnulib module iconv for portability");
+# endif
+#endif
+
+#if @GNULIB_ICONV@
+# if @REPLACE_ICONV@
+# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+# define iconv_close rpl_iconv_close
+# endif
+_GL_FUNCDECL_RPL (iconv_close, int, (iconv_t cd));
+_GL_CXXALIAS_RPL (iconv_close, int, (iconv_t cd));
+# else
+_GL_CXXALIAS_SYS (iconv_close, int, (iconv_t cd));
+# endif
+_GL_CXXALIASWARN (iconv_close);
+#endif
+
+
+#endif /* _@GUARD_PREFIX@_ICONV_H */
+#endif /* _@GUARD_PREFIX@_ICONV_H */