deleted file mode 100644
--- a/lib/utf16-ucs4-safe.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/* Conversion UTF-16 to UCS-4.
-   Copyright (C) 2001-2002, 2005-2007 Free Software Foundation, Inc.
-   Written by Bruno Haible <bruno@clisp.org>, 2001.
-
-   This program is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Library 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
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library 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 _UTF16_UCS4_SAFE_H
-#define _UTF16_UCS4_SAFE_H
-
-#include <stddef.h>
-#include "unitypes.h"
-
-extern int u16_mbtouc_safe_aux (ucs4_t *puc, const uint16_t *s, size_t n);
-
-/* Return the length (number of units) of the first character in S, putting
-   its 'ucs4_t' representation in *PUC.
-   The number of available units, N, must be > 0.  */
-static inline int
-u16_mbtouc_safe (ucs4_t *puc, const uint16_t *s, size_t n)
-{
-  uint16_t c = *s;
-
-  if (c < 0xd800 || c >= 0xe000)
-    {
-      *puc = c;
-      return 1;
-    }
-  else
-    return u16_mbtouc_safe_aux (puc, s, n);
-}
-
-#endif /* _UTF16_UCS4_SAFE_H */