deleted file mode 100644
--- a/lib/unistr/ucs4-utf16.c
+++ /dev/null
@@ -1,60 +0,0 @@
-/* Conversion UCS-4 to UTF-16.
-   Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc.
-   Written by Bruno Haible <bruno@clisp.org>, 2002.
-
-   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.  */
-
-#include <config.h>
-
-/* Specification.  */
-#include "unistr.h"
-
-int
-u16_uctomb_aux (uint16_t *s, ucs4_t uc, int n)
-{
-  if (uc < 0xd800)
-    {
-      /* The case n >= 1 is already handled by the caller.  */
-    }
-  else if (uc < 0x10000)
-    {
-      if (uc >= 0xe000)
-	{
-	  if (n >= 1)
-	    {
-	      s[0] = uc;
-	      return 1;
-	    }
-	}
-      else
-	return -1;
-    }
-  else
-    {
-      if (uc < 0x110000)
-	{
-	  if (n >= 2)
-	    {
-	      s[0] = 0xd800 + ((uc - 0x10000) >> 10);
-	      s[1] = 0xdc00 + ((uc - 0x10000) & 0x3ff);
-	      return 2;
-	    }
-	}
-      else
-	return -1;
-    }
-  return -2;
-}