deleted file mode 100644
--- a/lib/unistr/ucs4-utf8.c
+++ /dev/null
@@ -1,71 +0,0 @@
-/* Conversion UCS-4 to UTF-8.
-   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
-u8_uctomb_aux (uint8_t *s, ucs4_t uc, int n)
-{
-  int count;
-
-  if (uc < 0x80)
-    /* The case n >= 1 is already handled by the caller.  */
-    return -2;
-  else if (uc < 0x800)
-    count = 2;
-  else if (uc < 0x10000)
-    {
-      if (uc < 0xd800 || uc >= 0xe000)
-	count = 3;
-      else
-	return -1;
-    }
-#if 0
-  else if (uc < 0x200000)
-    count = 4;
-  else if (uc < 0x4000000)
-    count = 5;
-  else if (uc <= 0x7fffffff)
-    count = 6;
-#else
-  else if (uc < 0x110000)
-    count = 4;
-#endif
-  else
-    return -1;
-
-  if (n < count)
-    return -2;
-
-  switch (count) /* note: code falls through cases! */
-    {
-#if 0
-    case 6: s[5] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x4000000;
-    case 5: s[4] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x200000;
-#endif
-    case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
-    case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
-    case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
-  /*case 1:*/ s[0] = uc;
-    }
-  return count;
-}