deleted file mode 100644
--- a/lib/strstr.c
+++ /dev/null
@@ -1,126 +0,0 @@
-/* Searching in a string.
-   Copyright (C) 2005-2007 Free Software Foundation, Inc.
-   Written by Bruno Haible <bruno@clisp.org>, 2005.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU 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 General Public License for more details.
-
-   You should have received a copy of the GNU 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 <string.h>
-
-#include <stddef.h>  /* for NULL, in case a nonstandard string.h lacks it */
-
-#if HAVE_MBRTOWC
-# include "mbuiter.h"
-#endif
-
-/* Find the first occurrence of NEEDLE in HAYSTACK.  */
-char *
-strstr (const char *haystack, const char *needle)
-{
-  /* Be careful not to look at the entire extent of haystack or needle
-     until needed.  This is useful because of these two cases:
-       - haystack may be very long, and a match of needle found early,
-       - needle may be very long, and not even a short initial segment of
-         needle may be found in haystack.  */
-#if HAVE_MBRTOWC
-  if (MB_CUR_MAX > 1)
-    {
-      mbui_iterator_t iter_needle;
-
-      mbui_init (iter_needle, needle);
-      if (mbui_avail (iter_needle))
-	{
-	  mbui_iterator_t iter_haystack;
-
-	  mbui_init (iter_haystack, haystack);
-	  for (;; mbui_advance (iter_haystack))
-	    {
-	      if (!mbui_avail (iter_haystack))
-		/* No match.  */
-		return NULL;
-
-	      if (mb_equal (mbui_cur (iter_haystack), mbui_cur (iter_needle)))
-		/* The first character matches.  */
-		{
-		  mbui_iterator_t rhaystack;
-		  mbui_iterator_t rneedle;
-
-		  memcpy (&rhaystack, &iter_haystack, sizeof (mbui_iterator_t));
-		  mbui_advance (rhaystack);
-
-		  mbui_init (rneedle, needle);
-		  if (!mbui_avail (rneedle))
-		    abort ();
-		  mbui_advance (rneedle);
-
-		  for (;; mbui_advance (rhaystack), mbui_advance (rneedle))
-		    {
-		      if (!mbui_avail (rneedle))
-			/* Found a match.  */
-			return (char *) mbui_cur_ptr (iter_haystack);
-		      if (!mbui_avail (rhaystack))
-			/* No match.  */
-			return NULL;
-		      if (!mb_equal (mbui_cur (rhaystack), mbui_cur (rneedle)))
-			/* Nothing in this round.  */
-			break;
-		    }
-		}
-	    }
-	}
-      else
-	return (char *) haystack;
-    }
-  else
-#endif
-    {
-      if (*needle != '\0')
-	{
-	  /* Speed up the following searches of needle by caching its first
-	     character.  */
-	  char b = *needle++;
-
-	  for (;; haystack++)
-	    {
-	      if (*haystack == '\0')
-		/* No match.  */
-		return NULL;
-	      if (*haystack == b)
-		/* The first character matches.  */
-		{
-		  const char *rhaystack = haystack + 1;
-		  const char *rneedle = needle;
-
-		  for (;; rhaystack++, rneedle++)
-		    {
-		      if (*rneedle == '\0')
-			/* Found a match.  */
-			return (char *) haystack;
-		      if (*rhaystack == '\0')
-			/* No match.  */
-			return NULL;
-		      if (*rhaystack != *rneedle)
-			/* Nothing in this round.  */
-			break;
-		    }
-		}
-	    }
-	}
-      else
-	return (char *) haystack;
-    }
-}