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diff --git a/lib/c-strcaseeq.h b/lib/c-strcaseeq.h
deleted file mode 100644
index afdea26..0000000
--- a/lib/c-strcaseeq.h
+++ /dev/null
@@ -1,184 +0,0 @@
-/* Optimized case-insensitive string comparison in C locale.
-   Copyright (C) 2001-2002, 2007, 2009-2013 Free Software Foundation, Inc.
-
-   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */
-
-/* Written by Bruno Haible <bruno@clisp.org>.  */
-
-#include "c-strcase.h"
-#include "c-ctype.h"
-
-/* STRCASEEQ allows to optimize string comparison with a small literal string.
-     STRCASEEQ (s, "UTF-8", 'U','T','F','-','8',0,0,0,0)
-   is semantically equivalent to
-     c_strcasecmp (s, "UTF-8") == 0
-   just faster.  */
-
-/* Help GCC to generate good code for string comparisons with
-   immediate strings. */
-#if defined (__GNUC__) && defined (__OPTIMIZE__)
-
-/* Case insensitive comparison of ASCII characters.  */
-# if C_CTYPE_ASCII
-#  define CASEEQ(other,upper) \
-     (c_isupper (upper) ? ((other) & ~0x20) == (upper) : (other) == (upper))
-# elif C_CTYPE_CONSECUTIVE_UPPERCASE && C_CTYPE_CONSECUTIVE_LOWERCASE
-#  define CASEEQ(other,upper) \
-     (c_isupper (upper) ? (other) == (upper) || (other) == (upper) - 'A' + 'a' : (other) == (upper))
-# else
-#  define CASEEQ(other,upper) \
-     (c_toupper (other) == (upper))
-# endif
-
-static inline int
-strcaseeq9 (const char *s1, const char *s2)
-{
-  return c_strcasecmp (s1 + 9, s2 + 9) == 0;
-}
-
-static inline int
-strcaseeq8 (const char *s1, const char *s2, char s28)
-{
-  if (CASEEQ (s1[8], s28))
-    {
-      if (s28 == 0)
-        return 1;
-      else
-        return strcaseeq9 (s1, s2);
-    }
-  else
-    return 0;
-}
-
-static inline int
-strcaseeq7 (const char *s1, const char *s2, char s27, char s28)
-{
-  if (CASEEQ (s1[7], s27))
-    {
-      if (s27 == 0)
-        return 1;
-      else
-        return strcaseeq8 (s1, s2, s28);
-    }
-  else
-    return 0;
-}
-
-static inline int
-strcaseeq6 (const char *s1, const char *s2, char s26, char s27, char s28)
-{
-  if (CASEEQ (s1[6], s26))
-    {
-      if (s26 == 0)
-        return 1;
-      else
-        return strcaseeq7 (s1, s2, s27, s28);
-    }
-  else
-    return 0;
-}
-
-static inline int
-strcaseeq5 (const char *s1, const char *s2, char s25, char s26, char s27, char s28)
-{
-  if (CASEEQ (s1[5], s25))
-    {
-      if (s25 == 0)
-        return 1;
-      else
-        return strcaseeq6 (s1, s2, s26, s27, s28);
-    }
-  else
-    return 0;
-}
-
-static inline int
-strcaseeq4 (const char *s1, const char *s2, char s24, char s25, char s26, char s27, char s28)
-{
-  if (CASEEQ (s1[4], s24))
-    {
-      if (s24 == 0)
-        return 1;
-      else
-        return strcaseeq5 (s1, s2, s25, s26, s27, s28);
-    }
-  else
-    return 0;
-}
-
-static inline int
-strcaseeq3 (const char *s1, const char *s2, char s23, char s24, char s25, char s26, char s27, char s28)
-{
-  if (CASEEQ (s1[3], s23))
-    {
-      if (s23 == 0)
-        return 1;
-      else
-        return strcaseeq4 (s1, s2, s24, s25, s26, s27, s28);
-    }
-  else
-    return 0;
-}
-
-static inline int
-strcaseeq2 (const char *s1, const char *s2, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
-{
-  if (CASEEQ (s1[2], s22))
-    {
-      if (s22 == 0)
-        return 1;
-      else
-        return strcaseeq3 (s1, s2, s23, s24, s25, s26, s27, s28);
-    }
-  else
-    return 0;
-}
-
-static inline int
-strcaseeq1 (const char *s1, const char *s2, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
-{
-  if (CASEEQ (s1[1], s21))
-    {
-      if (s21 == 0)
-        return 1;
-      else
-        return strcaseeq2 (s1, s2, s22, s23, s24, s25, s26, s27, s28);
-    }
-  else
-    return 0;
-}
-
-static inline int
-strcaseeq0 (const char *s1, const char *s2, char s20, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
-{
-  if (CASEEQ (s1[0], s20))
-    {
-      if (s20 == 0)
-        return 1;
-      else
-        return strcaseeq1 (s1, s2, s21, s22, s23, s24, s25, s26, s27, s28);
-    }
-  else
-    return 0;
-}
-
-#define STRCASEEQ(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \
-  strcaseeq0 (s1, s2, s20, s21, s22, s23, s24, s25, s26, s27, s28)
-
-#else
-
-#define STRCASEEQ(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \
-  (c_strcasecmp (s1, s2) == 0)
-
-#endif