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diff --git a/m4/regex.m4 b/m4/regex.m4
--- a/m4/regex.m4
+++ /dev/null
@@ -1,187 +0,0 @@
-#serial 31
-
-# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
-# Software Foundation, Inc.
-#
-# This file is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-dnl Initially derived from code in GNU grep.
-dnl Mostly written by Jim Meyering.
-
-AC_PREREQ([2.50])
-
-AC_DEFUN([gl_REGEX],
-[
- AC_REQUIRE([AC_SYS_LARGEFILE]) dnl for a sufficently-wide off_t
-
- AC_CACHE_CHECK([whether off_t can be used in a switch statement],
- [gl_cv_type_off_t_switch],
- [AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [AC_INCLUDES_DEFAULT],
- [[off_t o = -1;
- switch (o)
- {
- case -2:
- return 1;
- case -1:
- return 2;
- default:
- return 0;
- }
- ]])],
- [gl_cv_type_off_t_switch=yes],
- [gl_cv_type_off_t_switch=no])])
- if test $gl_cv_type_off_t_switch = yes; then
- AC_DEFINE([_REGEX_LARGE_OFFSETS], 1,
- [Define if you want regoff_t to be at least as wide POSIX requires.])
- fi
-
- AC_LIBSOURCES(
- [regcomp.c, regex.c, regex.h,
- regex_internal.c, regex_internal.h, regexec.c])
-
- AC_ARG_WITH([included-regex],
- [AC_HELP_STRING([--without-included-regex],
- [don't compile regex; this is the default on
- systems with recent-enough versions of the GNU C
- Library (use with caution on other systems)])])
-
- case $with_included_regex in
- yes|no) ac_use_included_regex=$with_included_regex
- ;;
- '')
- # If the system regex support is good enough that it passes the the
- # following run test, then default to *not* using the included regex.c.
- # If cross compiling, assume the test would fail and use the included
- # regex.c. The first failing regular expression is from `Spencer ere
- # test #75' in grep-2.3.
- AC_CACHE_CHECK([for working re_compile_pattern],
- [gl_cv_func_re_compile_pattern_broken],
- [AC_RUN_IFELSE(
- [AC_LANG_PROGRAM(
- [AC_INCLUDES_DEFAULT
- #include <regex.h>],
- [[static struct re_pattern_buffer regex;
- const char *s;
- struct re_registers regs;
- /* Use the POSIX-compliant spelling with leading REG_,
- rather than the traditional GNU spelling with leading RE_,
- so that we reject older libc implementations. */
- re_set_syntax (REG_SYNTAX_POSIX_EGREP);
- memset (®ex, 0, sizeof (regex));
- s = re_compile_pattern ("a[:@:>@:]b\n", 9, ®ex);
- /* This should fail with _Invalid character class name_ error. */
- if (!s)
- exit (1);
-
- /* This should succeed, but does not for e.g. glibc-2.1.3. */
- memset (®ex, 0, sizeof (regex));
- s = re_compile_pattern ("{1", 2, ®ex);
-
- if (s)
- exit (1);
-
- /* The following example is derived from a problem report
- against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
- memset (®ex, 0, sizeof (regex));
- s = re_compile_pattern ("[an\371]*n", 7, ®ex);
- if (s)
- exit (1);
-
- /* This should match, but does not for e.g. glibc-2.2.1. */
- if (re_match (®ex, "an", 2, 0, ®s) != 2)
- exit (1);
-
- memset (®ex, 0, sizeof (regex));
- s = re_compile_pattern ("x", 1, ®ex);
- if (s)
- exit (1);
-
- /* The version of regex.c in e.g. GNU libc-2.2.93 did not
- work with a negative RANGE argument. */
- if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
- exit (1);
-
- /* The version of regex.c in older versions of gnulib
- ignored REG_IGNORE_CASE (which was then called RE_ICASE).
- Detect that problem too. */
- memset (®ex, 0, sizeof (regex));
- re_set_syntax (REG_SYNTAX_EMACS | REG_IGNORE_CASE);
- s = re_compile_pattern ("x", 1, ®ex);
- if (s)
- exit (1);
-
- if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
- exit (1);
-
- /* REG_STARTEND was added to glibc on 2004-01-15.
- Reject older versions. */
- if (! REG_STARTEND)
- exit (1);
-
- /* Reject hosts whose regoff_t values are too narrow.
- These include glibc 2.3.5 on hosts with 64-bit off_t
- and 32-bit int, and Solaris 10 on hosts with 32-bit int
- and _FILE_OFFSET_BITS=64. */
- if (sizeof (regoff_t) < sizeof (off_t))
- exit (1);
-
- exit (0);]])],
- [gl_cv_func_re_compile_pattern_broken=no],
- [gl_cv_func_re_compile_pattern_broken=yes],
- dnl When crosscompiling, assume it is broken.
- [gl_cv_func_re_compile_pattern_broken=yes])])
- ac_use_included_regex=$gl_cv_func_re_compile_pattern_broken
- ;;
- *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
- ;;
- esac
-
- if test $ac_use_included_regex = yes; then
- AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
- [Define to rpl_re_syntax_options if the replacement should be used.])
- AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
- [Define to rpl_re_set_syntax if the replacement should be used.])
- AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
- [Define to rpl_re_compile_pattern if the replacement should be used.])
- AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
- [Define to rpl_re_compile_fastmap if the replacement should be used.])
- AC_DEFINE([re_search], [rpl_re_search],
- [Define to rpl_re_search if the replacement should be used.])
- AC_DEFINE([re_search_2], [rpl_re_search_2],
- [Define to rpl_re_search_2 if the replacement should be used.])
- AC_DEFINE([re_match], [rpl_re_match],
- [Define to rpl_re_match if the replacement should be used.])
- AC_DEFINE([re_match_2], [rpl_re_match_2],
- [Define to rpl_re_match_2 if the replacement should be used.])
- AC_DEFINE([re_set_registers], [rpl_re_set_registers],
- [Define to rpl_re_set_registers if the replacement should be used.])
- AC_DEFINE([re_comp], [rpl_re_comp],
- [Define to rpl_re_comp if the replacement should be used.])
- AC_DEFINE([re_exec], [rpl_re_exec],
- [Define to rpl_re_exec if the replacement should be used.])
- AC_DEFINE([regcomp], [rpl_regcomp],
- [Define to rpl_regcomp if the replacement should be used.])
- AC_DEFINE([regexec], [rpl_regexec],
- [Define to rpl_regexec if the replacement should be used.])
- AC_DEFINE([regerror], [rpl_regerror],
- [Define to rpl_regerror if the replacement should be used.])
- AC_DEFINE([regfree], [rpl_regfree],
- [Define to rpl_regfree if the replacement should be used.])
- AC_LIBOBJ([regex])
- gl_PREREQ_REGEX
- fi
-])
-
-# Prerequisites of lib/regex.c and lib/regex_internal.c.
-AC_DEFUN([gl_PREREQ_REGEX],
-[
- AC_REQUIRE([AC_GNU_SOURCE])
- AC_REQUIRE([gl_C_RESTRICT])
- AC_REQUIRE([AM_LANGINFO_CODESET])
- AC_CHECK_HEADERS_ONCE([locale.h wchar.h wctype.h])
- AC_CHECK_FUNCS_ONCE([isblank mbrtowc mempcpy wcrtomb wcscoll])
-])