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diff --git a/m4/include_next.m4 b/m4/include_next.m4
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--- a/m4/include_next.m4
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-# include_next.m4 serial 23
-dnl Copyright (C) 2006-2014 Free Software Foundation, Inc.
-dnl This file is free software; the Free Software Foundation
-dnl gives unlimited permission to copy and/or distribute it,
-dnl with or without modifications, as long as this notice is preserved.
-
-dnl From Paul Eggert and Derek Price.
-
-dnl Sets INCLUDE_NEXT and PRAGMA_SYSTEM_HEADER.
-dnl
-dnl INCLUDE_NEXT expands to 'include_next' if the compiler supports it, or to
-dnl 'include' otherwise.
-dnl
-dnl INCLUDE_NEXT_AS_FIRST_DIRECTIVE expands to 'include_next' if the compiler
-dnl supports it in the special case that it is the first include directive in
-dnl the given file, or to 'include' otherwise.
-dnl
-dnl PRAGMA_SYSTEM_HEADER can be used in files that contain #include_next,
-dnl so as to avoid GCC warnings when the gcc option -pedantic is used.
-dnl '#pragma GCC system_header' has the same effect as if the file was found
-dnl through the include search path specified with '-isystem' options (as
-dnl opposed to the search path specified with '-I' options). Namely, gcc
-dnl does not warn about some things, and on some systems (Solaris and Interix)
-dnl __STDC__ evaluates to 0 instead of to 1. The latter is an undesired side
-dnl effect; we are therefore careful to use 'defined __STDC__' or '1' instead
-dnl of plain '__STDC__'.
-dnl
-dnl PRAGMA_COLUMNS can be used in files that override system header files, so
-dnl as to avoid compilation errors on HP NonStop systems when the gnulib file
-dnl is included by a system header file that does a "#pragma COLUMNS 80" (which
-dnl has the effect of truncating the lines of that file and all files that it
-dnl includes to 80 columns) and the gnulib file has lines longer than 80
-dnl columns.
-
-AC_DEFUN([gl_INCLUDE_NEXT],
-[
- AC_LANG_PREPROC_REQUIRE()
- AC_CACHE_CHECK([whether the preprocessor supports include_next],
- [gl_cv_have_include_next],
- [rm -rf conftestd1a conftestd1b conftestd2
- mkdir conftestd1a conftestd1b conftestd2
- dnl IBM C 9.0, 10.1 (original versions, prior to the 2009-01 updates) on
- dnl AIX 6.1 support include_next when used as first preprocessor directive
- dnl in a file, but not when preceded by another include directive. Check
- dnl for this bug by including <stdio.h>.
- dnl Additionally, with this same compiler, include_next is a no-op when
- dnl used in a header file that was included by specifying its absolute
- dnl file name. Despite these two bugs, include_next is used in the
- dnl compiler's <math.h>. By virtue of the second bug, we need to use
- dnl include_next as well in this case.
- cat <<EOF > conftestd1a/conftest.h
-#define DEFINED_IN_CONFTESTD1
-#include_next <conftest.h>
-#ifdef DEFINED_IN_CONFTESTD2
-int foo;
-#else
-#error "include_next doesn't work"
-#endif
-EOF
- cat <<EOF > conftestd1b/conftest.h
-#define DEFINED_IN_CONFTESTD1
-#include <stdio.h>
-#include_next <conftest.h>
-#ifdef DEFINED_IN_CONFTESTD2
-int foo;
-#else
-#error "include_next doesn't work"
-#endif
-EOF
- cat <<EOF > conftestd2/conftest.h
-#ifndef DEFINED_IN_CONFTESTD1
-#error "include_next test doesn't work"
-#endif
-#define DEFINED_IN_CONFTESTD2
-EOF
- gl_save_CPPFLAGS="$CPPFLAGS"
- CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1b -Iconftestd2"
-dnl We intentionally avoid using AC_LANG_SOURCE here.
- AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[#include <conftest.h>]],
- [gl_cv_have_include_next=yes],
- [CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1a -Iconftestd2"
- AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[#include <conftest.h>]],
- [gl_cv_have_include_next=buggy],
- [gl_cv_have_include_next=no])
- ])
- CPPFLAGS="$gl_save_CPPFLAGS"
- rm -rf conftestd1a conftestd1b conftestd2
- ])
- PRAGMA_SYSTEM_HEADER=
- if test $gl_cv_have_include_next = yes; then
- INCLUDE_NEXT=include_next
- INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include_next
- if test -n "$GCC"; then
- PRAGMA_SYSTEM_HEADER='#pragma GCC system_header'
- fi
- else
- if test $gl_cv_have_include_next = buggy; then
- INCLUDE_NEXT=include
- INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include_next
- else
- INCLUDE_NEXT=include
- INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include
- fi
- fi
- AC_SUBST([INCLUDE_NEXT])
- AC_SUBST([INCLUDE_NEXT_AS_FIRST_DIRECTIVE])
- AC_SUBST([PRAGMA_SYSTEM_HEADER])
- AC_CACHE_CHECK([whether system header files limit the line length],
- [gl_cv_pragma_columns],
- [dnl HP NonStop systems, which define __TANDEM, have this misfeature.
- AC_EGREP_CPP([choke me],
- [
-#ifdef __TANDEM
-choke me
-#endif
- ],
- [gl_cv_pragma_columns=yes],
- [gl_cv_pragma_columns=no])
- ])
- if test $gl_cv_pragma_columns = yes; then
- PRAGMA_COLUMNS="#pragma COLUMNS 10000"
- else
- PRAGMA_COLUMNS=
- fi
- AC_SUBST([PRAGMA_COLUMNS])
-])
-
-# gl_CHECK_NEXT_HEADERS(HEADER1 HEADER2 ...)
-# ------------------------------------------
-# For each arg foo.h, if #include_next works, define NEXT_FOO_H to be
-# '<foo.h>'; otherwise define it to be
-# '"///usr/include/foo.h"', or whatever other absolute file name is suitable.
-# Also, if #include_next works as first preprocessing directive in a file,
-# define NEXT_AS_FIRST_DIRECTIVE_FOO_H to be '<foo.h>'; otherwise define it to
-# be
-# '"///usr/include/foo.h"', or whatever other absolute file name is suitable.
-# That way, a header file with the following line:
-# #@INCLUDE_NEXT@ @NEXT_FOO_H@
-# or
-# #@INCLUDE_NEXT_AS_FIRST_DIRECTIVE@ @NEXT_AS_FIRST_DIRECTIVE_FOO_H@
-# behaves (after sed substitution) as if it contained
-# #include_next <foo.h>
-# even if the compiler does not support include_next.
-# The three "///" are to pacify Sun C 5.8, which otherwise would say
-# "warning: #include of /usr/include/... may be non-portable".
-# Use '""', not '<>', so that the /// cannot be confused with a C99 comment.
-# Note: This macro assumes that the header file is not empty after
-# preprocessing, i.e. it does not only define preprocessor macros but also
-# provides some type/enum definitions or function/variable declarations.
-#
-# This macro also checks whether each header exists, by invoking
-# AC_CHECK_HEADERS_ONCE or AC_CHECK_HEADERS on each argument.
-AC_DEFUN([gl_CHECK_NEXT_HEADERS],
-[
- gl_NEXT_HEADERS_INTERNAL([$1], [check])
-])
-
-# gl_NEXT_HEADERS(HEADER1 HEADER2 ...)
-# ------------------------------------
-# Like gl_CHECK_NEXT_HEADERS, except do not check whether the headers exist.
-# This is suitable for headers like <stddef.h> that are standardized by C89
-# and therefore can be assumed to exist.
-AC_DEFUN([gl_NEXT_HEADERS],
-[
- gl_NEXT_HEADERS_INTERNAL([$1], [assume])
-])
-
-# The guts of gl_CHECK_NEXT_HEADERS and gl_NEXT_HEADERS.
-AC_DEFUN([gl_NEXT_HEADERS_INTERNAL],
-[
- AC_REQUIRE([gl_INCLUDE_NEXT])
- AC_REQUIRE([AC_CANONICAL_HOST])
-
- m4_if([$2], [check],
- [AC_CHECK_HEADERS_ONCE([$1])
- ])
-
-dnl FIXME: gl_next_header and gl_header_exists must be used unquoted
-dnl until we can assume autoconf 2.64 or newer.
- m4_foreach_w([gl_HEADER_NAME], [$1],
- [AS_VAR_PUSHDEF([gl_next_header],
- [gl_cv_next_]m4_defn([gl_HEADER_NAME]))
- if test $gl_cv_have_include_next = yes; then
- AS_VAR_SET(gl_next_header, ['<'gl_HEADER_NAME'>'])
- else
- AC_CACHE_CHECK(
- [absolute name of <]m4_defn([gl_HEADER_NAME])[>],
- m4_defn([gl_next_header]),
- [m4_if([$2], [check],
- [AS_VAR_PUSHDEF([gl_header_exists],
- [ac_cv_header_]m4_defn([gl_HEADER_NAME]))
- if test AS_VAR_GET(gl_header_exists) = yes; then
- AS_VAR_POPDEF([gl_header_exists])
- ])
- gl_ABSOLUTE_HEADER_ONE(gl_HEADER_NAME)
- AS_VAR_COPY([gl_header], [gl_cv_absolute_]AS_TR_SH(gl_HEADER_NAME))
- AS_VAR_SET(gl_next_header, ['"'$gl_header'"'])
- m4_if([$2], [check],
- [else
- AS_VAR_SET(gl_next_header, ['<'gl_HEADER_NAME'>'])
- fi
- ])
- ])
- fi
- AC_SUBST(
- AS_TR_CPP([NEXT_]m4_defn([gl_HEADER_NAME])),
- [AS_VAR_GET(gl_next_header)])
- if test $gl_cv_have_include_next = yes || test $gl_cv_have_include_next = buggy; then
- # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include_next'
- gl_next_as_first_directive='<'gl_HEADER_NAME'>'
- else
- # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include'
- gl_next_as_first_directive=AS_VAR_GET(gl_next_header)
- fi
- AC_SUBST(
- AS_TR_CPP([NEXT_AS_FIRST_DIRECTIVE_]m4_defn([gl_HEADER_NAME])),
- [$gl_next_as_first_directive])
- AS_VAR_POPDEF([gl_next_header])])
-])
-
-# Autoconf 2.68 added warnings for our use of AC_COMPILE_IFELSE;
-# this fallback is safe for all earlier autoconf versions.
-m4_define_default([AC_LANG_DEFINES_PROVIDED])