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    1 # generated automatically by aclocal 1.16.3 -*- Autoconf -*-
    2 
    3 # Copyright (C) 1996-2020 Free Software Foundation, Inc.
    4 
    5 # This file is free software; the Free Software Foundation
    6 # gives unlimited permission to copy and/or distribute it,
    7 # with or without modifications, as long as this notice is preserved.
    8 
    9 # This program is distributed in the hope that it will be useful,
   10 # but WITHOUT ANY WARRANTY, to the extent permitted by law; without
   11 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A
   12 # PARTICULAR PURPOSE.
   13 
   14 m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
   15 m4_ifndef([AC_AUTOCONF_VERSION],
   16   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
   17 m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.71],,
   18 [m4_warning([this file was generated for autoconf 2.71.
   19 You have another version of autoconf.  It may work, but is not guaranteed to.
   20 If you have problems, you may need to regenerate the build system entirely.
   21 To do so, use the procedure documented by the package, typically 'autoreconf'.])])
   22 
   23 # pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
   24 # serial 11 (pkg-config-0.29.1)
   25 
   26 dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
   27 dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
   28 dnl
   29 dnl This program is free software; you can redistribute it and/or modify
   30 dnl it under the terms of the GNU General Public License as published by
   31 dnl the Free Software Foundation; either version 2 of the License, or
   32 dnl (at your option) any later version.
   33 dnl
   34 dnl This program is distributed in the hope that it will be useful, but
   35 dnl WITHOUT ANY WARRANTY; without even the implied warranty of
   36 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   37 dnl General Public License for more details.
   38 dnl
   39 dnl You should have received a copy of the GNU General Public License
   40 dnl along with this program; if not, write to the Free Software
   41 dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
   42 dnl 02111-1307, USA.
   43 dnl
   44 dnl As a special exception to the GNU General Public License, if you
   45 dnl distribute this file as part of a program that contains a
   46 dnl configuration script generated by Autoconf, you may include it under
   47 dnl the same distribution terms that you use for the rest of that
   48 dnl program.
   49 
   50 dnl PKG_PREREQ(MIN-VERSION)
   51 dnl -----------------------
   52 dnl Since: 0.29
   53 dnl
   54 dnl Verify that the version of the pkg-config macros are at least
   55 dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's
   56 dnl installed version of pkg-config, this checks the developer's version
   57 dnl of pkg.m4 when generating configure.
   58 dnl
   59 dnl To ensure that this macro is defined, also add:
   60 dnl m4_ifndef([PKG_PREREQ],
   61 dnl     [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])])
   62 dnl
   63 dnl See the "Since" comment for each macro you use to see what version
   64 dnl of the macros you require.
   65 m4_defun([PKG_PREREQ],
   66 [m4_define([PKG_MACROS_VERSION], [0.29.1])
   67 m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
   68     [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
   69 ])dnl PKG_PREREQ
   70 
   71 dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
   72 dnl ----------------------------------
   73 dnl Since: 0.16
   74 dnl
   75 dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
   76 dnl first found in the path. Checks that the version of pkg-config found
   77 dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
   78 dnl used since that's the first version where most current features of
   79 dnl pkg-config existed.
   80 AC_DEFUN([PKG_PROG_PKG_CONFIG],
   81 [m4_pattern_forbid([^_?PKG_[A-Z_]+$])
   82 m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
   83 m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$])
   84 AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
   85 AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
   86 AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path])
   87 
   88 if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
   89 	AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
   90 fi
   91 if test -n "$PKG_CONFIG"; then
   92 	_pkg_min_version=m4_default([$1], [0.9.0])
   93 	AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
   94 	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
   95 		AC_MSG_RESULT([yes])
   96 	else
   97 		AC_MSG_RESULT([no])
   98 		PKG_CONFIG=""
   99 	fi
  100 fi[]dnl
  101 ])dnl PKG_PROG_PKG_CONFIG
  102 
  103 dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
  104 dnl -------------------------------------------------------------------
  105 dnl Since: 0.18
  106 dnl
  107 dnl Check to see whether a particular set of modules exists. Similar to
  108 dnl PKG_CHECK_MODULES(), but does not set variables or print errors.
  109 dnl
  110 dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
  111 dnl only at the first occurence in configure.ac, so if the first place
  112 dnl it's called might be skipped (such as if it is within an "if", you
  113 dnl have to call PKG_CHECK_EXISTS manually
  114 AC_DEFUN([PKG_CHECK_EXISTS],
  115 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
  116 if test -n "$PKG_CONFIG" && \
  117     AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
  118   m4_default([$2], [:])
  119 m4_ifvaln([$3], [else
  120   $3])dnl
  121 fi])
  122 
  123 dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
  124 dnl ---------------------------------------------
  125 dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting
  126 dnl pkg_failed based on the result.
  127 m4_define([_PKG_CONFIG],
  128 [if test -n "$$1"; then
  129     pkg_cv_[]$1="$$1"
  130  elif test -n "$PKG_CONFIG"; then
  131     PKG_CHECK_EXISTS([$3],
  132                      [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`
  133 		      test "x$?" != "x0" && pkg_failed=yes ],
  134 		     [pkg_failed=yes])
  135  else
  136     pkg_failed=untried
  137 fi[]dnl
  138 ])dnl _PKG_CONFIG
  139 
  140 dnl _PKG_SHORT_ERRORS_SUPPORTED
  141 dnl ---------------------------
  142 dnl Internal check to see if pkg-config supports short errors.
  143 AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
  144 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])
  145 if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
  146         _pkg_short_errors_supported=yes
  147 else
  148         _pkg_short_errors_supported=no
  149 fi[]dnl
  150 ])dnl _PKG_SHORT_ERRORS_SUPPORTED
  151 
  152 
  153 dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
  154 dnl   [ACTION-IF-NOT-FOUND])
  155 dnl --------------------------------------------------------------
  156 dnl Since: 0.4.0
  157 dnl
  158 dnl Note that if there is a possibility the first call to
  159 dnl PKG_CHECK_MODULES might not happen, you should be sure to include an
  160 dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
  161 AC_DEFUN([PKG_CHECK_MODULES],
  162 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
  163 AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
  164 AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
  165 
  166 pkg_failed=no
  167 AC_MSG_CHECKING([for $1])
  168 
  169 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
  170 _PKG_CONFIG([$1][_LIBS], [libs], [$2])
  171 
  172 m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
  173 and $1[]_LIBS to avoid the need to call pkg-config.
  174 See the pkg-config man page for more details.])
  175 
  176 if test $pkg_failed = yes; then
  177    	AC_MSG_RESULT([no])
  178         _PKG_SHORT_ERRORS_SUPPORTED
  179         if test $_pkg_short_errors_supported = yes; then
  180 	        $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
  181         else 
  182 	        $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
  183         fi
  184 	# Put the nasty error message in config.log where it belongs
  185 	echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
  186 
  187 	m4_default([$4], [AC_MSG_ERROR(
  188 [Package requirements ($2) were not met:
  189 
  190 $$1_PKG_ERRORS
  191 
  192 Consider adjusting the PKG_CONFIG_PATH environment variable if you
  193 installed software in a non-standard prefix.
  194 
  195 _PKG_TEXT])[]dnl
  196         ])
  197 elif test $pkg_failed = untried; then
  198      	AC_MSG_RESULT([no])
  199 	m4_default([$4], [AC_MSG_FAILURE(
  200 [The pkg-config script could not be found or is too old.  Make sure it
  201 is in your PATH or set the PKG_CONFIG environment variable to the full
  202 path to pkg-config.
  203 
  204 _PKG_TEXT
  205 
  206 To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
  207         ])
  208 else
  209 	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
  210 	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS
  211         AC_MSG_RESULT([yes])
  212 	$3
  213 fi[]dnl
  214 ])dnl PKG_CHECK_MODULES
  215 
  216 
  217 dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
  218 dnl   [ACTION-IF-NOT-FOUND])
  219 dnl ---------------------------------------------------------------------
  220 dnl Since: 0.29
  221 dnl
  222 dnl Checks for existence of MODULES and gathers its build flags with
  223 dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags
  224 dnl and VARIABLE-PREFIX_LIBS from --libs.
  225 dnl
  226 dnl Note that if there is a possibility the first call to
  227 dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to
  228 dnl include an explicit call to PKG_PROG_PKG_CONFIG in your
  229 dnl configure.ac.
  230 AC_DEFUN([PKG_CHECK_MODULES_STATIC],
  231 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
  232 _save_PKG_CONFIG=$PKG_CONFIG
  233 PKG_CONFIG="$PKG_CONFIG --static"
  234 PKG_CHECK_MODULES($@)
  235 PKG_CONFIG=$_save_PKG_CONFIG[]dnl
  236 ])dnl PKG_CHECK_MODULES_STATIC
  237 
  238 
  239 dnl PKG_INSTALLDIR([DIRECTORY])
  240 dnl -------------------------
  241 dnl Since: 0.27
  242 dnl
  243 dnl Substitutes the variable pkgconfigdir as the location where a module
  244 dnl should install pkg-config .pc files. By default the directory is
  245 dnl $libdir/pkgconfig, but the default can be changed by passing
  246 dnl DIRECTORY. The user can override through the --with-pkgconfigdir
  247 dnl parameter.
  248 AC_DEFUN([PKG_INSTALLDIR],
  249 [m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])])
  250 m4_pushdef([pkg_description],
  251     [pkg-config installation directory @<:@]pkg_default[@:>@])
  252 AC_ARG_WITH([pkgconfigdir],
  253     [AS_HELP_STRING([--with-pkgconfigdir], pkg_description)],,
  254     [with_pkgconfigdir=]pkg_default)
  255 AC_SUBST([pkgconfigdir], [$with_pkgconfigdir])
  256 m4_popdef([pkg_default])
  257 m4_popdef([pkg_description])
  258 ])dnl PKG_INSTALLDIR
  259 
  260 
  261 dnl PKG_NOARCH_INSTALLDIR([DIRECTORY])
  262 dnl --------------------------------
  263 dnl Since: 0.27
  264 dnl
  265 dnl Substitutes the variable noarch_pkgconfigdir as the location where a
  266 dnl module should install arch-independent pkg-config .pc files. By
  267 dnl default the directory is $datadir/pkgconfig, but the default can be
  268 dnl changed by passing DIRECTORY. The user can override through the
  269 dnl --with-noarch-pkgconfigdir parameter.
  270 AC_DEFUN([PKG_NOARCH_INSTALLDIR],
  271 [m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])])
  272 m4_pushdef([pkg_description],
  273     [pkg-config arch-independent installation directory @<:@]pkg_default[@:>@])
  274 AC_ARG_WITH([noarch-pkgconfigdir],
  275     [AS_HELP_STRING([--with-noarch-pkgconfigdir], pkg_description)],,
  276     [with_noarch_pkgconfigdir=]pkg_default)
  277 AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir])
  278 m4_popdef([pkg_default])
  279 m4_popdef([pkg_description])
  280 ])dnl PKG_NOARCH_INSTALLDIR
  281 
  282 
  283 dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
  284 dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
  285 dnl -------------------------------------------
  286 dnl Since: 0.28
  287 dnl
  288 dnl Retrieves the value of the pkg-config variable for the given module.
  289 AC_DEFUN([PKG_CHECK_VAR],
  290 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
  291 AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl
  292 
  293 _PKG_CONFIG([$1], [variable="][$3]["], [$2])
  294 AS_VAR_COPY([$1], [pkg_cv_][$1])
  295 
  296 AS_VAR_IF([$1], [""], [$5], [$4])dnl
  297 ])dnl PKG_CHECK_VAR
  298 
  299 dnl PKG_WITH_MODULES(VARIABLE-PREFIX, MODULES,
  300 dnl   [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND],
  301 dnl   [DESCRIPTION], [DEFAULT])
  302 dnl ------------------------------------------
  303 dnl
  304 dnl Prepare a "--with-" configure option using the lowercase
  305 dnl [VARIABLE-PREFIX] name, merging the behaviour of AC_ARG_WITH and
  306 dnl PKG_CHECK_MODULES in a single macro.
  307 AC_DEFUN([PKG_WITH_MODULES],
  308 [
  309 m4_pushdef([with_arg], m4_tolower([$1]))
  310 
  311 m4_pushdef([description],
  312            [m4_default([$5], [build with ]with_arg[ support])])
  313 
  314 m4_pushdef([def_arg], [m4_default([$6], [auto])])
  315 m4_pushdef([def_action_if_found], [AS_TR_SH([with_]with_arg)=yes])
  316 m4_pushdef([def_action_if_not_found], [AS_TR_SH([with_]with_arg)=no])
  317 
  318 m4_case(def_arg,
  319             [yes],[m4_pushdef([with_without], [--without-]with_arg)],
  320             [m4_pushdef([with_without],[--with-]with_arg)])
  321 
  322 AC_ARG_WITH(with_arg,
  323      AS_HELP_STRING(with_without, description[ @<:@default=]def_arg[@:>@]),,
  324     [AS_TR_SH([with_]with_arg)=def_arg])
  325 
  326 AS_CASE([$AS_TR_SH([with_]with_arg)],
  327             [yes],[PKG_CHECK_MODULES([$1],[$2],$3,$4)],
  328             [auto],[PKG_CHECK_MODULES([$1],[$2],
  329                                         [m4_n([def_action_if_found]) $3],
  330                                         [m4_n([def_action_if_not_found]) $4])])
  331 
  332 m4_popdef([with_arg])
  333 m4_popdef([description])
  334 m4_popdef([def_arg])
  335 
  336 ])dnl PKG_WITH_MODULES
  337 
  338 dnl PKG_HAVE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
  339 dnl   [DESCRIPTION], [DEFAULT])
  340 dnl -----------------------------------------------
  341 dnl
  342 dnl Convenience macro to trigger AM_CONDITIONAL after PKG_WITH_MODULES
  343 dnl check._[VARIABLE-PREFIX] is exported as make variable.
  344 AC_DEFUN([PKG_HAVE_WITH_MODULES],
  345 [
  346 PKG_WITH_MODULES([$1],[$2],,,[$3],[$4])
  347 
  348 AM_CONDITIONAL([HAVE_][$1],
  349                [test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"])
  350 ])dnl PKG_HAVE_WITH_MODULES
  351 
  352 dnl PKG_HAVE_DEFINE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
  353 dnl   [DESCRIPTION], [DEFAULT])
  354 dnl ------------------------------------------------------
  355 dnl
  356 dnl Convenience macro to run AM_CONDITIONAL and AC_DEFINE after
  357 dnl PKG_WITH_MODULES check. HAVE_[VARIABLE-PREFIX] is exported as make
  358 dnl and preprocessor variable.
  359 AC_DEFUN([PKG_HAVE_DEFINE_WITH_MODULES],
  360 [
  361 PKG_HAVE_WITH_MODULES([$1],[$2],[$3],[$4])
  362 
  363 AS_IF([test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"],
  364         [AC_DEFINE([HAVE_][$1], 1, [Enable ]m4_tolower([$1])[ support])])
  365 ])dnl PKG_HAVE_DEFINE_WITH_MODULES
  366 
  367 # Copyright (C) 2002-2020 Free Software Foundation, Inc.
  368 #
  369 # This file is free software; the Free Software Foundation
  370 # gives unlimited permission to copy and/or distribute it,
  371 # with or without modifications, as long as this notice is preserved.
  372 
  373 # AM_AUTOMAKE_VERSION(VERSION)
  374 # ----------------------------
  375 # Automake X.Y traces this macro to ensure aclocal.m4 has been
  376 # generated from the m4 files accompanying Automake X.Y.
  377 # (This private macro should not be called outside this file.)
  378 AC_DEFUN([AM_AUTOMAKE_VERSION],
  379 [am__api_version='1.16'
  380 dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to
  381 dnl require some minimum version.  Point them to the right macro.
  382 m4_if([$1], [1.16.3], [],
  383       [AC_FATAL([Do not call $0, use AM_INIT_AUTOMAKE([$1]).])])dnl
  384 ])
  385 
  386 # _AM_AUTOCONF_VERSION(VERSION)
  387 # -----------------------------
  388 # aclocal traces this macro to find the Autoconf version.
  389 # This is a private macro too.  Using m4_define simplifies
  390 # the logic in aclocal, which can simply ignore this definition.
  391 m4_define([_AM_AUTOCONF_VERSION], [])
  392 
  393 # AM_SET_CURRENT_AUTOMAKE_VERSION
  394 # -------------------------------
  395 # Call AM_AUTOMAKE_VERSION and AM_AUTOMAKE_VERSION so they can be traced.
  396 # This function is AC_REQUIREd by AM_INIT_AUTOMAKE.
  397 AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION],
  398 [AM_AUTOMAKE_VERSION([1.16.3])dnl
  399 m4_ifndef([AC_AUTOCONF_VERSION],
  400   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
  401 _AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])
  402 
  403 # AM_AUX_DIR_EXPAND                                         -*- Autoconf -*-
  404 
  405 # Copyright (C) 2001-2020 Free Software Foundation, Inc.
  406 #
  407 # This file is free software; the Free Software Foundation
  408 # gives unlimited permission to copy and/or distribute it,
  409 # with or without modifications, as long as this notice is preserved.
  410 
  411 # For projects using AC_CONFIG_AUX_DIR([foo]), Autoconf sets
  412 # $ac_aux_dir to '$srcdir/foo'.  In other projects, it is set to
  413 # '$srcdir', '$srcdir/..', or '$srcdir/../..'.
  414 #
  415 # Of course, Automake must honor this variable whenever it calls a
  416 # tool from the auxiliary directory.  The problem is that $srcdir (and
  417 # therefore $ac_aux_dir as well) can be either absolute or relative,
  418 # depending on how configure is run.  This is pretty annoying, since
  419 # it makes $ac_aux_dir quite unusable in subdirectories: in the top
  420 # source directory, any form will work fine, but in subdirectories a
  421 # relative path needs to be adjusted first.
  422 #
  423 # $ac_aux_dir/missing
  424 #    fails when called from a subdirectory if $ac_aux_dir is relative
  425 # $top_srcdir/$ac_aux_dir/missing
  426 #    fails if $ac_aux_dir is absolute,
  427 #    fails when called from a subdirectory in a VPATH build with
  428 #          a relative $ac_aux_dir
  429 #
  430 # The reason of the latter failure is that $top_srcdir and $ac_aux_dir
  431 # are both prefixed by $srcdir.  In an in-source build this is usually
  432 # harmless because $srcdir is '.', but things will broke when you
  433 # start a VPATH build or use an absolute $srcdir.
  434 #
  435 # So we could use something similar to $top_srcdir/$ac_aux_dir/missing,
  436 # iff we strip the leading $srcdir from $ac_aux_dir.  That would be:
  437 #   am_aux_dir='\$(top_srcdir)/'`expr "$ac_aux_dir" : "$srcdir//*\(.*\)"`
  438 # and then we would define $MISSING as
  439 #   MISSING="\${SHELL} $am_aux_dir/missing"
  440 # This will work as long as MISSING is not called from configure, because
  441 # unfortunately $(top_srcdir) has no meaning in configure.
  442 # However there are other variables, like CC, which are often used in
  443 # configure, and could therefore not use this "fixed" $ac_aux_dir.
  444 #
  445 # Another solution, used here, is to always expand $ac_aux_dir to an
  446 # absolute PATH.  The drawback is that using absolute paths prevent a
  447 # configured tree to be moved without reconfiguration.
  448 
  449 AC_DEFUN([AM_AUX_DIR_EXPAND],
  450 [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
  451 # Expand $ac_aux_dir to an absolute path.
  452 am_aux_dir=`cd "$ac_aux_dir" && pwd`
  453 ])
  454 
  455 # AM_CONDITIONAL                                            -*- Autoconf -*-
  456 
  457 # Copyright (C) 1997-2020 Free Software Foundation, Inc.
  458 #
  459 # This file is free software; the Free Software Foundation
  460 # gives unlimited permission to copy and/or distribute it,
  461 # with or without modifications, as long as this notice is preserved.
  462 
  463 # AM_CONDITIONAL(NAME, SHELL-CONDITION)
  464 # -------------------------------------
  465 # Define a conditional.
  466 AC_DEFUN([AM_CONDITIONAL],
  467 [AC_PREREQ([2.52])dnl
  468  m4_if([$1], [TRUE],  [AC_FATAL([$0: invalid condition: $1])],
  469        [$1], [FALSE], [AC_FATAL([$0: invalid condition: $1])])dnl
  470 AC_SUBST([$1_TRUE])dnl
  471 AC_SUBST([$1_FALSE])dnl
  472 _AM_SUBST_NOTMAKE([$1_TRUE])dnl
  473 _AM_SUBST_NOTMAKE([$1_FALSE])dnl
  474 m4_define([_AM_COND_VALUE_$1], [$2])dnl
  475 if $2; then
  476   $1_TRUE=
  477   $1_FALSE='#'
  478 else
  479   $1_TRUE='#'
  480   $1_FALSE=
  481 fi
  482 AC_CONFIG_COMMANDS_PRE(
  483 [if test -z "${$1_TRUE}" && test -z "${$1_FALSE}"; then
  484   AC_MSG_ERROR([[conditional "$1" was never defined.
  485 Usually this means the macro was only invoked conditionally.]])
  486 fi])])
  487 
  488 # Copyright (C) 1999-2020 Free Software Foundation, Inc.
  489 #
  490 # This file is free software; the Free Software Foundation
  491 # gives unlimited permission to copy and/or distribute it,
  492 # with or without modifications, as long as this notice is preserved.
  493 
  494 
  495 # There are a few dirty hacks below to avoid letting 'AC_PROG_CC' be
  496 # written in clear, in which case automake, when reading aclocal.m4,
  497 # will think it sees a *use*, and therefore will trigger all it's
  498 # C support machinery.  Also note that it means that autoscan, seeing
  499 # CC etc. in the Makefile, will ask for an AC_PROG_CC use...
  500 
  501 
  502 # _AM_DEPENDENCIES(NAME)
  503 # ----------------------
  504 # See how the compiler implements dependency checking.
  505 # NAME is "CC", "CXX", "OBJC", "OBJCXX", "UPC", or "GJC".
  506 # We try a few techniques and use that to set a single cache variable.
  507 #
  508 # We don't AC_REQUIRE the corresponding AC_PROG_CC since the latter was
  509 # modified to invoke _AM_DEPENDENCIES(CC); we would have a circular
  510 # dependency, and given that the user is not expected to run this macro,
  511 # just rely on AC_PROG_CC.
  512 AC_DEFUN([_AM_DEPENDENCIES],
  513 [AC_REQUIRE([AM_SET_DEPDIR])dnl
  514 AC_REQUIRE([AM_OUTPUT_DEPENDENCY_COMMANDS])dnl
  515 AC_REQUIRE([AM_MAKE_INCLUDE])dnl
  516 AC_REQUIRE([AM_DEP_TRACK])dnl
  517 
  518 m4_if([$1], [CC],   [depcc="$CC"   am_compiler_list=],
  519       [$1], [CXX],  [depcc="$CXX"  am_compiler_list=],
  520       [$1], [OBJC], [depcc="$OBJC" am_compiler_list='gcc3 gcc'],
  521       [$1], [OBJCXX], [depcc="$OBJCXX" am_compiler_list='gcc3 gcc'],
  522       [$1], [UPC],  [depcc="$UPC"  am_compiler_list=],
  523       [$1], [GCJ],  [depcc="$GCJ"  am_compiler_list='gcc3 gcc'],
  524                     [depcc="$$1"   am_compiler_list=])
  525 
  526 AC_CACHE_CHECK([dependency style of $depcc],
  527                [am_cv_$1_dependencies_compiler_type],
  528 [if test -z "$AMDEP_TRUE" && test -f "$am_depcomp"; then
  529   # We make a subdir and do the tests there.  Otherwise we can end up
  530   # making bogus files that we don't know about and never remove.  For
  531   # instance it was reported that on HP-UX the gcc test will end up
  532   # making a dummy file named 'D' -- because '-MD' means "put the output
  533   # in D".
  534   rm -rf conftest.dir
  535   mkdir conftest.dir
  536   # Copy depcomp to subdir because otherwise we won't find it if we're
  537   # using a relative directory.
  538   cp "$am_depcomp" conftest.dir
  539   cd conftest.dir
  540   # We will build objects and dependencies in a subdirectory because
  541   # it helps to detect inapplicable dependency modes.  For instance
  542   # both Tru64's cc and ICC support -MD to output dependencies as a
  543   # side effect of compilation, but ICC will put the dependencies in
  544   # the current directory while Tru64 will put them in the object
  545   # directory.
  546   mkdir sub
  547 
  548   am_cv_$1_dependencies_compiler_type=none
  549   if test "$am_compiler_list" = ""; then
  550      am_compiler_list=`sed -n ['s/^#*\([a-zA-Z0-9]*\))$/\1/p'] < ./depcomp`
  551   fi
  552   am__universal=false
  553   m4_case([$1], [CC],
  554     [case " $depcc " in #(
  555      *\ -arch\ *\ -arch\ *) am__universal=true ;;
  556      esac],
  557     [CXX],
  558     [case " $depcc " in #(
  559      *\ -arch\ *\ -arch\ *) am__universal=true ;;
  560      esac])
  561 
  562   for depmode in $am_compiler_list; do
  563     # Setup a source with many dependencies, because some compilers
  564     # like to wrap large dependency lists on column 80 (with \), and
  565     # we should not choose a depcomp mode which is confused by this.
  566     #
  567     # We need to recreate these files for each test, as the compiler may
  568     # overwrite some of them when testing with obscure command lines.
  569     # This happens at least with the AIX C compiler.
  570     : > sub/conftest.c
  571     for i in 1 2 3 4 5 6; do
  572       echo '#include "conftst'$i'.h"' >> sub/conftest.c
  573       # Using ": > sub/conftst$i.h" creates only sub/conftst1.h with
  574       # Solaris 10 /bin/sh.
  575       echo '/* dummy */' > sub/conftst$i.h
  576     done
  577     echo "${am__include} ${am__quote}sub/conftest.Po${am__quote}" > confmf
  578 
  579     # We check with '-c' and '-o' for the sake of the "dashmstdout"
  580     # mode.  It turns out that the SunPro C++ compiler does not properly
  581     # handle '-M -o', and we need to detect this.  Also, some Intel
  582     # versions had trouble with output in subdirs.
  583     am__obj=sub/conftest.${OBJEXT-o}
  584     am__minus_obj="-o $am__obj"
  585     case $depmode in
  586     gcc)
  587       # This depmode causes a compiler race in universal mode.
  588       test "$am__universal" = false || continue
  589       ;;
  590     nosideeffect)
  591       # After this tag, mechanisms are not by side-effect, so they'll
  592       # only be used when explicitly requested.
  593       if test "x$enable_dependency_tracking" = xyes; then
  594 	continue
  595       else
  596 	break
  597       fi
  598       ;;
  599     msvc7 | msvc7msys | msvisualcpp | msvcmsys)
  600       # This compiler won't grok '-c -o', but also, the minuso test has
  601       # not run yet.  These depmodes are late enough in the game, and
  602       # so weak that their functioning should not be impacted.
  603       am__obj=conftest.${OBJEXT-o}
  604       am__minus_obj=
  605       ;;
  606     none) break ;;
  607     esac
  608     if depmode=$depmode \
  609        source=sub/conftest.c object=$am__obj \
  610        depfile=sub/conftest.Po tmpdepfile=sub/conftest.TPo \
  611        $SHELL ./depcomp $depcc -c $am__minus_obj sub/conftest.c \
  612          >/dev/null 2>conftest.err &&
  613        grep sub/conftst1.h sub/conftest.Po > /dev/null 2>&1 &&
  614        grep sub/conftst6.h sub/conftest.Po > /dev/null 2>&1 &&
  615        grep $am__obj sub/conftest.Po > /dev/null 2>&1 &&
  616        ${MAKE-make} -s -f confmf > /dev/null 2>&1; then
  617       # icc doesn't choke on unknown options, it will just issue warnings
  618       # or remarks (even with -Werror).  So we grep stderr for any message
  619       # that says an option was ignored or not supported.
  620       # When given -MP, icc 7.0 and 7.1 complain thusly:
  621       #   icc: Command line warning: ignoring option '-M'; no argument required
  622       # The diagnosis changed in icc 8.0:
  623       #   icc: Command line remark: option '-MP' not supported
  624       if (grep 'ignoring option' conftest.err ||
  625           grep 'not supported' conftest.err) >/dev/null 2>&1; then :; else
  626         am_cv_$1_dependencies_compiler_type=$depmode
  627         break
  628       fi
  629     fi
  630   done
  631 
  632   cd ..
  633   rm -rf conftest.dir
  634 else
  635   am_cv_$1_dependencies_compiler_type=none
  636 fi
  637 ])
  638 AC_SUBST([$1DEPMODE], [depmode=$am_cv_$1_dependencies_compiler_type])
  639 AM_CONDITIONAL([am__fastdep$1], [
  640   test "x$enable_dependency_tracking" != xno \
  641   && test "$am_cv_$1_dependencies_compiler_type" = gcc3])
  642 ])
  643 
  644 
  645 # AM_SET_DEPDIR
  646 # -------------
  647 # Choose a directory name for dependency files.
  648 # This macro is AC_REQUIREd in _AM_DEPENDENCIES.
  649 AC_DEFUN([AM_SET_DEPDIR],
  650 [AC_REQUIRE([AM_SET_LEADING_DOT])dnl
  651 AC_SUBST([DEPDIR], ["${am__leading_dot}deps"])dnl
  652 ])
  653 
  654 
  655 # AM_DEP_TRACK
  656 # ------------
  657 AC_DEFUN([AM_DEP_TRACK],
  658 [AC_ARG_ENABLE([dependency-tracking], [dnl
  659 AS_HELP_STRING(
  660   [--enable-dependency-tracking],
  661   [do not reject slow dependency extractors])
  662 AS_HELP_STRING(
  663   [--disable-dependency-tracking],
  664   [speeds up one-time build])])
  665 if test "x$enable_dependency_tracking" != xno; then
  666   am_depcomp="$ac_aux_dir/depcomp"
  667   AMDEPBACKSLASH='\'
  668   am__nodep='_no'
  669 fi
  670 AM_CONDITIONAL([AMDEP], [test "x$enable_dependency_tracking" != xno])
  671 AC_SUBST([AMDEPBACKSLASH])dnl
  672 _AM_SUBST_NOTMAKE([AMDEPBACKSLASH])dnl
  673 AC_SUBST([am__nodep])dnl
  674 _AM_SUBST_NOTMAKE([am__nodep])dnl
  675 ])
  676 
  677 # Generate code to set up dependency tracking.              -*- Autoconf -*-
  678 
  679 # Copyright (C) 1999-2020 Free Software Foundation, Inc.
  680 #
  681 # This file is free software; the Free Software Foundation
  682 # gives unlimited permission to copy and/or distribute it,
  683 # with or without modifications, as long as this notice is preserved.
  684 
  685 # _AM_OUTPUT_DEPENDENCY_COMMANDS
  686 # ------------------------------
  687 AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
  688 [{
  689   # Older Autoconf quotes --file arguments for eval, but not when files
  690   # are listed without --file.  Let's play safe and only enable the eval
  691   # if we detect the quoting.
  692   # TODO: see whether this extra hack can be removed once we start
  693   # requiring Autoconf 2.70 or later.
  694   AS_CASE([$CONFIG_FILES],
  695           [*\'*], [eval set x "$CONFIG_FILES"],
  696           [*], [set x $CONFIG_FILES])
  697   shift
  698   # Used to flag and report bootstrapping failures.
  699   am_rc=0
  700   for am_mf
  701   do
  702     # Strip MF so we end up with the name of the file.
  703     am_mf=`AS_ECHO(["$am_mf"]) | sed -e 's/:.*$//'`
  704     # Check whether this is an Automake generated Makefile which includes
  705     # dependency-tracking related rules and includes.
  706     # Grep'ing the whole file directly is not great: AIX grep has a line
  707     # limit of 2048, but all sed's we know have understand at least 4000.
  708     sed -n 's,^am--depfiles:.*,X,p' "$am_mf" | grep X >/dev/null 2>&1 \
  709       || continue
  710     am_dirpart=`AS_DIRNAME(["$am_mf"])`
  711     am_filepart=`AS_BASENAME(["$am_mf"])`
  712     AM_RUN_LOG([cd "$am_dirpart" \
  713       && sed -e '/# am--include-marker/d' "$am_filepart" \
  714         | $MAKE -f - am--depfiles]) || am_rc=$?
  715   done
  716   if test $am_rc -ne 0; then
  717     AC_MSG_FAILURE([Something went wrong bootstrapping makefile fragments
  718     for automatic dependency tracking.  If GNU make was not used, consider
  719     re-running the configure script with MAKE="gmake" (or whatever is
  720     necessary).  You can also try re-running configure with the
  721     '--disable-dependency-tracking' option to at least be able to build
  722     the package (albeit without support for automatic dependency tracking).])
  723   fi
  724   AS_UNSET([am_dirpart])
  725   AS_UNSET([am_filepart])
  726   AS_UNSET([am_mf])
  727   AS_UNSET([am_rc])
  728   rm -f conftest-deps.mk
  729 }
  730 ])# _AM_OUTPUT_DEPENDENCY_COMMANDS
  731 
  732 
  733 # AM_OUTPUT_DEPENDENCY_COMMANDS
  734 # -----------------------------
  735 # This macro should only be invoked once -- use via AC_REQUIRE.
  736 #
  737 # This code is only required when automatic dependency tracking is enabled.
  738 # This creates each '.Po' and '.Plo' makefile fragment that we'll need in
  739 # order to bootstrap the dependency handling code.
  740 AC_DEFUN([AM_OUTPUT_DEPENDENCY_COMMANDS],
  741 [AC_CONFIG_COMMANDS([depfiles],
  742      [test x"$AMDEP_TRUE" != x"" || _AM_OUTPUT_DEPENDENCY_COMMANDS],
  743      [AMDEP_TRUE="$AMDEP_TRUE" MAKE="${MAKE-make}"])])
  744 
  745 # Do all the work for Automake.                             -*- Autoconf -*-
  746 
  747 # Copyright (C) 1996-2020 Free Software Foundation, Inc.
  748 #
  749 # This file is free software; the Free Software Foundation
  750 # gives unlimited permission to copy and/or distribute it,
  751 # with or without modifications, as long as this notice is preserved.
  752 
  753 # This macro actually does too much.  Some checks are only needed if
  754 # your package does certain things.  But this isn't really a big deal.
  755 
  756 dnl Redefine AC_PROG_CC to automatically invoke _AM_PROG_CC_C_O.
  757 m4_define([AC_PROG_CC],
  758 m4_defn([AC_PROG_CC])
  759 [_AM_PROG_CC_C_O
  760 ])
  761 
  762 # AM_INIT_AUTOMAKE(PACKAGE, VERSION, [NO-DEFINE])
  763 # AM_INIT_AUTOMAKE([OPTIONS])
  764 # -----------------------------------------------
  765 # The call with PACKAGE and VERSION arguments is the old style
  766 # call (pre autoconf-2.50), which is being phased out.  PACKAGE
  767 # and VERSION should now be passed to AC_INIT and removed from
  768 # the call to AM_INIT_AUTOMAKE.
  769 # We support both call styles for the transition.  After
  770 # the next Automake release, Autoconf can make the AC_INIT
  771 # arguments mandatory, and then we can depend on a new Autoconf
  772 # release and drop the old call support.
  773 AC_DEFUN([AM_INIT_AUTOMAKE],
  774 [AC_PREREQ([2.65])dnl
  775 dnl Autoconf wants to disallow AM_ names.  We explicitly allow
  776 dnl the ones we care about.
  777 m4_pattern_allow([^AM_[A-Z]+FLAGS$])dnl
  778 AC_REQUIRE([AM_SET_CURRENT_AUTOMAKE_VERSION])dnl
  779 AC_REQUIRE([AC_PROG_INSTALL])dnl
  780 if test "`cd $srcdir && pwd`" != "`pwd`"; then
  781   # Use -I$(srcdir) only when $(srcdir) != ., so that make's output
  782   # is not polluted with repeated "-I."
  783   AC_SUBST([am__isrc], [' -I$(srcdir)'])_AM_SUBST_NOTMAKE([am__isrc])dnl
  784   # test to see if srcdir already configured
  785   if test -f $srcdir/config.status; then
  786     AC_MSG_ERROR([source directory already configured; run "make distclean" there first])
  787   fi
  788 fi
  789 
  790 # test whether we have cygpath
  791 if test -z "$CYGPATH_W"; then
  792   if (cygpath --version) >/dev/null 2>/dev/null; then
  793     CYGPATH_W='cygpath -w'
  794   else
  795     CYGPATH_W=echo
  796   fi
  797 fi
  798 AC_SUBST([CYGPATH_W])
  799 
  800 # Define the identity of the package.
  801 dnl Distinguish between old-style and new-style calls.
  802 m4_ifval([$2],
  803 [AC_DIAGNOSE([obsolete],
  804              [$0: two- and three-arguments forms are deprecated.])
  805 m4_ifval([$3], [_AM_SET_OPTION([no-define])])dnl
  806  AC_SUBST([PACKAGE], [$1])dnl
  807  AC_SUBST([VERSION], [$2])],
  808 [_AM_SET_OPTIONS([$1])dnl
  809 dnl Diagnose old-style AC_INIT with new-style AM_AUTOMAKE_INIT.
  810 m4_if(
  811   m4_ifdef([AC_PACKAGE_NAME], [ok]):m4_ifdef([AC_PACKAGE_VERSION], [ok]),
  812   [ok:ok],,
  813   [m4_fatal([AC_INIT should be called with package and version arguments])])dnl
  814  AC_SUBST([PACKAGE], ['AC_PACKAGE_TARNAME'])dnl
  815  AC_SUBST([VERSION], ['AC_PACKAGE_VERSION'])])dnl
  816 
  817 _AM_IF_OPTION([no-define],,
  818 [AC_DEFINE_UNQUOTED([PACKAGE], ["$PACKAGE"], [Name of package])
  819  AC_DEFINE_UNQUOTED([VERSION], ["$VERSION"], [Version number of package])])dnl
  820 
  821 # Some tools Automake needs.
  822 AC_REQUIRE([AM_SANITY_CHECK])dnl
  823 AC_REQUIRE([AC_ARG_PROGRAM])dnl
  824 AM_MISSING_PROG([ACLOCAL], [aclocal-${am__api_version}])
  825 AM_MISSING_PROG([AUTOCONF], [autoconf])
  826 AM_MISSING_PROG([AUTOMAKE], [automake-${am__api_version}])
  827 AM_MISSING_PROG([AUTOHEADER], [autoheader])
  828 AM_MISSING_PROG([MAKEINFO], [makeinfo])
  829 AC_REQUIRE([AM_PROG_INSTALL_SH])dnl
  830 AC_REQUIRE([AM_PROG_INSTALL_STRIP])dnl
  831 AC_REQUIRE([AC_PROG_MKDIR_P])dnl
  832 # For better backward compatibility.  To be removed once Automake 1.9.x
  833 # dies out for good.  For more background, see:
  834 # <https://lists.gnu.org/archive/html/automake/2012-07/msg00001.html>
  835 # <https://lists.gnu.org/archive/html/automake/2012-07/msg00014.html>
  836 AC_SUBST([mkdir_p], ['$(MKDIR_P)'])
  837 # We need awk for the "check" target (and possibly the TAP driver).  The
  838 # system "awk" is bad on some platforms.
  839 AC_REQUIRE([AC_PROG_AWK])dnl
  840 AC_REQUIRE([AC_PROG_MAKE_SET])dnl
  841 AC_REQUIRE([AM_SET_LEADING_DOT])dnl
  842 _AM_IF_OPTION([tar-ustar], [_AM_PROG_TAR([ustar])],
  843 	      [_AM_IF_OPTION([tar-pax], [_AM_PROG_TAR([pax])],
  844 			     [_AM_PROG_TAR([v7])])])
  845 _AM_IF_OPTION([no-dependencies],,
  846 [AC_PROVIDE_IFELSE([AC_PROG_CC],
  847 		  [_AM_DEPENDENCIES([CC])],
  848 		  [m4_define([AC_PROG_CC],
  849 			     m4_defn([AC_PROG_CC])[_AM_DEPENDENCIES([CC])])])dnl
  850 AC_PROVIDE_IFELSE([AC_PROG_CXX],
  851 		  [_AM_DEPENDENCIES([CXX])],
  852 		  [m4_define([AC_PROG_CXX],
  853 			     m4_defn([AC_PROG_CXX])[_AM_DEPENDENCIES([CXX])])])dnl
  854 AC_PROVIDE_IFELSE([AC_PROG_OBJC],
  855 		  [_AM_DEPENDENCIES([OBJC])],
  856 		  [m4_define([AC_PROG_OBJC],
  857 			     m4_defn([AC_PROG_OBJC])[_AM_DEPENDENCIES([OBJC])])])dnl
  858 AC_PROVIDE_IFELSE([AC_PROG_OBJCXX],
  859 		  [_AM_DEPENDENCIES([OBJCXX])],
  860 		  [m4_define([AC_PROG_OBJCXX],
  861 			     m4_defn([AC_PROG_OBJCXX])[_AM_DEPENDENCIES([OBJCXX])])])dnl
  862 ])
  863 AC_REQUIRE([AM_SILENT_RULES])dnl
  864 dnl The testsuite driver may need to know about EXEEXT, so add the
  865 dnl 'am__EXEEXT' conditional if _AM_COMPILER_EXEEXT was seen.  This
  866 dnl macro is hooked onto _AC_COMPILER_EXEEXT early, see below.
  867 AC_CONFIG_COMMANDS_PRE(dnl
  868 [m4_provide_if([_AM_COMPILER_EXEEXT],
  869   [AM_CONDITIONAL([am__EXEEXT], [test -n "$EXEEXT"])])])dnl
  870 
  871 # POSIX will say in a future version that running "rm -f" with no argument
  872 # is OK; and we want to be able to make that assumption in our Makefile
  873 # recipes.  So use an aggressive probe to check that the usage we want is
  874 # actually supported "in the wild" to an acceptable degree.
  875 # See automake bug#10828.
  876 # To make any issue more visible, cause the running configure to be aborted
  877 # by default if the 'rm' program in use doesn't match our expectations; the
  878 # user can still override this though.
  879 if rm -f && rm -fr && rm -rf; then : OK; else
  880   cat >&2 <<'END'
  881 Oops!
  882 
  883 Your 'rm' program seems unable to run without file operands specified
  884 on the command line, even when the '-f' option is present.  This is contrary
  885 to the behaviour of most rm programs out there, and not conforming with
  886 the upcoming POSIX standard: <http://austingroupbugs.net/view.php?id=542>
  887 
  888 Please tell bug-automake@gnu.org about your system, including the value
  889 of your $PATH and any error possibly output before this message.  This
  890 can help us improve future automake versions.
  891 
  892 END
  893   if test x"$ACCEPT_INFERIOR_RM_PROGRAM" = x"yes"; then
  894     echo 'Configuration will proceed anyway, since you have set the' >&2
  895     echo 'ACCEPT_INFERIOR_RM_PROGRAM variable to "yes"' >&2
  896     echo >&2
  897   else
  898     cat >&2 <<'END'
  899 Aborting the configuration process, to ensure you take notice of the issue.
  900 
  901 You can download and install GNU coreutils to get an 'rm' implementation
  902 that behaves properly: <https://www.gnu.org/software/coreutils/>.
  903 
  904 If you want to complete the configuration process using your problematic
  905 'rm' anyway, export the environment variable ACCEPT_INFERIOR_RM_PROGRAM
  906 to "yes", and re-run configure.
  907 
  908 END
  909     AC_MSG_ERROR([Your 'rm' program is bad, sorry.])
  910   fi
  911 fi
  912 dnl The trailing newline in this macro's definition is deliberate, for
  913 dnl backward compatibility and to allow trailing 'dnl'-style comments
  914 dnl after the AM_INIT_AUTOMAKE invocation. See automake bug#16841.
  915 ])
  916 
  917 dnl Hook into '_AC_COMPILER_EXEEXT' early to learn its expansion.  Do not
  918 dnl add the conditional right here, as _AC_COMPILER_EXEEXT may be further
  919 dnl mangled by Autoconf and run in a shell conditional statement.
  920 m4_define([_AC_COMPILER_EXEEXT],
  921 m4_defn([_AC_COMPILER_EXEEXT])[m4_provide([_AM_COMPILER_EXEEXT])])
  922 
  923 # When config.status generates a header, we must update the stamp-h file.
  924 # This file resides in the same directory as the config header
  925 # that is generated.  The stamp files are numbered to have different names.
  926 
  927 # Autoconf calls _AC_AM_CONFIG_HEADER_HOOK (when defined) in the
  928 # loop where config.status creates the headers, so we can generate
  929 # our stamp files there.
  930 AC_DEFUN([_AC_AM_CONFIG_HEADER_HOOK],
  931 [# Compute $1's index in $config_headers.
  932 _am_arg=$1
  933 _am_stamp_count=1
  934 for _am_header in $config_headers :; do
  935   case $_am_header in
  936     $_am_arg | $_am_arg:* )
  937       break ;;
  938     * )
  939       _am_stamp_count=`expr $_am_stamp_count + 1` ;;
  940   esac
  941 done
  942 echo "timestamp for $_am_arg" >`AS_DIRNAME(["$_am_arg"])`/stamp-h[]$_am_stamp_count])
  943 
  944 # Copyright (C) 2001-2020 Free Software Foundation, Inc.
  945 #
  946 # This file is free software; the Free Software Foundation
  947 # gives unlimited permission to copy and/or distribute it,
  948 # with or without modifications, as long as this notice is preserved.
  949 
  950 # AM_PROG_INSTALL_SH
  951 # ------------------
  952 # Define $install_sh.
  953 AC_DEFUN([AM_PROG_INSTALL_SH],
  954 [AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
  955 if test x"${install_sh+set}" != xset; then
  956   case $am_aux_dir in
  957   *\ * | *\	*)
  958     install_sh="\${SHELL} '$am_aux_dir/install-sh'" ;;
  959   *)
  960     install_sh="\${SHELL} $am_aux_dir/install-sh"
  961   esac
  962 fi
  963 AC_SUBST([install_sh])])
  964 
  965 # Copyright (C) 2003-2020 Free Software Foundation, Inc.
  966 #
  967 # This file is free software; the Free Software Foundation
  968 # gives unlimited permission to copy and/or distribute it,
  969 # with or without modifications, as long as this notice is preserved.
  970 
  971 # Check whether the underlying file-system supports filenames
  972 # with a leading dot.  For instance MS-DOS doesn't.
  973 AC_DEFUN([AM_SET_LEADING_DOT],
  974 [rm -rf .tst 2>/dev/null
  975 mkdir .tst 2>/dev/null
  976 if test -d .tst; then
  977   am__leading_dot=.
  978 else
  979   am__leading_dot=_
  980 fi
  981 rmdir .tst 2>/dev/null
  982 AC_SUBST([am__leading_dot])])
  983 
  984 # Check to see how 'make' treats includes.	            -*- Autoconf -*-
  985 
  986 # Copyright (C) 2001-2020 Free Software Foundation, Inc.
  987 #
  988 # This file is free software; the Free Software Foundation
  989 # gives unlimited permission to copy and/or distribute it,
  990 # with or without modifications, as long as this notice is preserved.
  991 
  992 # AM_MAKE_INCLUDE()
  993 # -----------------
  994 # Check whether make has an 'include' directive that can support all
  995 # the idioms we need for our automatic dependency tracking code.
  996 AC_DEFUN([AM_MAKE_INCLUDE],
  997 [AC_MSG_CHECKING([whether ${MAKE-make} supports the include directive])
  998 cat > confinc.mk << 'END'
  999 am__doit:
 1000 	@echo this is the am__doit target >confinc.out
 1001 .PHONY: am__doit
 1002 END
 1003 am__include="#"
 1004 am__quote=
 1005 # BSD make does it like this.
 1006 echo '.include "confinc.mk" # ignored' > confmf.BSD
 1007 # Other make implementations (GNU, Solaris 10, AIX) do it like this.
 1008 echo 'include confinc.mk # ignored' > confmf.GNU
 1009 _am_result=no
 1010 for s in GNU BSD; do
 1011   AM_RUN_LOG([${MAKE-make} -f confmf.$s && cat confinc.out])
 1012   AS_CASE([$?:`cat confinc.out 2>/dev/null`],
 1013       ['0:this is the am__doit target'],
 1014       [AS_CASE([$s],
 1015           [BSD], [am__include='.include' am__quote='"'],
 1016           [am__include='include' am__quote=''])])
 1017   if test "$am__include" != "#"; then
 1018     _am_result="yes ($s style)"
 1019     break
 1020   fi
 1021 done
 1022 rm -f confinc.* confmf.*
 1023 AC_MSG_RESULT([${_am_result}])
 1024 AC_SUBST([am__include])])
 1025 AC_SUBST([am__quote])])
 1026 
 1027 # Fake the existence of programs that GNU maintainers use.  -*- Autoconf -*-
 1028 
 1029 # Copyright (C) 1997-2020 Free Software Foundation, Inc.
 1030 #
 1031 # This file is free software; the Free Software Foundation
 1032 # gives unlimited permission to copy and/or distribute it,
 1033 # with or without modifications, as long as this notice is preserved.
 1034 
 1035 # AM_MISSING_PROG(NAME, PROGRAM)
 1036 # ------------------------------
 1037 AC_DEFUN([AM_MISSING_PROG],
 1038 [AC_REQUIRE([AM_MISSING_HAS_RUN])
 1039 $1=${$1-"${am_missing_run}$2"}
 1040 AC_SUBST($1)])
 1041 
 1042 # AM_MISSING_HAS_RUN
 1043 # ------------------
 1044 # Define MISSING if not defined so far and test if it is modern enough.
 1045 # If it is, set am_missing_run to use it, otherwise, to nothing.
 1046 AC_DEFUN([AM_MISSING_HAS_RUN],
 1047 [AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
 1048 AC_REQUIRE_AUX_FILE([missing])dnl
 1049 if test x"${MISSING+set}" != xset; then
 1050   MISSING="\${SHELL} '$am_aux_dir/missing'"
 1051 fi
 1052 # Use eval to expand $SHELL
 1053 if eval "$MISSING --is-lightweight"; then
 1054   am_missing_run="$MISSING "
 1055 else
 1056   am_missing_run=
 1057   AC_MSG_WARN(['missing' script is too old or missing])
 1058 fi
 1059 ])
 1060 
 1061 # Helper functions for option handling.                     -*- Autoconf -*-
 1062 
 1063 # Copyright (C) 2001-2020 Free Software Foundation, Inc.
 1064 #
 1065 # This file is free software; the Free Software Foundation
 1066 # gives unlimited permission to copy and/or distribute it,
 1067 # with or without modifications, as long as this notice is preserved.
 1068 
 1069 # _AM_MANGLE_OPTION(NAME)
 1070 # -----------------------
 1071 AC_DEFUN([_AM_MANGLE_OPTION],
 1072 [[_AM_OPTION_]m4_bpatsubst($1, [[^a-zA-Z0-9_]], [_])])
 1073 
 1074 # _AM_SET_OPTION(NAME)
 1075 # --------------------
 1076 # Set option NAME.  Presently that only means defining a flag for this option.
 1077 AC_DEFUN([_AM_SET_OPTION],
 1078 [m4_define(_AM_MANGLE_OPTION([$1]), [1])])
 1079 
 1080 # _AM_SET_OPTIONS(OPTIONS)
 1081 # ------------------------
 1082 # OPTIONS is a space-separated list of Automake options.
 1083 AC_DEFUN([_AM_SET_OPTIONS],
 1084 [m4_foreach_w([_AM_Option], [$1], [_AM_SET_OPTION(_AM_Option)])])
 1085 
 1086 # _AM_IF_OPTION(OPTION, IF-SET, [IF-NOT-SET])
 1087 # -------------------------------------------
 1088 # Execute IF-SET if OPTION is set, IF-NOT-SET otherwise.
 1089 AC_DEFUN([_AM_IF_OPTION],
 1090 [m4_ifset(_AM_MANGLE_OPTION([$1]), [$2], [$3])])
 1091 
 1092 # Copyright (C) 1999-2020 Free Software Foundation, Inc.
 1093 #
 1094 # This file is free software; the Free Software Foundation
 1095 # gives unlimited permission to copy and/or distribute it,
 1096 # with or without modifications, as long as this notice is preserved.
 1097 
 1098 # _AM_PROG_CC_C_O
 1099 # ---------------
 1100 # Like AC_PROG_CC_C_O, but changed for automake.  We rewrite AC_PROG_CC
 1101 # to automatically call this.
 1102 AC_DEFUN([_AM_PROG_CC_C_O],
 1103 [AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
 1104 AC_REQUIRE_AUX_FILE([compile])dnl
 1105 AC_LANG_PUSH([C])dnl
 1106 AC_CACHE_CHECK(
 1107   [whether $CC understands -c and -o together],
 1108   [am_cv_prog_cc_c_o],
 1109   [AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
 1110   # Make sure it works both with $CC and with simple cc.
 1111   # Following AC_PROG_CC_C_O, we do the test twice because some
 1112   # compilers refuse to overwrite an existing .o file with -o,
 1113   # though they will create one.
 1114   am_cv_prog_cc_c_o=yes
 1115   for am_i in 1 2; do
 1116     if AM_RUN_LOG([$CC -c conftest.$ac_ext -o conftest2.$ac_objext]) \
 1117          && test -f conftest2.$ac_objext; then
 1118       : OK
 1119     else
 1120       am_cv_prog_cc_c_o=no
 1121       break
 1122     fi
 1123   done
 1124   rm -f core conftest*
 1125   unset am_i])
 1126 if test "$am_cv_prog_cc_c_o" != yes; then
 1127    # Losing compiler, so override with the script.
 1128    # FIXME: It is wrong to rewrite CC.
 1129    # But if we don't then we get into trouble of one sort or another.
 1130    # A longer-term fix would be to have automake use am__CC in this case,
 1131    # and then we could set am__CC="\$(top_srcdir)/compile \$(CC)"
 1132    CC="$am_aux_dir/compile $CC"
 1133 fi
 1134 AC_LANG_POP([C])])
 1135 
 1136 # For backward compatibility.
 1137 AC_DEFUN_ONCE([AM_PROG_CC_C_O], [AC_REQUIRE([AC_PROG_CC])])
 1138 
 1139 # Copyright (C) 2001-2020 Free Software Foundation, Inc.
 1140 #
 1141 # This file is free software; the Free Software Foundation
 1142 # gives unlimited permission to copy and/or distribute it,
 1143 # with or without modifications, as long as this notice is preserved.
 1144 
 1145 # AM_RUN_LOG(COMMAND)
 1146 # -------------------
 1147 # Run COMMAND, save the exit status in ac_status, and log it.
 1148 # (This has been adapted from Autoconf's _AC_RUN_LOG macro.)
 1149 AC_DEFUN([AM_RUN_LOG],
 1150 [{ echo "$as_me:$LINENO: $1" >&AS_MESSAGE_LOG_FD
 1151    ($1) >&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD
 1152    ac_status=$?
 1153    echo "$as_me:$LINENO: \$? = $ac_status" >&AS_MESSAGE_LOG_FD
 1154    (exit $ac_status); }])
 1155 
 1156 # Check to make sure that the build environment is sane.    -*- Autoconf -*-
 1157 
 1158 # Copyright (C) 1996-2020 Free Software Foundation, Inc.
 1159 #
 1160 # This file is free software; the Free Software Foundation
 1161 # gives unlimited permission to copy and/or distribute it,
 1162 # with or without modifications, as long as this notice is preserved.
 1163 
 1164 # AM_SANITY_CHECK
 1165 # ---------------
 1166 AC_DEFUN([AM_SANITY_CHECK],
 1167 [AC_MSG_CHECKING([whether build environment is sane])
 1168 # Reject unsafe characters in $srcdir or the absolute working directory
 1169 # name.  Accept space and tab only in the latter.
 1170 am_lf='
 1171 '
 1172 case `pwd` in
 1173   *[[\\\"\#\$\&\'\`$am_lf]]*)
 1174     AC_MSG_ERROR([unsafe absolute working directory name]);;
 1175 esac
 1176 case $srcdir in
 1177   *[[\\\"\#\$\&\'\`$am_lf\ \	]]*)
 1178     AC_MSG_ERROR([unsafe srcdir value: '$srcdir']);;
 1179 esac
 1180 
 1181 # Do 'set' in a subshell so we don't clobber the current shell's
 1182 # arguments.  Must try -L first in case configure is actually a
 1183 # symlink; some systems play weird games with the mod time of symlinks
 1184 # (eg FreeBSD returns the mod time of the symlink's containing
 1185 # directory).
 1186 if (
 1187    am_has_slept=no
 1188    for am_try in 1 2; do
 1189      echo "timestamp, slept: $am_has_slept" > conftest.file
 1190      set X `ls -Lt "$srcdir/configure" conftest.file 2> /dev/null`
 1191      if test "$[*]" = "X"; then
 1192 	# -L didn't work.
 1193 	set X `ls -t "$srcdir/configure" conftest.file`
 1194      fi
 1195      if test "$[*]" != "X $srcdir/configure conftest.file" \
 1196 	&& test "$[*]" != "X conftest.file $srcdir/configure"; then
 1197 
 1198 	# If neither matched, then we have a broken ls.  This can happen
 1199 	# if, for instance, CONFIG_SHELL is bash and it inherits a
 1200 	# broken ls alias from the environment.  This has actually
 1201 	# happened.  Such a system could not be considered "sane".
 1202 	AC_MSG_ERROR([ls -t appears to fail.  Make sure there is not a broken
 1203   alias in your environment])
 1204      fi
 1205      if test "$[2]" = conftest.file || test $am_try -eq 2; then
 1206        break
 1207      fi
 1208      # Just in case.
 1209      sleep 1
 1210      am_has_slept=yes
 1211    done
 1212    test "$[2]" = conftest.file
 1213    )
 1214 then
 1215    # Ok.
 1216    :
 1217 else
 1218    AC_MSG_ERROR([newly created file is older than distributed files!
 1219 Check your system clock])
 1220 fi
 1221 AC_MSG_RESULT([yes])
 1222 # If we didn't sleep, we still need to ensure time stamps of config.status and
 1223 # generated files are strictly newer.
 1224 am_sleep_pid=
 1225 if grep 'slept: no' conftest.file >/dev/null 2>&1; then
 1226   ( sleep 1 ) &
 1227   am_sleep_pid=$!
 1228 fi
 1229 AC_CONFIG_COMMANDS_PRE(
 1230   [AC_MSG_CHECKING([that generated files are newer than configure])
 1231    if test -n "$am_sleep_pid"; then
 1232      # Hide warnings about reused PIDs.
 1233      wait $am_sleep_pid 2>/dev/null
 1234    fi
 1235    AC_MSG_RESULT([done])])
 1236 rm -f conftest.file
 1237 ])
 1238 
 1239 # Copyright (C) 2009-2020 Free Software Foundation, Inc.
 1240 #
 1241 # This file is free software; the Free Software Foundation
 1242 # gives unlimited permission to copy and/or distribute it,
 1243 # with or without modifications, as long as this notice is preserved.
 1244 
 1245 # AM_SILENT_RULES([DEFAULT])
 1246 # --------------------------
 1247 # Enable less verbose build rules; with the default set to DEFAULT
 1248 # ("yes" being less verbose, "no" or empty being verbose).
 1249 AC_DEFUN([AM_SILENT_RULES],
 1250 [AC_ARG_ENABLE([silent-rules], [dnl
 1251 AS_HELP_STRING(
 1252   [--enable-silent-rules],
 1253   [less verbose build output (undo: "make V=1")])
 1254 AS_HELP_STRING(
 1255   [--disable-silent-rules],
 1256   [verbose build output (undo: "make V=0")])dnl
 1257 ])
 1258 case $enable_silent_rules in @%:@ (((
 1259   yes) AM_DEFAULT_VERBOSITY=0;;
 1260    no) AM_DEFAULT_VERBOSITY=1;;
 1261     *) AM_DEFAULT_VERBOSITY=m4_if([$1], [yes], [0], [1]);;
 1262 esac
 1263 dnl
 1264 dnl A few 'make' implementations (e.g., NonStop OS and NextStep)
 1265 dnl do not support nested variable expansions.
 1266 dnl See automake bug#9928 and bug#10237.
 1267 am_make=${MAKE-make}
 1268 AC_CACHE_CHECK([whether $am_make supports nested variables],
 1269    [am_cv_make_support_nested_variables],
 1270    [if AS_ECHO([['TRUE=$(BAR$(V))
 1271 BAR0=false
 1272 BAR1=true
 1273 V=1
 1274 am__doit:
 1275 	@$(TRUE)
 1276 .PHONY: am__doit']]) | $am_make -f - >/dev/null 2>&1; then
 1277   am_cv_make_support_nested_variables=yes
 1278 else
 1279   am_cv_make_support_nested_variables=no
 1280 fi])
 1281 if test $am_cv_make_support_nested_variables = yes; then
 1282   dnl Using '$V' instead of '$(V)' breaks IRIX make.
 1283   AM_V='$(V)'
 1284   AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'
 1285 else
 1286   AM_V=$AM_DEFAULT_VERBOSITY
 1287   AM_DEFAULT_V=$AM_DEFAULT_VERBOSITY
 1288 fi
 1289 AC_SUBST([AM_V])dnl
 1290 AM_SUBST_NOTMAKE([AM_V])dnl
 1291 AC_SUBST([AM_DEFAULT_V])dnl
 1292 AM_SUBST_NOTMAKE([AM_DEFAULT_V])dnl
 1293 AC_SUBST([AM_DEFAULT_VERBOSITY])dnl
 1294 AM_BACKSLASH='\'
 1295 AC_SUBST([AM_BACKSLASH])dnl
 1296 _AM_SUBST_NOTMAKE([AM_BACKSLASH])dnl
 1297 ])
 1298 
 1299 # Copyright (C) 2001-2020 Free Software Foundation, Inc.
 1300 #
 1301 # This file is free software; the Free Software Foundation
 1302 # gives unlimited permission to copy and/or distribute it,
 1303 # with or without modifications, as long as this notice is preserved.
 1304 
 1305 # AM_PROG_INSTALL_STRIP
 1306 # ---------------------
 1307 # One issue with vendor 'install' (even GNU) is that you can't
 1308 # specify the program used to strip binaries.  This is especially
 1309 # annoying in cross-compiling environments, where the build's strip
 1310 # is unlikely to handle the host's binaries.
 1311 # Fortunately install-sh will honor a STRIPPROG variable, so we
 1312 # always use install-sh in "make install-strip", and initialize
 1313 # STRIPPROG with the value of the STRIP variable (set by the user).
 1314 AC_DEFUN([AM_PROG_INSTALL_STRIP],
 1315 [AC_REQUIRE([AM_PROG_INSTALL_SH])dnl
 1316 # Installed binaries are usually stripped using 'strip' when the user
 1317 # run "make install-strip".  However 'strip' might not be the right
 1318 # tool to use in cross-compilation environments, therefore Automake
 1319 # will honor the 'STRIP' environment variable to overrule this program.
 1320 dnl Don't test for $cross_compiling = yes, because it might be 'maybe'.
 1321 if test "$cross_compiling" != no; then
 1322   AC_CHECK_TOOL([STRIP], [strip], :)
 1323 fi
 1324 INSTALL_STRIP_PROGRAM="\$(install_sh) -c -s"
 1325 AC_SUBST([INSTALL_STRIP_PROGRAM])])
 1326 
 1327 # Copyright (C) 2006-2020 Free Software Foundation, Inc.
 1328 #
 1329 # This file is free software; the Free Software Foundation
 1330 # gives unlimited permission to copy and/or distribute it,
 1331 # with or without modifications, as long as this notice is preserved.
 1332 
 1333 # _AM_SUBST_NOTMAKE(VARIABLE)
 1334 # ---------------------------
 1335 # Prevent Automake from outputting VARIABLE = @VARIABLE@ in Makefile.in.
 1336 # This macro is traced by Automake.
 1337 AC_DEFUN([_AM_SUBST_NOTMAKE])
 1338 
 1339 # AM_SUBST_NOTMAKE(VARIABLE)
 1340 # --------------------------
 1341 # Public sister of _AM_SUBST_NOTMAKE.
 1342 AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])
 1343 
 1344 # Check how to create a tarball.                            -*- Autoconf -*-
 1345 
 1346 # Copyright (C) 2004-2020 Free Software Foundation, Inc.
 1347 #
 1348 # This file is free software; the Free Software Foundation
 1349 # gives unlimited permission to copy and/or distribute it,
 1350 # with or without modifications, as long as this notice is preserved.
 1351 
 1352 # _AM_PROG_TAR(FORMAT)
 1353 # --------------------
 1354 # Check how to create a tarball in format FORMAT.
 1355 # FORMAT should be one of 'v7', 'ustar', or 'pax'.
 1356 #
 1357 # Substitute a variable $(am__tar) that is a command
 1358 # writing to stdout a FORMAT-tarball containing the directory
 1359 # $tardir.
 1360 #     tardir=directory && $(am__tar) > result.tar
 1361 #
 1362 # Substitute a variable $(am__untar) that extract such
 1363 # a tarball read from stdin.
 1364 #     $(am__untar) < result.tar
 1365 #
 1366 AC_DEFUN([_AM_PROG_TAR],
 1367 [# Always define AMTAR for backward compatibility.  Yes, it's still used
 1368 # in the wild :-(  We should find a proper way to deprecate it ...
 1369 AC_SUBST([AMTAR], ['$${TAR-tar}'])
 1370 
 1371 # We'll loop over all known methods to create a tar archive until one works.
 1372 _am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'
 1373 
 1374 m4_if([$1], [v7],
 1375   [am__tar='$${TAR-tar} chof - "$$tardir"' am__untar='$${TAR-tar} xf -'],
 1376 
 1377   [m4_case([$1],
 1378     [ustar],
 1379      [# The POSIX 1988 'ustar' format is defined with fixed-size fields.
 1380       # There is notably a 21 bits limit for the UID and the GID.  In fact,
 1381       # the 'pax' utility can hang on bigger UID/GID (see automake bug#8343
 1382       # and bug#13588).
 1383       am_max_uid=2097151 # 2^21 - 1
 1384       am_max_gid=$am_max_uid
 1385       # The $UID and $GID variables are not portable, so we need to resort
 1386       # to the POSIX-mandated id(1) utility.  Errors in the 'id' calls
 1387       # below are definitely unexpected, so allow the users to see them
 1388       # (that is, avoid stderr redirection).
 1389       am_uid=`id -u || echo unknown`
 1390       am_gid=`id -g || echo unknown`
 1391       AC_MSG_CHECKING([whether UID '$am_uid' is supported by ustar format])
 1392       if test $am_uid -le $am_max_uid; then
 1393          AC_MSG_RESULT([yes])
 1394       else
 1395          AC_MSG_RESULT([no])
 1396          _am_tools=none
 1397       fi
 1398       AC_MSG_CHECKING([whether GID '$am_gid' is supported by ustar format])
 1399       if test $am_gid -le $am_max_gid; then
 1400          AC_MSG_RESULT([yes])
 1401       else
 1402         AC_MSG_RESULT([no])
 1403         _am_tools=none
 1404       fi],
 1405 
 1406   [pax],
 1407     [],
 1408 
 1409   [m4_fatal([Unknown tar format])])
 1410 
 1411   AC_MSG_CHECKING([how to create a $1 tar archive])
 1412 
 1413   # Go ahead even if we have the value already cached.  We do so because we
 1414   # need to set the values for the 'am__tar' and 'am__untar' variables.
 1415   _am_tools=${am_cv_prog_tar_$1-$_am_tools}
 1416 
 1417   for _am_tool in $_am_tools; do
 1418     case $_am_tool in
 1419     gnutar)
 1420       for _am_tar in tar gnutar gtar; do
 1421         AM_RUN_LOG([$_am_tar --version]) && break
 1422       done
 1423       am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"'
 1424       am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"'
 1425       am__untar="$_am_tar -xf -"
 1426       ;;
 1427     plaintar)
 1428       # Must skip GNU tar: if it does not support --format= it doesn't create
 1429       # ustar tarball either.
 1430       (tar --version) >/dev/null 2>&1 && continue
 1431       am__tar='tar chf - "$$tardir"'
 1432       am__tar_='tar chf - "$tardir"'
 1433       am__untar='tar xf -'
 1434       ;;
 1435     pax)
 1436       am__tar='pax -L -x $1 -w "$$tardir"'
 1437       am__tar_='pax -L -x $1 -w "$tardir"'
 1438       am__untar='pax -r'
 1439       ;;
 1440     cpio)
 1441       am__tar='find "$$tardir" -print | cpio -o -H $1 -L'
 1442       am__tar_='find "$tardir" -print | cpio -o -H $1 -L'
 1443       am__untar='cpio -i -H $1 -d'
 1444       ;;
 1445     none)
 1446       am__tar=false
 1447       am__tar_=false
 1448       am__untar=false
 1449       ;;
 1450     esac
 1451 
 1452     # If the value was cached, stop now.  We just wanted to have am__tar
 1453     # and am__untar set.
 1454     test -n "${am_cv_prog_tar_$1}" && break
 1455 
 1456     # tar/untar a dummy directory, and stop if the command works.
 1457     rm -rf conftest.dir
 1458     mkdir conftest.dir
 1459     echo GrepMe > conftest.dir/file
 1460     AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar])
 1461     rm -rf conftest.dir
 1462     if test -s conftest.tar; then
 1463       AM_RUN_LOG([$am__untar <conftest.tar])
 1464       AM_RUN_LOG([cat conftest.dir/file])
 1465       grep GrepMe conftest.dir/file >/dev/null 2>&1 && break
 1466     fi
 1467   done
 1468   rm -rf conftest.dir
 1469 
 1470   AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])
 1471   AC_MSG_RESULT([$am_cv_prog_tar_$1])])
 1472 
 1473 AC_SUBST([am__tar])
 1474 AC_SUBST([am__untar])
 1475 ]) # _AM_PROG_TAR
 1476