aclocal.m4 - platform/external/python/cpython3 - Gitiles

 # generated automatically by aclocal 1.16.2 -*- Autoconf -*-

 # Copyright (C) 1996-2020 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.

 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY, to the extent permitted by law; without
 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 # PARTICULAR PURPOSE.

 m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
 # ===========================================================================
 #  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
 #   Check whether the given FLAG works with the current language's compiler
 #   or gives an error.  (Warnings, however, are ignored)
 #
 #   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
 #   success/failure.
 #
 #   If EXTRA-FLAGS is defined, it is added to the current language's default
 #   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
 #   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
 #   force the compiler to issue an error when a bad flag is given.
 #
 #   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
 #
 #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
 #   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
 #
 # LICENSE
 #
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
 #
 #   Copying and distribution of this file, with or without modification, are
 #   permitted in any medium without royalty provided the copyright notice
 #   and this notice are preserved.  This file is offered as-is, without any
 #   warranty.

 #serial 6

 AC_DEFUN([AX_CHECK_COMPILE_FLAG],
 [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
 AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
   ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
   _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
   AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
     [AS_VAR_SET(CACHEVAR,[yes])],
     [AS_VAR_SET(CACHEVAR,[no])])
   _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
 AS_VAR_IF(CACHEVAR,yes,
   [m4_default([$2], :)],
   [m4_default([$3], :)])
 AS_VAR_POPDEF([CACHEVAR])dnl
 ])dnl AX_CHECK_COMPILE_FLAGS

 # pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
 # serial 11 (pkg-config-0.29.1)

 dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
 dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
 dnl
 dnl This program is free software; you can redistribute it and/or modify
 dnl it under the terms of the GNU General Public License as published by
 dnl the Free Software Foundation; either version 2 of the License, or
 dnl (at your option) any later version.
 dnl
 dnl This program is distributed in the hope that it will be useful, but
 dnl WITHOUT ANY WARRANTY; without even the implied warranty of
 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 dnl General Public License for more details.
 dnl
 dnl You should have received a copy of the GNU General Public License
 dnl along with this program; if not, write to the Free Software
 dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 dnl 02111-1307, USA.
 dnl
 dnl As a special exception to the GNU General Public License, if you
 dnl distribute this file as part of a program that contains a
 dnl configuration script generated by Autoconf, you may include it under
 dnl the same distribution terms that you use for the rest of that
 dnl program.

 dnl PKG_PREREQ(MIN-VERSION)
 dnl -----------------------
 dnl Since: 0.29
 dnl
 dnl Verify that the version of the pkg-config macros are at least
 dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's
 dnl installed version of pkg-config, this checks the developer's version
 dnl of pkg.m4 when generating configure.
 dnl
 dnl To ensure that this macro is defined, also add:
 dnl m4_ifndef([PKG_PREREQ],
 dnl     [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])])
 dnl
 dnl See the "Since" comment for each macro you use to see what version
 dnl of the macros you require.
 m4_defun([PKG_PREREQ],
 [m4_define([PKG_MACROS_VERSION], [0.29.1])
 m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
     [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
 ])dnl PKG_PREREQ

 dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
 dnl ----------------------------------
 dnl Since: 0.16
 dnl
 dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
 dnl first found in the path. Checks that the version of pkg-config found
 dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
 dnl used since that's the first version where most current features of
 dnl pkg-config existed.
 AC_DEFUN([PKG_PROG_PKG_CONFIG],
 [m4_pattern_forbid([^_?PKG_[A-Z_]+$])
 m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
 m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$])
 AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
 AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
 AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path])

 if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
 	AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
 fi
 if test -n "$PKG_CONFIG"; then
 	_pkg_min_version=m4_default([$1], [0.9.0])
 	AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
 	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
 		AC_MSG_RESULT([yes])
 	else
 		AC_MSG_RESULT([no])
 		PKG_CONFIG=""
 	fi
 fi[]dnl
 ])dnl PKG_PROG_PKG_CONFIG

 dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
 dnl -------------------------------------------------------------------
 dnl Since: 0.18
 dnl
 dnl Check to see whether a particular set of modules exists. Similar to
 dnl PKG_CHECK_MODULES(), but does not set variables or print errors.
 dnl
 dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
 dnl only at the first occurence in configure.ac, so if the first place
 dnl it's called might be skipped (such as if it is within an "if", you
 dnl have to call PKG_CHECK_EXISTS manually
 AC_DEFUN([PKG_CHECK_EXISTS],
 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
 if test -n "$PKG_CONFIG" && \
     AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
   m4_default([$2], [:])
 m4_ifvaln([$3], [else
   $3])dnl
 fi])

 dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
 dnl ---------------------------------------------
 dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting
 dnl pkg_failed based on the result.
 m4_define([_PKG_CONFIG],
 [if test -n "$$1"; then
     pkg_cv_[]$1="$$1"
  elif test -n "$PKG_CONFIG"; then
     PKG_CHECK_EXISTS([$3],
                      [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes ],
 		     [pkg_failed=yes])
  else
     pkg_failed=untried
 fi[]dnl
 ])dnl _PKG_CONFIG

 dnl _PKG_SHORT_ERRORS_SUPPORTED
 dnl ---------------------------
 dnl Internal check to see if pkg-config supports short errors.
 AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])
 if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
         _pkg_short_errors_supported=yes
 else
         _pkg_short_errors_supported=no
 fi[]dnl
 ])dnl _PKG_SHORT_ERRORS_SUPPORTED


 dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
 dnl   [ACTION-IF-NOT-FOUND])
 dnl --------------------------------------------------------------
 dnl Since: 0.4.0
 dnl
 dnl Note that if there is a possibility the first call to
 dnl PKG_CHECK_MODULES might not happen, you should be sure to include an
 dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
 AC_DEFUN([PKG_CHECK_MODULES],
 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
 AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
 AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl

 pkg_failed=no
 AC_MSG_CHECKING([for $1])

 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
 _PKG_CONFIG([$1][_LIBS], [libs], [$2])

 m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
 and $1[]_LIBS to avoid the need to call pkg-config.
 See the pkg-config man page for more details.])

 if test $pkg_failed = yes; then
    	AC_MSG_RESULT([no])
         _PKG_SHORT_ERRORS_SUPPORTED
         if test $_pkg_short_errors_supported = yes; then
 	        $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
         else
 	        $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
         fi
 	# Put the nasty error message in config.log where it belongs
 	echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD

 	m4_default([$4], [AC_MSG_ERROR(
 [Package requirements ($2) were not met:

 $$1_PKG_ERRORS

 Consider adjusting the PKG_CONFIG_PATH environment variable if you
 installed software in a non-standard prefix.

 _PKG_TEXT])[]dnl
         ])
 elif test $pkg_failed = untried; then
      	AC_MSG_RESULT([no])
 	m4_default([$4], [AC_MSG_FAILURE(
 [The pkg-config script could not be found or is too old.  Make sure it
 is in your PATH or set the PKG_CONFIG environment variable to the full
 path to pkg-config.

 _PKG_TEXT

 To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
         ])
 else
 	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
 	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS
         AC_MSG_RESULT([yes])
 	$3
 fi[]dnl
 ])dnl PKG_CHECK_MODULES


 dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
 dnl   [ACTION-IF-NOT-FOUND])
 dnl ---------------------------------------------------------------------
 dnl Since: 0.29
 dnl
 dnl Checks for existence of MODULES and gathers its build flags with
 dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags
 dnl and VARIABLE-PREFIX_LIBS from --libs.
 dnl
 dnl Note that if there is a possibility the first call to
 dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to
 dnl include an explicit call to PKG_PROG_PKG_CONFIG in your
 dnl configure.ac.
 AC_DEFUN([PKG_CHECK_MODULES_STATIC],
 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
 _save_PKG_CONFIG=$PKG_CONFIG
 PKG_CONFIG="$PKG_CONFIG --static"
 PKG_CHECK_MODULES($@)
 PKG_CONFIG=$_save_PKG_CONFIG[]dnl
 ])dnl PKG_CHECK_MODULES_STATIC


 dnl PKG_INSTALLDIR([DIRECTORY])
 dnl -------------------------
 dnl Since: 0.27
 dnl
 dnl Substitutes the variable pkgconfigdir as the location where a module
 dnl should install pkg-config .pc files. By default the directory is
 dnl $libdir/pkgconfig, but the default can be changed by passing
 dnl DIRECTORY. The user can override through the --with-pkgconfigdir
 dnl parameter.
 AC_DEFUN([PKG_INSTALLDIR],
 [m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])])
 m4_pushdef([pkg_description],
     [pkg-config installation directory @<:@]pkg_default[@:>@])
 AC_ARG_WITH([pkgconfigdir],
     [AS_HELP_STRING([--with-pkgconfigdir], pkg_description)],,
     [with_pkgconfigdir=]pkg_default)
 AC_SUBST([pkgconfigdir], [$with_pkgconfigdir])
 m4_popdef([pkg_default])
 m4_popdef([pkg_description])
 ])dnl PKG_INSTALLDIR


 dnl PKG_NOARCH_INSTALLDIR([DIRECTORY])
 dnl --------------------------------
 dnl Since: 0.27
 dnl
 dnl Substitutes the variable noarch_pkgconfigdir as the location where a
 dnl module should install arch-independent pkg-config .pc files. By
 dnl default the directory is $datadir/pkgconfig, but the default can be
 dnl changed by passing DIRECTORY. The user can override through the
 dnl --with-noarch-pkgconfigdir parameter.
 AC_DEFUN([PKG_NOARCH_INSTALLDIR],
 [m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])])
 m4_pushdef([pkg_description],
     [pkg-config arch-independent installation directory @<:@]pkg_default[@:>@])
 AC_ARG_WITH([noarch-pkgconfigdir],
     [AS_HELP_STRING([--with-noarch-pkgconfigdir], pkg_description)],,
     [with_noarch_pkgconfigdir=]pkg_default)
 AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir])
 m4_popdef([pkg_default])
 m4_popdef([pkg_description])
 ])dnl PKG_NOARCH_INSTALLDIR


 dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
 dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
 dnl -------------------------------------------
 dnl Since: 0.28
 dnl
 dnl Retrieves the value of the pkg-config variable for the given module.
 AC_DEFUN([PKG_CHECK_VAR],
 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
 AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl

 _PKG_CONFIG([$1], [variable="][$3]["], [$2])
 AS_VAR_COPY([$1], [pkg_cv_][$1])

 AS_VAR_IF([$1], [""], [$5], [$4])dnl
 ])dnl PKG_CHECK_VAR

 dnl PKG_WITH_MODULES(VARIABLE-PREFIX, MODULES,
 dnl   [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND],
 dnl   [DESCRIPTION], [DEFAULT])
 dnl ------------------------------------------
 dnl
 dnl Prepare a "--with-" configure option using the lowercase
 dnl [VARIABLE-PREFIX] name, merging the behaviour of AC_ARG_WITH and
 dnl PKG_CHECK_MODULES in a single macro.
 AC_DEFUN([PKG_WITH_MODULES],
 [
 m4_pushdef([with_arg], m4_tolower([$1]))

 m4_pushdef([description],
            [m4_default([$5], [build with ]with_arg[ support])])

 m4_pushdef([def_arg], [m4_default([$6], [auto])])
 m4_pushdef([def_action_if_found], [AS_TR_SH([with_]with_arg)=yes])
 m4_pushdef([def_action_if_not_found], [AS_TR_SH([with_]with_arg)=no])

 m4_case(def_arg,
             [yes],[m4_pushdef([with_without], [--without-]with_arg)],
             [m4_pushdef([with_without],[--with-]with_arg)])

 AC_ARG_WITH(with_arg,
      AS_HELP_STRING(with_without, description[ @<:@default=]def_arg[@:>@]),,
     [AS_TR_SH([with_]with_arg)=def_arg])

 AS_CASE([$AS_TR_SH([with_]with_arg)],
             [yes],[PKG_CHECK_MODULES([$1],[$2],$3,$4)],
             [auto],[PKG_CHECK_MODULES([$1],[$2],
                                         [m4_n([def_action_if_found]) $3],
                                         [m4_n([def_action_if_not_found]) $4])])

 m4_popdef([with_arg])
 m4_popdef([description])
 m4_popdef([def_arg])

 ])dnl PKG_WITH_MODULES

 dnl PKG_HAVE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
 dnl   [DESCRIPTION], [DEFAULT])
 dnl -----------------------------------------------
 dnl
 dnl Convenience macro to trigger AM_CONDITIONAL after PKG_WITH_MODULES
 dnl check._[VARIABLE-PREFIX] is exported as make variable.
 AC_DEFUN([PKG_HAVE_WITH_MODULES],
 [
 PKG_WITH_MODULES([$1],[$2],,,[$3],[$4])

 AM_CONDITIONAL([HAVE_][$1],
                [test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"])
 ])dnl PKG_HAVE_WITH_MODULES

 dnl PKG_HAVE_DEFINE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
 dnl   [DESCRIPTION], [DEFAULT])
 dnl ------------------------------------------------------
 dnl
 dnl Convenience macro to run AM_CONDITIONAL and AC_DEFINE after
 dnl PKG_WITH_MODULES check. HAVE_[VARIABLE-PREFIX] is exported as make
 dnl and preprocessor variable.
 AC_DEFUN([PKG_HAVE_DEFINE_WITH_MODULES],
 [
 PKG_HAVE_WITH_MODULES([$1],[$2],[$3],[$4])

 AS_IF([test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"],
         [AC_DEFINE([HAVE_][$1], 1, [Enable ]m4_tolower([$1])[ support])])
 ])dnl PKG_HAVE_DEFINE_WITH_MODULES

 m4_include([m4/ax_c_float_words_bigendian.m4])
 m4_include([m4/ax_check_openssl.m4])
	# generated automatically by aclocal 1.16.2 -- Autoconf --

	# Copyright (C) 1996-2020 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.

	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
	# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
	# PARTICULAR PURPOSE.

	m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
	# ===========================================================================
	# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
	# ===========================================================================
	#
	# SYNOPSIS
	#
	# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
	#
	# DESCRIPTION
	#
	# Check whether the given FLAG works with the current language's compiler
	# or gives an error. (Warnings, however, are ignored)
	#
	# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
	# success/failure.
	#
	# If EXTRA-FLAGS is defined, it is added to the current language's default
	# flags (e.g. CFLAGS) when the check is done. The check is thus made with
	# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
	# force the compiler to issue an error when a bad flag is given.
	#
	# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
	#
	# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
	# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
	#
	# LICENSE
	#
	# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
	# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
	#
	# Copying and distribution of this file, with or without modification, are
	# permitted in any medium without royalty provided the copyright notice
	# and this notice are preserved. This file is offered as-is, without any
	# warranty.

	#serial 6

	AC_DEFUN([AX_CHECK_COMPILE_FLAG],
	[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
	AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
	AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
	ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
	_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
	AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
	[AS_VAR_SET(CACHEVAR,[yes])],
	[AS_VAR_SET(CACHEVAR,[no])])
	_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
	AS_VAR_IF(CACHEVAR,yes,
	[m4_default([$2], :)],
	[m4_default([$3], :)])
	AS_VAR_POPDEF([CACHEVAR])dnl
	])dnl AX_CHECK_COMPILE_FLAGS

	# pkg.m4 - Macros to locate and utilise pkg-config. -- Autoconf --
	# serial 11 (pkg-config-0.29.1)

	dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
	dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
	dnl
	dnl This program is free software; you can redistribute it and/or modify
	dnl it under the terms of the GNU General Public License as published by
	dnl the Free Software Foundation; either version 2 of the License, or
	dnl (at your option) any later version.
	dnl
	dnl This program is distributed in the hope that it will be useful, but
	dnl WITHOUT ANY WARRANTY; without even the implied warranty of
	dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	dnl General Public License for more details.
	dnl
	dnl You should have received a copy of the GNU General Public License
	dnl along with this program; if not, write to the Free Software
	dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
	dnl 02111-1307, USA.
	dnl
	dnl As a special exception to the GNU General Public License, if you
	dnl distribute this file as part of a program that contains a
	dnl configuration script generated by Autoconf, you may include it under
	dnl the same distribution terms that you use for the rest of that
	dnl program.

	dnl PKG_PREREQ(MIN-VERSION)
	dnl -----------------------
	dnl Since: 0.29
	dnl
	dnl Verify that the version of the pkg-config macros are at least
	dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's
	dnl installed version of pkg-config, this checks the developer's version
	dnl of pkg.m4 when generating configure.
	dnl
	dnl To ensure that this macro is defined, also add:
	dnl m4_ifndef([PKG_PREREQ],
	dnl [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])])
	dnl
	dnl See the "Since" comment for each macro you use to see what version
	dnl of the macros you require.
	m4_defun([PKG_PREREQ],
	[m4_define([PKG_MACROS_VERSION], [0.29.1])
	m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
	[m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
	])dnl PKG_PREREQ

	dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
	dnl ----------------------------------
	dnl Since: 0.16
	dnl
	dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
	dnl first found in the path. Checks that the version of pkg-config found
	dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
	dnl used since that's the first version where most current features of
	dnl pkg-config existed.
	AC_DEFUN([PKG_PROG_PKG_CONFIG],
	[m4_pattern_forbid([^_?PKG_[A-Z_]+$])
	m4_pattern_allow([^PKG_CONFIG(_(PATH\|LIBDIR\|SYSROOT_DIR\|ALLOW_SYSTEM_(CFLAGS\|LIBS)))?$])
	m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED\|TOP_BUILD_DIR\|DEBUG_SPEW)$])
	AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
	AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
	AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path])

	if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
	AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
	fi
	if test -n "$PKG_CONFIG"; then
	_pkg_min_version=m4_default([$1], [0.9.0])
	AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
	AC_MSG_RESULT([yes])
	else
	AC_MSG_RESULT([no])
	PKG_CONFIG=""
	fi
	fi[]dnl
	])dnl PKG_PROG_PKG_CONFIG

	dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
	dnl -------------------------------------------------------------------
	dnl Since: 0.18
	dnl
	dnl Check to see whether a particular set of modules exists. Similar to
	dnl PKG_CHECK_MODULES(), but does not set variables or print errors.
	dnl
	dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
	dnl only at the first occurence in configure.ac, so if the first place
	dnl it's called might be skipped (such as if it is within an "if", you
	dnl have to call PKG_CHECK_EXISTS manually
	AC_DEFUN([PKG_CHECK_EXISTS],
	[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
	if test -n "$PKG_CONFIG" && \
	AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
	m4_default([$2], [:])
	m4_ifvaln([$3], [else
	$3])dnl
	fi])

	dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
	dnl ---------------------------------------------
	dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting
	dnl pkg_failed based on the result.
	m4_define([_PKG_CONFIG],
	[if test -n "$$1"; then
	pkg_cv_[]$1="$$1"
	elif test -n "$PKG_CONFIG"; then
	PKG_CHECK_EXISTS([$3],
	[pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`
	test "x$?" != "x0" && pkg_failed=yes ],
	[pkg_failed=yes])
	else
	pkg_failed=untried
	fi[]dnl
	])dnl _PKG_CONFIG

	dnl _PKG_SHORT_ERRORS_SUPPORTED
	dnl ---------------------------
	dnl Internal check to see if pkg-config supports short errors.
	AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
	[AC_REQUIRE([PKG_PROG_PKG_CONFIG])
	if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
	_pkg_short_errors_supported=yes
	else
	_pkg_short_errors_supported=no
	fi[]dnl
	])dnl _PKG_SHORT_ERRORS_SUPPORTED


	dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
	dnl [ACTION-IF-NOT-FOUND])
	dnl --------------------------------------------------------------
	dnl Since: 0.4.0
	dnl
	dnl Note that if there is a possibility the first call to
	dnl PKG_CHECK_MODULES might not happen, you should be sure to include an
	dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
	AC_DEFUN([PKG_CHECK_MODULES],
	[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
	AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
	AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl

	pkg_failed=no
	AC_MSG_CHECKING([for $1])

	_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
	_PKG_CONFIG([$1][_LIBS], [libs], [$2])

	m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
	and $1[]_LIBS to avoid the need to call pkg-config.
	See the pkg-config man page for more details.])

	if test $pkg_failed = yes; then
	AC_MSG_RESULT([no])
	_PKG_SHORT_ERRORS_SUPPORTED
	if test $_pkg_short_errors_supported = yes; then
	$1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
	else
	$1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
	fi
	# Put the nasty error message in config.log where it belongs
	echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD

	m4_default([$4], [AC_MSG_ERROR(
	[Package requirements ($2) were not met:

	$$1_PKG_ERRORS

	Consider adjusting the PKG_CONFIG_PATH environment variable if you
	installed software in a non-standard prefix.

	_PKG_TEXT])[]dnl
	])
	elif test $pkg_failed = untried; then
	AC_MSG_RESULT([no])
	m4_default([$4], [AC_MSG_FAILURE(
	[The pkg-config script could not be found or is too old. Make sure it
	is in your PATH or set the PKG_CONFIG environment variable to the full
	path to pkg-config.

	_PKG_TEXT

	To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
	])
	else
	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS
	AC_MSG_RESULT([yes])
	$3
	fi[]dnl
	])dnl PKG_CHECK_MODULES


	dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
	dnl [ACTION-IF-NOT-FOUND])
	dnl ---------------------------------------------------------------------
	dnl Since: 0.29
	dnl
	dnl Checks for existence of MODULES and gathers its build flags with
	dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags
	dnl and VARIABLE-PREFIX_LIBS from --libs.
	dnl
	dnl Note that if there is a possibility the first call to
	dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to
	dnl include an explicit call to PKG_PROG_PKG_CONFIG in your
	dnl configure.ac.
	AC_DEFUN([PKG_CHECK_MODULES_STATIC],
	[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
	_save_PKG_CONFIG=$PKG_CONFIG
	PKG_CONFIG="$PKG_CONFIG --static"
	PKG_CHECK_MODULES($@)
	PKG_CONFIG=$_save_PKG_CONFIG[]dnl
	])dnl PKG_CHECK_MODULES_STATIC


	dnl PKG_INSTALLDIR([DIRECTORY])
	dnl -------------------------
	dnl Since: 0.27
	dnl
	dnl Substitutes the variable pkgconfigdir as the location where a module
	dnl should install pkg-config .pc files. By default the directory is
	dnl $libdir/pkgconfig, but the default can be changed by passing
	dnl DIRECTORY. The user can override through the --with-pkgconfigdir
	dnl parameter.
	AC_DEFUN([PKG_INSTALLDIR],
	[m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])])
	m4_pushdef([pkg_description],
	[pkg-config installation directory @<:@]pkg_default[@:>@])
	AC_ARG_WITH([pkgconfigdir],
	[AS_HELP_STRING([--with-pkgconfigdir], pkg_description)],,
	[with_pkgconfigdir=]pkg_default)
	AC_SUBST([pkgconfigdir], [$with_pkgconfigdir])
	m4_popdef([pkg_default])
	m4_popdef([pkg_description])
	])dnl PKG_INSTALLDIR


	dnl PKG_NOARCH_INSTALLDIR([DIRECTORY])
	dnl --------------------------------
	dnl Since: 0.27
	dnl
	dnl Substitutes the variable noarch_pkgconfigdir as the location where a
	dnl module should install arch-independent pkg-config .pc files. By
	dnl default the directory is $datadir/pkgconfig, but the default can be
	dnl changed by passing DIRECTORY. The user can override through the
	dnl --with-noarch-pkgconfigdir parameter.
	AC_DEFUN([PKG_NOARCH_INSTALLDIR],
	[m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])])
	m4_pushdef([pkg_description],
	[pkg-config arch-independent installation directory @<:@]pkg_default[@:>@])
	AC_ARG_WITH([noarch-pkgconfigdir],
	[AS_HELP_STRING([--with-noarch-pkgconfigdir], pkg_description)],,
	[with_noarch_pkgconfigdir=]pkg_default)
	AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir])
	m4_popdef([pkg_default])
	m4_popdef([pkg_description])
	])dnl PKG_NOARCH_INSTALLDIR


	dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
	dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
	dnl -------------------------------------------
	dnl Since: 0.28
	dnl
	dnl Retrieves the value of the pkg-config variable for the given module.
	AC_DEFUN([PKG_CHECK_VAR],
	[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
	AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl

	_PKG_CONFIG([$1], [variable="][$3]["], [$2])
	AS_VAR_COPY([$1], [pkg_cv_][$1])

	AS_VAR_IF([$1], [""], [$5], [$4])dnl
	])dnl PKG_CHECK_VAR

	dnl PKG_WITH_MODULES(VARIABLE-PREFIX, MODULES,
	dnl [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND],
	dnl [DESCRIPTION], [DEFAULT])
	dnl ------------------------------------------
	dnl
	dnl Prepare a "--with-" configure option using the lowercase
	dnl [VARIABLE-PREFIX] name, merging the behaviour of AC_ARG_WITH and
	dnl PKG_CHECK_MODULES in a single macro.
	AC_DEFUN([PKG_WITH_MODULES],
	[
	m4_pushdef([with_arg], m4_tolower([$1]))

	m4_pushdef([description],
	[m4_default([$5], [build with ]with_arg[ support])])

	m4_pushdef([def_arg], [m4_default([$6], [auto])])
	m4_pushdef([def_action_if_found], [AS_TR_SH([with_]with_arg)=yes])
	m4_pushdef([def_action_if_not_found], [AS_TR_SH([with_]with_arg)=no])

	m4_case(def_arg,
	[yes],[m4_pushdef([with_without], [--without-]with_arg)],
	[m4_pushdef([with_without],[--with-]with_arg)])

	AC_ARG_WITH(with_arg,
	AS_HELP_STRING(with_without, description[ @<:@default=]def_arg[@:>@]),,
	[AS_TR_SH([with_]with_arg)=def_arg])

	AS_CASE([$AS_TR_SH([with_]with_arg)],
	[yes],[PKG_CHECK_MODULES([$1],[$2],$3,$4)],
	[auto],[PKG_CHECK_MODULES([$1],[$2],
	[m4_n([def_action_if_found]) $3],
	[m4_n([def_action_if_not_found]) $4])])

	m4_popdef([with_arg])
	m4_popdef([description])
	m4_popdef([def_arg])

	])dnl PKG_WITH_MODULES

	dnl PKG_HAVE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
	dnl [DESCRIPTION], [DEFAULT])
	dnl -----------------------------------------------
	dnl
	dnl Convenience macro to trigger AM_CONDITIONAL after PKG_WITH_MODULES
	dnl check._[VARIABLE-PREFIX] is exported as make variable.
	AC_DEFUN([PKG_HAVE_WITH_MODULES],
	[
	PKG_WITH_MODULES([$1],[$2],,,[$3],[$4])

	AM_CONDITIONAL([HAVE_][$1],
	[test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"])
	])dnl PKG_HAVE_WITH_MODULES

	dnl PKG_HAVE_DEFINE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
	dnl [DESCRIPTION], [DEFAULT])
	dnl ------------------------------------------------------
	dnl
	dnl Convenience macro to run AM_CONDITIONAL and AC_DEFINE after
	dnl PKG_WITH_MODULES check. HAVE_[VARIABLE-PREFIX] is exported as make
	dnl and preprocessor variable.
	AC_DEFUN([PKG_HAVE_DEFINE_WITH_MODULES],
	[
	PKG_HAVE_WITH_MODULES([$1],[$2],[$3],[$4])

	AS_IF([test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"],
	[AC_DEFINE([HAVE_][$1], 1, [Enable ]m4_tolower([$1])[ support])])
	])dnl PKG_HAVE_DEFINE_WITH_MODULES

	m4_include([m4/ax_c_float_words_bigendian.m4])
	m4_include([m4/ax_check_openssl.m4])