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	diff --git a/configure.ac b/configure.ac
	index 9d551813..0e0b9d97 100644
	--- a/configure.ac
	+++ b/configure.ac
	@@ -1,1174 +1,1174 @@
	# configure.ac for GPGME
	# Copyright (C) 2000 Werner Koch (dd9jn)
	# Copyright (C) 2001-2021 g10 Code GmbH
	#
	# This file is part of GPGME.
	#
	# GPGME is free software; you can redistribute it and/or modify it
	# under the terms of the GNU Lesser General Public License as
	# published by the Free Software Foundation; either version 2.1 of the
	# License, or (at your option) any later version.
	#
	# GPGME is distributed in the hope that it will be useful, but WITHOUT
	# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
	# Public License for more details.
	#
	# You should have received a copy of the GNU Lesser General Public
	# License along with this program; if not, see <https://gnu.org/licenses/>.
	# SPDX-License-Identifier: LGPL-2.1-or-later

	# (Process this file with autoconf to produce a configure script.)
	AC_PREREQ([2.69])
	min_automake_version="1.14"

	# To build a release you need to create a tag with the version number
	# "gpgme-n.m.k" and run "./autogen.sh --force". Please bump the
	# version number immediately after the release and do another commit
	# and push so that the git magic is able to work. If you start a new
	# series by bumping the minor (m) remember to also create a tag named
	# "gpgme-n.m-base" as the start point for beta numbering. See below
	# for the LT versions.
	m4_define([mym4_package],[gpgme])
	m4_define([mym4_major], [1])
	m4_define([mym4_minor], [23])
	m4_define([mym4_micro], [3])

	# Below is m4 magic to extract and compute the git revision number,
	# the decimalized short revision number, a beta version string and a
	# flag indicating a development version (mym4_isbeta). Note that the
	# m4 processing is done by autoconf and not during the configure run.
	m4_define([mym4_verslist], m4_split(m4_esyscmd([./autogen.sh --find-version] \
	mym4_package mym4_major mym4_minor mym4_micro),[:]))
	m4_define([mym4_isbeta], m4_argn(2, mym4_verslist))
	m4_define([mym4_version], m4_argn(4, mym4_verslist))
	m4_define([mym4_revision], m4_argn(7, mym4_verslist))
	m4_define([mym4_revision_dec], m4_argn(8, mym4_verslist))
	m4_esyscmd([echo ]mym4_version[>VERSION])
	AC_INIT([mym4_package],[mym4_version],[https://bugs.gnupg.org])

	# LT Version numbers, remember to change them just before a release.
	# (Code changed: REVISION++)
	# (Interfaces added/removed/changed: CURRENT++, REVISION=0)
	# (Interfaces added: AGE++)
	# (Interfaces removed: AGE=0)
	#
	LIBGPGME_LT_CURRENT=43
	LIBGPGME_LT_AGE=32
	LIBGPGME_LT_REVISION=1

	# If there is an ABI break in gpgmepp or qgpgme also bump the
	# version in IMPORTED_LOCATION in the GpgmeppConfig-w32.cmake.in.in

	LIBGPGMEPP_LT_CURRENT=26
	LIBGPGMEPP_LT_AGE=20
	LIBGPGMEPP_LT_REVISION=1

	LIBQGPGME_LT_CURRENT=20
	LIBQGPGME_LT_AGE=5
	LIBQGPGME_LT_REVISION=1
	################################################

	AC_SUBST(LIBGPGME_LT_CURRENT)
	AC_SUBST(LIBGPGME_LT_AGE)
	AC_SUBST(LIBGPGME_LT_REVISION)

	AC_SUBST(LIBGPGMEPP_LT_CURRENT)
	AC_SUBST(LIBGPGMEPP_LT_AGE)
	AC_SUBST(LIBGPGMEPP_LT_REVISION)

	AC_SUBST(LIBQGPGME_LT_CURRENT)
	AC_SUBST(LIBQGPGME_LT_AGE)
	AC_SUBST(LIBQGPGME_LT_REVISION)

	# If the API is changed in an incompatible way: increment the next counter.
	GPGME_CONFIG_API_VERSION=1
	##############################################

	NEED_GPG_ERROR_VERSION=1.36
	NEED_LIBASSUAN_API=2
	NEED_LIBASSUAN_VERSION=2.4.2


	VERSION_MAJOR=mym4_major
	VERSION_MINOR=mym4_minor
	VERSION_MICRO=mym4_micro

	AC_CONFIG_AUX_DIR([build-aux])
	AC_CONFIG_MACRO_DIR([m4])
	AC_CONFIG_SRCDIR([src/gpgme.h.in])
	AC_CONFIG_HEADERS([conf/config.h])
	AM_INIT_AUTOMAKE([serial-tests dist-bzip2 no-dist-gzip])
	AM_MAINTAINER_MODE
	AC_CANONICAL_HOST
	AM_SILENT_RULES
	AC_ARG_VAR(SYSROOT,[locate config scripts also below that directory])

	# Enable GNU extensions on systems that have them.
	AC_USE_SYSTEM_EXTENSIONS

	# Taken from mpfr-4.0.1, then modified for LDADD_FOR_TESTS_KLUDGE
	dnl Under Linux, make sure that the old dtags are used if LD_LIBRARY_PATH
	dnl is defined. The issue is that with the new dtags, LD_LIBRARY_PATH has
	dnl the precedence over the run path, so that if a compatible MPFR library
	dnl is installed in some directory from $LD_LIBRARY_PATH, then the tested
	dnl MPFR library will be this library instead of the MPFR library from the
	dnl build tree. Other OS with the same issue might be added later.
	dnl
	dnl References:
	dnl https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=859732
	dnl http://lists.gnu.org/archive/html/libtool/2017-05/msg00000.html
	dnl
	dnl We need to check whether --disable-new-dtags is supported as alternate
	dnl linkers may be used (e.g., with tcc: CC=tcc LD=tcc).
	dnl
	case $host in
	--linux*)
	if test -n "$LD_LIBRARY_PATH"; then
	saved_LDFLAGS="$LDFLAGS"
	LDADD_FOR_TESTS_KLUDGE="-Wl,--disable-new-dtags"
	LDFLAGS="$LDFLAGS $LDADD_FOR_TESTS_KLUDGE"
	AC_MSG_CHECKING(whether --disable-new-dtags is supported by the linker)
	AC_LINK_IFELSE([AC_LANG_SOURCE([[
	int main (void) { return 0; }
	]])],
	[AC_MSG_RESULT(yes (use it since LD_LIBRARY_PATH is set))],
	[AC_MSG_RESULT(no)
	LDADD_FOR_TESTS_KLUDGE=""
	])
	LDFLAGS="$saved_LDFLAGS"
	fi
	;;
	esac
	AC_SUBST([LDADD_FOR_TESTS_KLUDGE])

	AH_VERBATIM([_REENTRANT],
	[/* To allow the use of GPGME in multithreaded programs we have to use
	special features from the library.
	IMPORTANT: gpgme is not yet fully reentrant and you should use it
	only from one thread. */
	#ifndef _REENTRANT
	# define _REENTRANT 1
	#endif])

	AC_PROG_CC
	AC_PROG_CPP
	AC_PROG_CXX

	# Note: A suitable gitlog-to-changelog script can be found in GnuPG master.
	AC_CHECK_PROGS(GITLOG_TO_CHANGELOG, gitlog-to-changelog, [gitlog-to-changelog])

	AC_SUBST(VERSION_MAJOR)
	AC_SUBST(VERSION_MINOR)
	AC_SUBST(VERSION_MICRO)

	VERSION_NUMBER=m4_esyscmd(printf "0x%02x%02x%02x" mym4_major \
	mym4_minor mym4_micro)
	AC_SUBST(VERSION_NUMBER)

	# We need to compile and run a program on the build machine. A
	# comment in libgpg-error says that the AC_PROG_CC_FOR_BUILD macro in
	# the AC archive is broken for autoconf 2.57. Given that there is no
	# newer version of that macro, we assume that it is also broken for
	# autoconf 2.61 and thus we use a simple but usually sufficient
	# approach.
	AC_MSG_CHECKING(for cc for build)
	if test "$cross_compiling" = "yes"; then
	CC_FOR_BUILD="${CC_FOR_BUILD-cc}"
	else
	CC_FOR_BUILD="${CC_FOR_BUILD-$CC}"
	fi
	AC_MSG_RESULT($CC_FOR_BUILD)
	AC_ARG_VAR(CC_FOR_BUILD,[build system C compiler])


	# Don't default to build static libs.
	LT_PREREQ([2.2.6])
	LT_INIT([win32-dll disable-static])
	LT_LANG([Windows Resource])

	# For now we hardcode the use of version scripts. It would be better
	# to write a test for this or even implement this within libtool.
	have_ld_version_script=no
	case "${host}" in
	--linux*)
	have_ld_version_script=yes
	;;
	--gnu*)
	have_ld_version_script=yes
	;;
	-apple-darwin)
	AC_DEFINE(_DARWIN_C_SOURCE, 1,
	Expose all libc features (__DARWIN_C_FULL).)
	AC_DEFINE(_XOPEN_SOURCE, 500, Activate POSIX interface on MacOS X)
	;;
	esac

	AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

	#
	# Specify how we support our local modification of libtool for Windows
	# 64-bit. Options are:
	#
	# (1) apply: when appying patch fails, it results failure of entire build
	# (2) never: never apply the patch (no try)
	# (3) try: use patched if it goes well, use original if fails
	#
	AC_ARG_WITH([libtool-modification],
	AS_HELP_STRING([--with-libtool-modification=apply\|never\|try],
	[how to handle libtool modification (default=never)]),
	build_libtool_modification=$withval,
	build_libtool_modification=never)

	#
	# Apply a patch (locally maintained one of ours) to libtool
	#
	case $host in
	x86_64-mingw32)
	AC_CONFIG_COMMANDS([libtool-patch],[[
	if test "$build_selection" = never; then
	echo "patch not applied"
	elif (mv -f libtool libtool.orig; \
	sed -f $srcdir/build-aux/libtool-patch.sed libtool.orig >libtool); then
	echo "applied successfully"
	elif test "$build_selection" = try; then
	mv -f libtool.orig libtool
	echo "patch failed, thus, using original"
	else
	echo "patch failed"
	as_fn_exit 1
	fi
	]],[build_selection=$build_libtool_modification])
	;;
	*)
	;;
	esac

	GPG_DEFAULT=no
	GPGSM_DEFAULT=no
	GPGCONF_DEFAULT=no
	G13_DEFAULT=no
	component_system=None
	have_dosish_system=no
	have_android_system=no
	have_w32_system=no
	have_w64_system=no
	have_macos_system=no
	build_w32_glib=no
	build_w32_qt=no
	available_languages="cl cpp python qt qt5 qt6"
	default_languages="cl cpp python qt"
	case "${host}" in
	x86_64-mingw32)
	have_w64_system=yes
	;;
	*-linux-androideabi)
	have_android_system=yes
	;;
	-apple-darwin)
	have_macos_system=yes
	;;
	esac
	case "${host}" in
	-mingw32)
	have_dosish_system=yes
	have_w32_system=yes
	GPG_DEFAULT='c:\\gnupg\\gpg.exe'
	GPGSM_DEFAULT='c:\\gnupg\\gpgsm.exe'
	GPGCONF_DEFAULT='c:\\gnupg\\gpgconf.exe'
	G13_DEFAULT='c:\\gnupg\\g13.exe'
	#component_system='COM+'

	AM_PATH_GLIB_2_0
	AC_ARG_ENABLE(w32-glib,
	AS_HELP_STRING([--enable-w32-glib],[build GPGME Glib for W32]),
	build_w32_glib=$enableval)
	;;
	*)

	# XXX: Probably use exec-prefix here?
	# GPG_DEFAULT='/usr/bin/gpg'
	# GPGSM_DEFAULT='/usr/bin/gpgsm'
	# GPGCONF_DEFAULT='/usr/bin/gpgconf'
	# G13_DEFAULT='/usr/bin/g13'
	;;
	esac

	if test "$have_dosish_system" = yes; then
	AC_DEFINE(HAVE_DOSISH_SYSTEM,1,
	[Defined if we run on some of the PCDOS like systems
	(DOS, Windoze. OS/2) with special properties like
	no file modes])
	fi
	AM_CONDITIONAL(HAVE_DOSISH_SYSTEM, test "$have_dosish_system" = yes)

	if test "$have_w32_system" = yes; then
	AC_DEFINE(HAVE_W32_SYSTEM,1,
	[Defined if we run on any kind of W32 API based system])
	fi
	AM_CONDITIONAL(HAVE_W32_SYSTEM, test "$have_w32_system" = yes)

	if test "$have_w64_system" = yes; then
	AC_DEFINE(HAVE_W64_SYSTEM,1,
	[Defined if we run on a 64 bit W32 API based system])
	fi
	AM_CONDITIONAL(HAVE_W64_SYSTEM, test "$have_w64_system" = yes)

	if test "$have_android_system" = yes; then
	AC_DEFINE(HAVE_ANDROID_SYSTEM,1, [Defined if we build for an Android system])
	fi
	AM_CONDITIONAL(HAVE_ANDROID_SYSTEM, test "$have_android_system" = yes)

	if test "$have_macos_system" = yes; then
	AC_DEFINE(HAVE_MACOS_SYSTEM,1,
	[Defined if we build for an MacOS system])
	fi
	AM_CONDITIONAL(HAVE_MACOS_SYSTEM, test "$have_macos_system" = yes)

	AM_CONDITIONAL(BUILD_W32_GLIB, test "$build_w32_glib" = yes)


	AC_ARG_ENABLE([fixed-path],
	AS_HELP_STRING([--enable-fixed-path=PATH],
	[locate binaries only via this PATH]),
	[fixed_search_path="$enableval"],
	[fixed_search_path=""])
	if test x$fixed_search_path != x ; then
	AC_DEFINE_UNQUOTED(FIXED_SEARCH_PATH, "$fixed_search_path",
	[Locate binaries only via this PATH])
	fi

	# Option --enable-reduce-relocations
	#
	# Allow building the Qt 6 bindings explicitly with -fPIC if the automatic
	# detection fails. Note: We assume that this flag is always available (unless
	# we built for Windows).
	AC_ARG_ENABLE([reduce-relocations],
	AS_HELP_STRING([--enable-reduce-relocations],
	[build Qt 6 bindings with -fPIC (default is
	auto)]),
	[use_reduce_relocations="$enableval"],
	[use_reduce_relocations=""])

	# Option --enable-no-direct-extern-access
	#
	# Some distributions build Qt 6 with -mno-direct-extern-access. Libraries and
	# applications using Qt then must also be build with this flag. As workaround
	# for a bug in Qt's pkgconfig files which don't have this flag we allow
	# building with this flag explicitly.
	AC_LANG_PUSH(C++)
	AX_CHECK_COMPILE_FLAG([-mno-direct-extern-access],
	[have_no_direct_extern_access="yes"],
	[have_no_direct_extern_access="no"],
	[-Werror])
	AC_LANG_POP()
	AC_ARG_ENABLE([no-direct-extern-access],
	AS_HELP_STRING([--enable-no-direct-extern-access],
	[build Qt 6 bindings with
	-mno-direct-extern-access (default is auto)]),
	[use_no_direct_extern_access="$enableval"],
	[use_no_direct_extern_access=""])


	# Note: You need to declare all possible languages also in
	# lang/Makefile.am's DIST_SUBDIRS.
	AC_ARG_ENABLE([languages],
	AS_HELP_STRING([--enable-languages=languages],
	[enable only specific language bindings:
	cl cpp python qt qt5 qt6 (qt selects qt5 or qt6,
	and qt5 and qt6 exclude each other)]),
	[enabled_languages=`echo $enableval \| \
	tr ',:' ' ' \| tr '[A-Z]' '[a-z]' \| \
	sed 's/c++/cpp/'`],
	[enabled_languages="maybe"])
	if test "x$enabled_languages" = "x" \
	-o "$enabled_languages" = "no"; then
	enabled_languages=
	fi

	# If languages are explicitly set missing requirements
	# for the languages are treated as errors otherwise
	# there will be a warning.
	explicit_languages=1
	if test "x$enabled_languages" = "xmaybe"; then
	explicit_languages=0
	enabled_languages="$default_languages"
	fi

	for language in $enabled_languages; do
	LIST_MEMBER($language, $available_languages)
	if test "$found" = "0"; then
	AC_MSG_ERROR([unsupported language binding specified])
	fi
	done

	# Check whether Qt5 and/or Qt6 are enabled explicitly
	want_qt5="no";
	LIST_MEMBER("qt5", $enabled_languages)
	if test "$found" = "1"; then
	want_qt5="yes";
	# Remove qt5; further down qt will be added
	enabled_languages=$(echo $enabled_languages \| sed 's/qt5//')
	fi
	want_qt6="no";
	LIST_MEMBER("qt6", $enabled_languages)
	if test "$found" = "1"; then
	want_qt6="yes";
	# Remove qt6; further down qt will be added
	enabled_languages=$(echo $enabled_languages \| sed 's/qt6//')
	fi
	if test "$want_qt5" = "yes" -a "$want_qt6" = "yes"; then
	AC_MSG_ERROR([[
	***
	*** The bindings for Qt5 and Qt6 cannot be built simultaneously.
	***]])
	fi

	# Ensure that pkg-config is available for all calls of FIND_QT5/FIND_QT6
	PKG_PROG_PKG_CONFIG

	# If the generic qt is enabled, then check for Qt5 or Qt6 (in this order)
	LIST_MEMBER("qt", $enabled_languages)
	if test "$found" = "1"; then
	# Remove the generic qt (qt5 and qt6 have already been removed)
	enabled_languages=$(echo $enabled_languages \| sed 's/qt//')
	FIND_QT5
	if test "$have_qt5_libs" = "yes"; then
	want_qt5="yes";
	else
	FIND_QT6
	if test "$have_qt6_libs" = "yes"; then
	want_qt6="yes";
	else
	if test "$explicit_languages" = "1"; then
	AC_MSG_ERROR([[
	***
	*** Qt5 (Qt5Core) or Qt6 (Qt6Core) is required for the Qt binding.
	***]])
	else
	AC_MSG_WARN([[
	***
	*** Qt5 (Qt5Core) and Qt6 (Qt6Core) not found. Qt Binding will be disabled.
	***]])
	fi
	fi
	fi
	elif test "$want_qt5" = "yes"; then
	FIND_QT5
	if test "$have_qt5_libs" != "yes"; then
	AC_MSG_ERROR([[
	***
	*** Qt5 (Qt5Core) is required for the Qt 5 binding.
	***]])
	fi
	elif test "$want_qt6" = "yes"; then
	FIND_QT6
	if test "$have_qt6_libs" != "yes"; then
	AC_MSG_ERROR([[
	***
	*** Qt6 (Qt6Core) is required for the Qt 6 binding.
	***]])
	fi
	fi

	# Check that cpp is enabled if qt5 or qt6 is enabled
	if test "$want_qt5" = "yes" -o "$want_qt6" = "yes"; then
	LIST_MEMBER("cpp", $enabled_languages)
	if test "$found" = "0"; then
	AC_MSG_ERROR([[
	***
	*** The Qt bindings depend on the C++ binding.
	***]])
	fi
	fi

	# Enable C++ 17 if qt6 is requested
	if test "$want_qt6" = "yes"; then
	AX_CXX_COMPILE_STDCXX(17, noext, optional)
	if test "$HAVE_CXX17" != "1"; then
	if test "$explicit_languages" = "1"; then
	AC_MSG_ERROR([[
	***
	*** A compiler with c++17 support is required for the Qt 6 binding.
	***]])
	else
	want_qt6="no"
	AC_MSG_WARN([[
	***
	*** No c++17 support detected. Qt 6 binding will be disabled.
	***]])
	fi
	fi
	fi

	# Enable C++ 11 if cpp is requested (unless C++ 17 was already enabled)
	LIST_MEMBER("cpp", $enabled_languages)
	if test "$found" = "1" -a "$HAVE_CXX17" != "1"; then
	AX_CXX_COMPILE_STDCXX(11, noext, optional)
	if test "$HAVE_CXX11" != "1"; then
	if test "$explicit_languages" = "1"; then
	AC_MSG_ERROR([[
	***
	*** A compiler with c++11 support is required for the C++ binding.
	***]])
	else
	enabled_languages=$(echo $enabled_languages \| sed 's/cpp//')
	want_qt5="no"
	AC_MSG_WARN([[
	***
	*** No c++11 support detected. C++ and Qt 5 bindings will be disabled.
	***]])
	fi
	fi
	fi

	# Now append qt to the list of language bindings
	if test "$want_qt5" = "yes" -o "$want_qt6" = "yes"; then
	enabled_languages=$(echo $enabled_languages qt)
	fi

	# Check whether compiler supports visibility attribute (if cpp language is enabled)
	LIST_MEMBER("cpp", $enabled_languages)
	if test "$found" = "1"; then
	AX_GCC_FUNC_ATTRIBUTE(visibility)
	if test "$ax_cv_have_func_attribute_visibility" = "yes"; then
	GPGME_CPP_CFLAGS="$GPGME_CPP_CFLAGS -fvisibility=hidden"
	if test "$want_qt5" = "yes"; then
	GPGME_QT5_CFLAGS="$GPGME_QT5_CFLAGS -fvisibility=hidden"
	fi
	if test "$want_qt6" = "yes"; then
	GPGME_QT6_CFLAGS="$GPGME_QT6_CFLAGS -fvisibility=hidden"
	fi
	fi
	fi
	AC_SUBST(GPGME_CPP_CFLAGS)

	AM_CONDITIONAL(WANT_QT5, test "$want_qt5" = yes)
	AM_CONDITIONAL(WANT_QT6, test "$want_qt6" = yes)

	# Check for tools for building the Qt binding docs
	if test "$want_qt5" = "yes" -o "$want_qt6" = "yes"; then
	AC_CHECK_PROGS([DOXYGEN], [doxygen])
	if test -z "$DOXYGEN"; then
	# This is not highlighted because it's not really important.
	AC_MSG_WARN([Doxygen not found - Qt binding doc will not be built.])
	fi
	AC_CHECK_PROGS([GRAPHVIZ], [dot])
	if test -z "$GRAPHVIZ"; then
	AC_MSG_WARN([Graphviz not found - Qt binding doc will not have diagrams.])
	fi
	fi

	AM_CONDITIONAL([HAVE_DOXYGEN],
	[test -n "$DOXYGEN"])
	if test -n "$GRAPHVIZ"; then
	HAVE_DOT="YES"
	else
	HAVE_DOT="NO"
	fi
	AC_SUBST(HAVE_DOT)

	# Python bindings.
	LIST_MEMBER("python", $enabled_languages)
	found_py=$found
	if test "$found_py" = "1"; then
	AX_PKG_SWIG
	if test -z "$SWIG"; then
	if test "$explicit_languages" = "1"; then
	AC_MSG_ERROR([[
	***
	*** You need SWIG to build the Python bindings.
	***]])
	else
	enabled_languages=$(echo $enabled_languages \| sed 's/python//')
	fi
	else
	# Reset the version collecting vars.
	PYTHONS=
	PYTHON_VERSIONS=

	if test "$found_py" = "1" -o "$found_py3" = "1"; then
	# Reset everything, so that we can look for another Python.
	m4_foreach([mym4pythonver],
	[[2.7],[3.4],[3.5],[3.6],[3.7],[3.8],[3.9],[3.10],
	[3.11],[3.12],[all]],
	[unset PYTHON
	unset PYTHON_VERSION
	unset PYTHON_CPPFLAGS
	unset PYTHON_LDFLAGS
	unset PYTHON_LIBS
	unset PYTHON_SITE_PKG
	unset PYTHON_EXTRA_LIBS
	unset PYTHON_EXTRA_LDFLAGS
	unset ac_cv_path_PYTHON
	unset am_cv_pathless_PYTHON
	unset am_cv_python_version
	unset am_cv_python_platform
	unset am_cv_python_pythondir
	unset am_cv_python_pyexecdir
	AM_PATH_PYTHON(mym4pythonver, [
	- AX_PYTHON_DEVEL
	+ AX_PYTHON_DEVEL([], [true])
	if test "$PYTHON_VERSION"; then
	PYTHONS="$(echo $PYTHONS $PYTHON)"
	PYTHON_VERSIONS="$(echo $PYTHON_VERSIONS $PYTHON_VERSION)"
	fi
	], :, m4_if([mym4pythonver],[all],[],[python]mym4pythonver))
	])
	fi

	# Recover some values lost in the second attempt to find Python.
	PYTHON="$(echo $PYTHONS \| cut -d ' ' -f 1)"
	PYTHON_VERSION="$(echo $PYTHON_VERSIONS \| cut -d ' ' -f 1)"

	# Remove duplicates.
	PYTHONS="$(echo $PYTHONS \| tr '[[:space:]]' '\n' \| sort \| uniq \| tr '\n' ' ' \| sed -e 's/ $//')"
	PYTHON_VERSIONS="$(echo $PYTHON_VERSIONS \| tr '[[:space:]]' '\n' \| sort \| uniq \| tr '\n' ' ' \| sed -e 's/ $//')"

	if test "$PYTHON_VERSIONS"; then
	enabled_languages_v=$(echo $enabled_languages \| sed -Ee "s/python[[23]]?/python ($PYTHON_VERSIONS)/")
	enabled_languages=$(echo $enabled_languages \| sed -Ee "s/python[[23]]?/python/")
	else
	if test "$explicit_languages" = "1"; then
	AC_MSG_ERROR([[
	***
	*** Please install the python development packages.
	***]])
	else
	enabled_languages=$(echo $enabled_languages \| sed 's/python//')
	fi
	fi

	AC_SUBST(PYTHONS, $PYTHONS)
	fi
	fi

	AC_SUBST(ENABLED_LANGUAGES, $enabled_languages)

	#
	# Provide information about the build.
	#
	BUILD_REVISION="mym4_revision"
	AC_SUBST(BUILD_REVISION)
	AC_DEFINE_UNQUOTED(BUILD_REVISION, "$BUILD_REVISION",
	[GIT commit id revision used to build this package])

	changequote(,)dnl
	BUILD_VERSION=`echo "$PACKAGE_VERSION" \| sed 's/$[0-9.]$./\1./'`
	changequote([,])dnl
	BUILD_VERSION="${BUILD_VERSION}mym4_revision_dec"
	BUILD_FILEVERSION=`echo "${BUILD_VERSION}" \| tr . ,`
	AC_SUBST(BUILD_VERSION)
	AC_SUBST(BUILD_FILEVERSION)

	AC_ARG_ENABLE([build-timestamp],
	AS_HELP_STRING([--enable-build-timestamp],
	[set an explicit build timestamp for reproducibility.
	(default is the current time in ISO-8601 format)]),
	[if test "$enableval" = "yes"; then
	BUILD_TIMESTAMP=`date -u +%Y-%m-%dT%H:%M+0000 2>/dev/null \|\| date`
	else
	BUILD_TIMESTAMP="$enableval"
	fi],
	[BUILD_TIMESTAMP="<none>"])
	AC_SUBST(BUILD_TIMESTAMP)
	AC_DEFINE_UNQUOTED(BUILD_TIMESTAMP, "$BUILD_TIMESTAMP",
	[The time this package was configured for a build])


	#
	# Options to disable some regression tests
	#
	run_gpgconf_test="yes"
	AC_ARG_ENABLE(gpgconf-test,
	AS_HELP_STRING([--disable-gpgconf-test],[disable GPGCONF regression test]),
	run_gpgconf_test=$enableval)
	AM_CONDITIONAL(RUN_GPGCONF_TESTS, test "$run_gpgconf_test" = "yes")

	run_gpg_test="yes"
	AC_ARG_ENABLE(gpg-test,
	AS_HELP_STRING([--disable-gpg-test],[disable GPG regression test]),
	run_gpg_test=$enableval)
	AM_CONDITIONAL(RUN_GPG_TESTS, test "$run_gpg_test" = "yes")

	run_gpgsm_test="yes"
	AC_ARG_ENABLE(gpgsm-test,
	AS_HELP_STRING([--disable-gpgsm-test],[disable GPGSM regression test]),
	run_gpgsm_test=$enableval)
	AM_CONDITIONAL(RUN_GPGSM_TESTS, test "$run_gpgsm_test" = "yes")

	run_g13_test="yes"
	AC_ARG_ENABLE(g13-test,
	AS_HELP_STRING([--disable-g13-test],[disable G13 regression test]),
	run_g13_test=$enableval)
	AM_CONDITIONAL(RUN_G13_TESTS, test "$run_g13_test" = "yes")


	# Checks for header files.
	AC_CHECK_HEADERS_ONCE([locale.h sys/select.h sys/uio.h argp.h stdint.h
	unistd.h poll.h sys/time.h sys/types.h sys/stat.h])


	# Type checks.
	AC_C_INLINE
	AC_C_FLEXIBLE_ARRAY_MEMBER
	AC_CHECK_SIZEOF(unsigned int)
	AC_SYS_LARGEFILE
	AC_TYPE_OFF_T
	AC_TYPE_UINTPTR_T

	# We require uint64_t
	if test "$ac_cv_header_stdint_h" != yes; then
	AC_MSG_ERROR([[
	***
	*** No stdint.h and thus no uint64_t type. Can't build this library.
	***]])
	fi


	# A simple compile time check in gpgme.h for GNU/Linux systems that
	# prevents a file offset bits mismatch between gpgme and the application.
	NEED__FILE_OFFSET_BITS=0
	if test "$have_w32_system" != yes; then
	case "$ac_cv_sys_file_offset_bits" in
	"" \| no \| unknown) ;;
	*)
	NEED__FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits
	;;
	esac
	fi
	AC_SUBST(NEED__FILE_OFFSET_BITS)

	# Figure out platform dependent typedefs for gpgme.h
	if test "$have_w32_system" = yes; then
	INSERT__TYPEDEFS_FOR_GPGME_H="
	#ifdef _WIN64
	# include <stdint.h>
	typedef int64_t gpgme_off_t;
	typedef int64_t gpgme_ssize_t;
	#else /* _WIN32 */
	typedef long gpgme_off_t;
	typedef long gpgme_ssize_t;
	#endif /* _WIN32 */"
	API__OFF_T="gpgme_off_t"
	API__SSIZE_T="gpgme_ssize_t"
	else
	INSERT__TYPEDEFS_FOR_GPGME_H="
	#include <sys/types.h>
	typedef off_t gpgme_off_t;
	typedef ssize_t gpgme_ssize_t;"
	API__OFF_T="off_t"
	API__SSIZE_T="ssize_t"
	fi
	AC_SUBST(INSERT__TYPEDEFS_FOR_GPGME_H)
	AM_SUBST_NOTMAKE(INSERT__TYPEDEFS_FOR_GPGME_H)
	AC_SUBST(API__OFF_T)
	AM_SUBST_NOTMAKE(API__OFF_T)
	AC_SUBST(API__SSIZE_T)
	AM_SUBST_NOTMAKE(API__SSIZE_T)

	# Checks for compiler features.
	if test "$GCC" = yes; then
	CFLAGS="$CFLAGS -Wall -Wcast-align -Wshadow -Wstrict-prototypes"
	CFLAGS="$CFLAGS -Wno-format-y2k"

	# If -Wno-missing-field-initializers is supported we can expect a
	# a larger set of warning options.
	AC_MSG_CHECKING([if gcc supports -Wno-missing-field-initializers])
	_gcc_cflags_save=$CFLAGS
	CFLAGS="-Wno-missing-field-initializers"
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_wopt=yes,_gcc_wopt=no)
	AC_MSG_RESULT($_gcc_wopt)
	CFLAGS=$_gcc_cflags_save;
	if test x"$_gcc_wopt" = xyes ; then
	CFLAGS="$CFLAGS -Wno-missing-field-initializers"
	CFLAGS="$CFLAGS -Wno-sign-compare"
	CFLAGS="$CFLAGS -Wno-format-zero-length"
	CFLAGS="$CFLAGS -Wno-format-truncation"
	CFLAGS="$CFLAGS -Wno-sizeof-pointer-div"
	fi
	if test "$USE_MAINTAINER_MODE" = "yes"; then
	if test x"$_gcc_wopt" = xyes ; then
	CFLAGS="$CFLAGS -W -Wextra -Wbad-function-cast"
	CFLAGS="$CFLAGS -Wwrite-strings"
	CFLAGS="$CFLAGS -Wdeclaration-after-statement"
	fi
	CFLAGS="$CFLAGS -Wformat -Wformat-security"
	CXXFLAGS="$CXXFLAGS -Wall -Wextra -Wno-shadow"

	AC_MSG_CHECKING([if gcc supports -Wpointer-arith])
	_gcc_cflags_save=$CFLAGS
	CFLAGS="-Wpointer-arith"
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_wopt=yes,_gcc_wopt=no)
	AC_MSG_RESULT($_gcc_wopt)
	CFLAGS=$_gcc_cflags_save;
	if test x"$_gcc_wopt" = xyes ; then
	CFLAGS="$CFLAGS -Wpointer-arith"
	fi
	fi
	if test "$have_w32_system" = yes; then
	CFLAGS="$CFLAGS -mms-bitfields"
	fi
	fi

	# Only used for debugging, so no serious test needed (for actual
	# functionality you have to test libc as well, this only tests the
	# compiler).
	AC_CACHE_CHECK([for __thread],[gpgme_cv_tls_works],
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([__thread int foo;])],
	gpgme_cv_tls_works=yes,gpgme_cv_tls_works=no))
	if test "$gpgme_cv_tls_works" = yes; then
	AC_DEFINE(HAVE_TLS, [1], [Define if __thread is supported])
	fi


	# Checks for library functions.
	AC_MSG_NOTICE([checking for libraries])

	AC_FUNC_FSEEKO

	# Try to find a thread-safe version of ttyname().
	gnupg_REPLACE_TTYNAME_R
	if test "$ac_cv_func_ttyname_r" != yes; then
	AC_MSG_WARN([
	***
	*** ttyname() is not thread-safe and ttyname_r() does not exist
	***])
	fi

	# Try to find a thread-safe version of getenv().
	have_thread_safe_getenv=no
	jm_GLIBC21
	if test $GLIBC21 = yes -o $have_w32_system = yes; then
	have_thread_safe_getenv=yes
	fi
	if test $have_thread_safe_getenv = yes; then
	AC_DEFINE(HAVE_THREAD_SAFE_GETENV, [1], [Define if getenv() is thread-safe])
	fi
	have_getenv_r=no
	AC_CHECK_FUNCS(getenv_r, have_getenv_r=yes)
	if test $have_getenv_r = no && test $have_thread_safe_getenv = no; then
	AC_MSG_WARN([
	***
	*** getenv() is not thread-safe and getenv_r() does not exist
	***])
	fi

	# For converting time strings to seconds since Epoch, we need the timegm
	# function.
	AC_CHECK_FUNCS(timegm)
	if test "$ac_cv_func_timegm" != yes; then
	AC_MSG_WARN([
	***
	*** timegm() not available - a non-thread-safe kludge will be used
	*** and the TZ variable might be changed at runtime.
	***])
	fi

	AC_CHECK_FUNCS(setlocale)

	# Checking for libgpg-error.
	have_gpg_error=no
	AM_PATH_GPG_ERROR("$NEED_GPG_ERROR_VERSION",
	have_gpg_error=yes, have_gpg_error=no)
	AC_DEFINE(GPG_ERR_SOURCE_DEFAULT, GPG_ERR_SOURCE_GPGME,
	[The default error source for GPGME.])

	AM_CONDITIONAL(USE_GPGRT_CONFIG, [test -n "$GPGRT_CONFIG" \
	-a "$ac_cv_path_GPG_ERROR_CONFIG" = no])

	# And for libassuan.
	have_libassuan=no
	AM_PATH_LIBASSUAN("$NEED_LIBASSUAN_API:$NEED_LIBASSUAN_VERSION",
	have_libassuan=yes, have_libassuan=no)
	if test "$have_libassuan" = "yes"; then
	AC_DEFINE_UNQUOTED(GPGME_LIBASSUAN_VERSION, "$libassuan_version",
	[version of the libassuan library])
	fi


	#
	# Other checks
	#

	# Check for getgid etc
	AC_CHECK_FUNCS(getgid getegid closefrom nanosleep)


	# Replacement functions.
	AC_REPLACE_FUNCS(stpcpy)
	AC_REPLACE_FUNCS(setenv)

	# Assuan check for descriptor passing.
	AC_CHECK_MEMBER(struct cmsghdr.cmsg_len,
	[supports_descriptor_passing=yes],
	[supports_descriptor_passing=no
	AC_MSG_WARN([
	***
	*** Data structure for sending ancillary data missing.
	*** Descriptor passing won't work.
	***])],[
	#include <stdlib.h>
	#include <stddef.h>
	#include <stdio.h>
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <sys/un.h>
	#if HAVE_SYS_UIO_H
	#include <sys/uio.h>
	#endif
	#include <unistd.h>
	])

	use_descriptor_passing=yes
	AC_ARG_ENABLE(fd-passing,
	AS_HELP_STRING([--disable-fd-passing],[do not use FD passing]),
	use_descriptor_passing=$enableval)

	if test "$supports_descriptor_passing" != "yes"; then
	use_descriptor_passing=no
	fi

	if test "$use_descriptor_passing" = "yes"; then
	AC_DEFINE(USE_DESCRIPTOR_PASSING,1,
	[Defined if descriptor passing is enabled and supported])
	fi

	AM_CONDITIONAL(USE_DESCRIPTOR_PASSING, test "$use_descriptor_passing" = "yes")


	uiserver=no
	if test "$use_descriptor_passing" = "yes" && test "$have_libassuan" = "yes"; then
	uiserver=yes
	fi
	if test "$uiserver" != "no"; then
	AC_DEFINE(ENABLE_UISERVER, 1,
	[Defined if we are building with uiserver support.])
	fi
	AM_CONDITIONAL(HAVE_UISERVER, test "$uiserver" != "no")


	# Option --disable-linux-getdents
	#
	# By default we use SYS_getdents on Linux to optimize fd closing
	# before an exec. This option allows to switch this optimization off.
	use_linux_getdents=yes
	AC_ARG_ENABLE(linux-getdents,
	AS_HELP_STRING([--disable-linux-getdents],
	[do not use SYS_getdents on Linux]),
	use_linux_getdents=$enableval)
	if test "$use_linux_getdents" = "yes"; then
	case "${host}" in
	--linux*)
	AC_DEFINE(USE_LINUX_GETDENTS,1,
	[Defined if SYS_getdents can be used on Linux])
	;;
	esac
	fi


	#
	# Add a few constants to help porting to W32
	#
	AH_VERBATIM([SEPCONSTANTS],
	[
	/* Separators as used in $PATH and file name. */
	#ifdef HAVE_DOSISH_SYSTEM
	#define PATHSEP_C ';'
	#define DIRSEP_C '\\'
	#define DIRSEP_S "\\"
	#else
	#define PATHSEP_C ':'
	#define DIRSEP_C '/'
	#define DIRSEP_S "/"
	#endif
	])

	AH_BOTTOM([
	/* Definition of GCC specific attributes. */
	#if __GNUC__ > 2
	# define GPGME_GCC_A_PURE __attribute__ ((__pure__))
	#else
	# define GPGME_GCC_A_PURE
	#endif

	/* Under Windows we use the gettext code from gpgrt. */
	#define GPG_ERR_ENABLE_GETTEXT_MACROS 1

	/* Under WindowsCE we need gpg-error's strerror macro. */
	#define GPG_ERR_ENABLE_ERRNO_MACROS 1

	#define CRIGHTBLURB "Copyright (C) 2000 Werner Koch\n" \
	"Copyright (C) 2001--2021 g10 Code GmbH\n"
	])


	# Substitution used for gpgme-config and gpgme.pc
	GPGME_CONFIG_LIBS="-lgpgme"
	GPGME_CONFIG_CFLAGS=""
	GPGME_CONFIG_HOST="$host"
	GPGME_CONFIG_AVAIL_LANG="$enabled_languages"

	case "$includedir" in
	/usr/include\|/include) ;;
	'${prefix}/include')
	if test "$prefix" != / -a "$prefix" != /usr; then
	if test -z "$GPGME_CONFIG_CFLAGS"; then
	GPGME_CONFIG_CFLAGS="-I\${includedir}"
	else
	GPGME_CONFIG_CFLAGS="-I\${includedir} $GPGME_CONFIG_CFLAGS"
	fi
	fi
	;;
	*)
	if test -z "$GPGME_CONFIG_CFLAGS"; then
	GPGME_CONFIG_CFLAGS="-I\${includedir}"
	else
	GPGME_CONFIG_CFLAGS="-I\${includedir} $GPGME_CONFIG_CFLAGS"
	fi
	;;
	esac
	case "$libdir" in
	/usr/lib\|/usr/lib64\|/lib\|/lib64) ;;
	'${exec_prefix}/lib'\|'${exec_prefix}/lib64')
	if test "$exec_prefix" = "NONE"; then
	if test "$prefix" != / -a "$prefix" != /usr; then
	GPGME_CONFIG_LIBS="-L\${libdir} $GPGME_CONFIG_LIBS"
	fi
	elif test "$exec_prefix" != / -a "$exec_prefix" != /usr; then
	GPGME_CONFIG_LIBS="-L\${libdir} $GPGME_CONFIG_LIBS"
	fi
	;;
	*) GPGME_CONFIG_LIBS="-L\${libdir} $GPGME_CONFIG_LIBS" ;;
	esac

	AC_SUBST(GPGME_CONFIG_API_VERSION)
	AC_SUBST(GPGME_CONFIG_LIBS)
	AC_SUBST(GPGME_CONFIG_CFLAGS)
	AC_SUBST(GPGME_CONFIG_HOST)
	AC_SUBST(GPGME_CONFIG_AVAIL_LANG)

	# Frob'da Variables
	LTLIBOBJS=`echo "$LIB@&t@OBJS" \|
	sed 's,\.[[^.]]* ,.lo ,g;s,\.[[^.]]*$,.lo,'`
	AC_SUBST(LTLIBOBJS)

	# Some checks for gpgme-tool
	# Done at top: AC_CHECK_HEADER([argp.h])
	AC_CHECK_TYPES([error_t], [],
	[AC_DEFINE([error_t], [int],
	[Define to a type to use for `error_t' if it is not otherwise available.])],
	[#include <errno.h>])


	# A substitution to set generated files in a Emacs buffer to read-only.
	AC_SUBST(emacs_local_vars_begin, [['Local][ ][Variables:']])
	AC_SUBST(emacs_local_vars_read_only, ['buffer-read-only: t'])
	AC_SUBST(emacs_local_vars_end, ['End:'])

	# Last check.
	die=no
	if test "$have_gpg_error" = "no"; then
	die=yes
	AC_MSG_NOTICE([[
	***
	*** You need libgpg-error to build this program.
	** This library is for example available at
	*** https://www.gnupg.org/ftp/gcrypt/libgpg-error/
	*** (at least version $NEED_GPG_ERROR_VERSION is required.)
	***]])
	fi
	if test "$have_libassuan" = "no"; then
	die=yes
	AC_MSG_NOTICE([[
	***
	*** You need libassuan to build this program.
	*** This library is for example available at
	*** https://www.gnupg.org/ftp/gcrypt/libassuan/
	*** (at least version $NEED_LIBASSUAN_VERSION (API $NEED_LIBASSUAN_API) is required).
	***]])
	fi

	if test "$die" = "yes"; then
	AC_MSG_ERROR([[
	***
	*** Required libraries not found. Please consult the above messages
	*** and install them before running configure again.
	***]])
	fi


	#
	# Create config files

	AC_CONFIG_FILES(Makefile src/Makefile
	tests/Makefile
	tests/gpg/Makefile
	tests/gpgsm/Makefile
	tests/opassuan/Makefile
	tests/json/Makefile
	doc/Makefile
	src/versioninfo.rc
	src/gpgme.pc
	src/gpgme-glib.pc
	src/gpgme.h)
	AC_CONFIG_FILES(src/gpgme-config, chmod +x src/gpgme-config)
	AC_CONFIG_FILES(lang/cpp/Makefile lang/cpp/src/Makefile)
	AC_CONFIG_FILES(lang/cpp/tests/Makefile)
	AC_CONFIG_FILES(lang/cpp/src/GpgmeppConfig-w32.cmake.in)
	AC_CONFIG_FILES(lang/cpp/src/GpgmeppConfig.cmake.in)
	AC_CONFIG_FILES(lang/cpp/src/GpgmeppConfigVersion.cmake)
	AC_CONFIG_FILES(lang/cpp/src/gpgmepp_version.h)
	AC_CONFIG_FILES(lang/qt/Makefile lang/qt/src/Makefile)
	if test "$want_qt5" = "yes"; then
	AC_CONFIG_FILES(lang/qt/src/QGpgmeConfig-w32.cmake.in)
	AC_CONFIG_FILES(lang/qt/src/QGpgmeConfig.cmake.in)
	AC_CONFIG_FILES(lang/qt/src/QGpgmeConfigVersion.cmake)
	fi
	if test "$want_qt6" = "yes"; then
	AC_CONFIG_FILES(lang/qt/src/QGpgmeQt6Config-w32.cmake.in)
	AC_CONFIG_FILES(lang/qt/src/QGpgmeQt6Config.cmake.in)
	AC_CONFIG_FILES(lang/qt/src/QGpgmeQt6ConfigVersion.cmake)
	fi
	AC_CONFIG_FILES(lang/qt/tests/Makefile)
	AC_CONFIG_FILES(lang/qt/src/qgpgme_version.h)
	AC_CONFIG_FILES([lang/Makefile lang/cl/Makefile lang/cl/gpgme.asd])
	AM_COND_IF([HAVE_DOXYGEN], [AC_CONFIG_FILES([lang/qt/doc/Doxyfile])])
	AC_CONFIG_FILES([lang/js/Makefile lang/js/src/Makefile
	lang/js/BrowserTestExtension/Makefile
	lang/js/DemoExtension/Makefile])
	AC_CONFIG_FILES(lang/qt/doc/Makefile)
	AC_CONFIG_FILES([lang/python/Makefile
	lang/python/version.py
	lang/python/tests/Makefile
	lang/python/src/Makefile
	lang/python/examples/Makefile
	lang/python/doc/Makefile])
	AC_CONFIG_FILES([lang/python/setup.py], [chmod a+x lang/python/setup.py])
	AC_OUTPUT

	if test "$want_qt5" = "yes"; then
	enabled_languages_v=$(echo ${enabled_languages_v:-$enabled_languages} \| sed "s/qt/qt (Qt 5)/")
	elif test "$want_qt6" = "yes"; then
	enabled_languages_v=$(echo ${enabled_languages_v:-$enabled_languages} \| sed "s/qt/qt (Qt 6)/")
	fi

	echo "
	GPGME v${VERSION} has been configured as follows:

	Revision: mym4_revision (mym4_revision_dec)
	Platform: $host

	UI Server: $uiserver
	FD Passing: $use_descriptor_passing

	Language bindings: ${enabled_languages_v:-$enabled_languages}
	"
	if test "x${gpg_config_script_warn}" != x; then
	cat <<G10EOF
	Mismatches between the target platform and the to
	be used libraries have been been detected for:
	${gpg_config_script_warn}
	Please check above for warning messages.

	G10EOF
	fi
	diff --git a/m4/ax_python_devel.m4 b/m4/ax_python_devel.m4
	index 55f0cfff..1f480db6 100644
	--- a/m4/ax_python_devel.m4
	+++ b/m4/ax_python_devel.m4
	@@ -1,326 +1,468 @@
	# ===========================================================================
	-# https://www.gnu.org/software/autoconf-archive/ax_python_devel.html
	+# https://www.gnu.org/software/autoconf-archive/ax_python_devel.html
	# ===========================================================================
	#
	# SYNOPSIS
	#
	-# AX_PYTHON_DEVEL([version])
	+# AX_PYTHON_DEVEL([version[,optional]])
	#
	# DESCRIPTION
	#
	# Note: Defines as a precious variable "PYTHON_VERSION". Don't override it
	# in your configure.ac.
	#
	# This macro checks for Python and tries to get the include path to
	-# 'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LDFLAGS)
	-# output variables. It also exports $(PYTHON_EXTRA_LIBS) and
	+# 'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LIBS) output
	+# variables. It also exports $(PYTHON_EXTRA_LIBS) and
	# $(PYTHON_EXTRA_LDFLAGS) for embedding Python in your code.
	#
	# You can search for some particular version of Python by passing a
	# parameter to this macro, for example ">= '2.3.1'", or "== '2.4'". Please
	# note that you have to pass also an operator along with the version to
	# match, and pay special attention to the single quotes surrounding the
	# version number. Don't use "PYTHON_VERSION" for this: that environment
	# variable is declared as precious and thus reserved for the end-user.
	#
	+# By default this will fail if it does not detect a development version of
	+# python. If you want it to continue, set optional to true, like
	+# AX_PYTHON_DEVEL([], [true]). The ax_python_devel_found variable will be
	+# "no" if it fails.
	+#
	# This macro should work for all versions of Python >= 2.1.0. As an end
	# user, you can disable the check for the python version by setting the
	# PYTHON_NOVERSIONCHECK environment variable to something else than the
	# empty string.
	#
	# If you need to use this macro for an older Python version, please
	# contact the authors. We're always open for feedback.
	#
	# LICENSE
	#
	# Copyright (c) 2009 Sebastian Huber <sebastian-huber@web.de>
	# Copyright (c) 2009 Alan W. Irwin
	# Copyright (c) 2009 Rafael Laboissiere <rafael@laboissiere.net>
	# Copyright (c) 2009 Andrew Collier
	# Copyright (c) 2009 Matteo Settenvini <matteo@member.fsf.org>
	# Copyright (c) 2009 Horst Knorr <hk_classes@knoda.org>
	# Copyright (c) 2013 Daniel Mullner <muellner@math.stanford.edu>
	#
	# This program is free software: you can redistribute it and/or modify it
	# under the terms of the GNU General Public License as published by the
	# Free Software Foundation, either version 3 of the License, or (at your
	# option) any later version.
	#
	# This program is distributed in the hope that it will be useful, but
	# WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
	# Public License for more details.
	#
	# You should have received a copy of the GNU General Public License along
	# with this program. If not, see <https://www.gnu.org/licenses/>.
	#
	# As a special exception, the respective Autoconf Macro's copyright owner
	# gives unlimited permission to copy, distribute and modify the configure
	# scripts that are the output of Autoconf when processing the Macro. You
	# need not follow the terms of the GNU General Public License when using
	# or distributing such scripts, even though portions of the text of the
	# Macro appear in them. The GNU General Public License (GPL) does govern
	# all other use of the material that constitutes the Autoconf Macro.
	#
	# This special exception to the GPL applies to versions of the Autoconf
	# Macro released by the Autoconf Archive. When you make and distribute a
	# modified version of the Autoconf Macro, you may extend this special
	# exception to the GPL to apply to your modified version as well.

	-#serial 17
	+#serial 36

	AU_ALIAS([AC_PYTHON_DEVEL], [AX_PYTHON_DEVEL])
	AC_DEFUN([AX_PYTHON_DEVEL],[
	+ # Get whether it's optional
	+ if test -z "$2"; then
	+ ax_python_devel_optional=false
	+ else
	+ ax_python_devel_optional=$2
	+ fi
	+ ax_python_devel_found=yes
	+
	#
	# Allow the use of a (user set) custom python version
	#
	AC_ARG_VAR([PYTHON_VERSION],[The installed Python
	version to use, for example '2.3'. This string
	will be appended to the Python interpreter
	canonical name.])

	AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
	if test -z "$PYTHON"; then
	- AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
	+ AC_MSG_WARN([Cannot find python$PYTHON_VERSION in your system path])
	+ if ! $ax_python_devel_optional; then
	+ AC_MSG_ERROR([Giving up, python development not available])
	+ fi
	+ ax_python_devel_found=no
	PYTHON_VERSION=""
	fi

	- #
	- # Check for a version of Python >= 2.1.0
	- #
	- AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
	- ac_supports_python_ver=`$PYTHON -c "import sys; \
	+ if test $ax_python_devel_found = yes; then
	+ #
	+ # Check for a version of Python >= 2.1.0
	+ #
	+ AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
	+ ac_supports_python_ver=`$PYTHON -c "import sys; \
	ver = sys.version.split ()[[0]]; \
	print (ver >= '2.1.0')"`
	- if test "$ac_supports_python_ver" != "True"; then
	+ if test "$ac_supports_python_ver" != "True"; then
	if test -z "$PYTHON_NOVERSIONCHECK"; then
	AC_MSG_RESULT([no])
	- AC_MSG_FAILURE([
	+ AC_MSG_WARN([
	This version of the AC@&t@_PYTHON_DEVEL macro
	doesn't work properly with versions of Python before
	2.1.0. You may need to re-run configure, setting the
	-variables PYTHON_CPPFLAGS, PYTHON_LDFLAGS, PYTHON_SITE_PKG,
	+variables PYTHON_CPPFLAGS, PYTHON_LIBS, PYTHON_SITE_PKG,
	PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
	Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
	to something else than an empty string.
	])
	+ if ! $ax_python_devel_optional; then
	+ AC_MSG_FAILURE([Giving up])
	+ fi
	+ ax_python_devel_found=no
	+ PYTHON_VERSION=""
	else
	AC_MSG_RESULT([skip at user request])
	fi
	- else
	+ else
	AC_MSG_RESULT([yes])
	+ fi
	fi

	- #
	- # if the macro parameter ``version'' is set, honour it
	- #
	- if test -n "$1"; then
	+ if test $ax_python_devel_found = yes; then
	+ #
	+ # If the macro parameter ``version'' is set, honour it.
	+ # A Python shim class, VPy, is used to implement correct version comparisons via
	+ # string expressions, since e.g. a naive textual ">= 2.7.3" won't work for
	+ # Python 2.7.10 (the ".1" being evaluated as less than ".3").
	+ #
	+ if test -n "$1"; then
	AC_MSG_CHECKING([for a version of Python $1])
	- ac_supports_python_ver=`$PYTHON -c "import sys; \
	- ver = sys.version.split ()[[0]]; \
	+ cat << EOF > ax_python_devel_vpy.py
	+class VPy:
	+ def vtup(self, s):
	+ return tuple(map(int, s.strip().replace("rc", ".").split(".")))
	+ def __init__(self):
	+ import sys
	+ self.vpy = tuple(sys.version_info)[[:3]]
	+ def __eq__(self, s):
	+ return self.vpy == self.vtup(s)
	+ def __ne__(self, s):
	+ return self.vpy != self.vtup(s)
	+ def __lt__(self, s):
	+ return self.vpy < self.vtup(s)
	+ def __gt__(self, s):
	+ return self.vpy > self.vtup(s)
	+ def __le__(self, s):
	+ return self.vpy <= self.vtup(s)
	+ def __ge__(self, s):
	+ return self.vpy >= self.vtup(s)
	+EOF
	+ ac_supports_python_ver=`$PYTHON -c "import ax_python_devel_vpy; \
	+ ver = ax_python_devel_vpy.VPy(); \
	print (ver $1)"`
	+ rm -rf ax_python_devel_vpy.py __pycache__/ax_python_devel_vpy.py
	if test "$ac_supports_python_ver" = "True"; then
	- AC_MSG_RESULT([yes])
	+ AC_MSG_RESULT([yes])
	else
	AC_MSG_RESULT([no])
	- AC_MSG_ERROR([this package requires Python $1.
	+ AC_MSG_WARN([this package requires Python $1.
	If you have it installed, but it isn't the default Python
	interpreter in your system path, please pass the PYTHON_VERSION
	variable to configure. See ``configure --help'' for reference.
	])
	+ if ! $ax_python_devel_optional; then
	+ AC_MSG_ERROR([Giving up])
	+ fi
	+ ax_python_devel_found=no
	PYTHON_VERSION=""
	fi
	+ fi
	fi

	- #
	- # Check if you have distutils, else fail
	- #
	- AC_MSG_CHECKING([for the distutils Python package])
	- ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
	- if test -z "$ac_distutils_result"; then
	+ if test $ax_python_devel_found = yes; then
	+ #
	+ # Check if you have distutils, else fail
	+ #
	+ AC_MSG_CHECKING([for the sysconfig Python package])
	+ ac_sysconfig_result=`$PYTHON -c "import sysconfig" 2>&1`
	+ if test $? -eq 0; then
	AC_MSG_RESULT([yes])
	- else
	+ IMPORT_SYSCONFIG="import sysconfig"
	+ else
	AC_MSG_RESULT([no])
	- AC_MSG_ERROR([cannot import Python module "distutils".
	+
	+ AC_MSG_CHECKING([for the distutils Python package])
	+ ac_sysconfig_result=`$PYTHON -c "from distutils import sysconfig" 2>&1`
	+ if test $? -eq 0; then
	+ AC_MSG_RESULT([yes])
	+ IMPORT_SYSCONFIG="from distutils import sysconfig"
	+ else
	+ AC_MSG_WARN([cannot import Python module "distutils".
	Please check your Python installation. The error was:
	-$ac_distutils_result])
	- PYTHON_VERSION=""
	+$ac_sysconfig_result])
	+ if ! $ax_python_devel_optional; then
	+ AC_MSG_ERROR([Giving up])
	+ fi
	+ ax_python_devel_found=no
	+ PYTHON_VERSION=""
	+ fi
	+ fi
	fi

	- #
	- # Check for Python include path
	- #
	- AC_MSG_CHECKING([for Python include path])
	- if test -z "$PYTHON_CPPFLAGS"; then
	- python_path=`$PYTHON -c "import distutils.sysconfig; \
	- print (distutils.sysconfig.get_python_inc ());"`
	- plat_python_path=`$PYTHON -c "import distutils.sysconfig; \
	- print (distutils.sysconfig.get_python_inc (plat_specific=1));"`
	+ if test $ax_python_devel_found = yes; then
	+ #
	+ # Check for Python include path
	+ #
	+ AC_MSG_CHECKING([for Python include path])
	+ if test -z "$PYTHON_CPPFLAGS"; then
	+ if test "$IMPORT_SYSCONFIG" = "import sysconfig"; then
	+ # sysconfig module has different functions
	+ python_path=`$PYTHON -c "$IMPORT_SYSCONFIG; \
	+ print (sysconfig.get_path ('include'));"`
	+ plat_python_path=`$PYTHON -c "$IMPORT_SYSCONFIG; \
	+ print (sysconfig.get_path ('platinclude'));"`
	+ else
	+ # old distutils way
	+ python_path=`$PYTHON -c "$IMPORT_SYSCONFIG; \
	+ print (sysconfig.get_python_inc ());"`
	+ plat_python_path=`$PYTHON -c "$IMPORT_SYSCONFIG; \
	+ print (sysconfig.get_python_inc (plat_specific=1));"`
	+ fi
	if test -n "${python_path}"; then
	if test "${plat_python_path}" != "${python_path}"; then
	python_path="-I$python_path -I$plat_python_path"
	else
	python_path="-I$python_path"
	fi
	fi
	PYTHON_CPPFLAGS=$python_path
	- fi
	- AC_MSG_RESULT([$PYTHON_CPPFLAGS])
	- AC_SUBST([PYTHON_CPPFLAGS])
	+ fi
	+ AC_MSG_RESULT([$PYTHON_CPPFLAGS])
	+ AC_SUBST([PYTHON_CPPFLAGS])

	- #
	- # Check for Python library path
	- #
	- AC_MSG_CHECKING([for Python library path])
	- if test -z "$PYTHON_LDFLAGS"; then
	+ #
	+ # Check for Python library path
	+ #
	+ AC_MSG_CHECKING([for Python library path])
	+ if test -z "$PYTHON_LIBS"; then
	# (makes two attempts to ensure we've got a version number
	# from the interpreter)
	ac_python_version=`cat<<EOD \| $PYTHON -

	# join all versioning strings, on some systems
	# major/minor numbers could be in different list elements
	-from distutils.sysconfig import *
	+from sysconfig import *
	e = get_config_var('VERSION')
	if e is not None:
	print(e)
	EOD`

	if test -z "$ac_python_version"; then
	if test -n "$PYTHON_VERSION"; then
	ac_python_version=$PYTHON_VERSION
	else
	ac_python_version=`$PYTHON -c "import sys; \
	- print (sys.version[[:3]])"`
	+ print ("%d.%d" % sys.version_info[[:2]])"`
	fi
	fi

	# Make the versioning information available to the compiler
	-
	- # JW: We don't need it and it interferes with the hack
	- # to detect multiple Pyhton versions
	- #AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
	- # [If available, contains the Python version number currently in use.])
	+ AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
	+ [If available, contains the Python version number currently in use.])

	# First, the library directory:
	ac_python_libdir=`cat<<EOD \| $PYTHON -

	# There should be only one
	-import distutils.sysconfig
	-e = distutils.sysconfig.get_config_var('LIBDIR')
	+$IMPORT_SYSCONFIG
	+e = sysconfig.get_config_var('LIBDIR')
	if e is not None:
	print (e)
	EOD`

	# Now, for the library:
	ac_python_library=`cat<<EOD \| $PYTHON -

	-import distutils.sysconfig
	-c = distutils.sysconfig.get_config_vars()
	+$IMPORT_SYSCONFIG
	+c = sysconfig.get_config_vars()
	if 'LDVERSION' in c:
	print ('python'+c[['LDVERSION']])
	else:
	print ('python'+c[['VERSION']])
	EOD`

	# This small piece shamelessly adapted from PostgreSQL python macro;
	# credits goes to momjian, I think. I'd like to put the right name
	# in the credits, if someone can point me in the right direction... ?
	#
	if test -n "$ac_python_libdir" -a -n "$ac_python_library"
	then
	# use the official shared library
	ac_python_library=`echo "$ac_python_library" \| sed "s/^lib//"`
	- PYTHON_LDFLAGS="-L$ac_python_libdir -l$ac_python_library"
	+ PYTHON_LIBS="-L$ac_python_libdir -l$ac_python_library"
	else
	# old way: use libpython from python_configdir
	ac_python_libdir=`$PYTHON -c \
	- "from distutils.sysconfig import get_python_lib as f; \
	+ "from sysconfig import get_python_lib as f; \
	import os; \
	print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
	- PYTHON_LDFLAGS="-L$ac_python_libdir -lpython$ac_python_version"
	+ PYTHON_LIBS="-L$ac_python_libdir -lpython$ac_python_version"
	fi

	- if test -z "PYTHON_LDFLAGS"; then
	- AC_MSG_ERROR([
	+ if test -z "PYTHON_LIBS"; then
	+ AC_MSG_WARN([
	Cannot determine location of your Python DSO. Please check it was installed with
	- dynamic libraries enabled, or try setting PYTHON_LDFLAGS by hand.
	+ dynamic libraries enabled, or try setting PYTHON_LIBS by hand.
	])
	+ if ! $ax_python_devel_optional; then
	+ AC_MSG_ERROR([Giving up])
	+ fi
	+ ax_python_devel_found=no
	+ PYTHON_VERSION=""
	fi
	+ fi
	fi
	- AC_MSG_RESULT([$PYTHON_LDFLAGS])
	- AC_SUBST([PYTHON_LDFLAGS])

	- #
	- # Check for site packages
	- #
	- AC_MSG_CHECKING([for Python site-packages path])
	- if test -z "$PYTHON_SITE_PKG"; then
	- PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
	- print (distutils.sysconfig.get_python_lib(0,0));"`
	- fi
	- AC_MSG_RESULT([$PYTHON_SITE_PKG])
	- AC_SUBST([PYTHON_SITE_PKG])
	+ if test $ax_python_devel_found = yes; then
	+ AC_MSG_RESULT([$PYTHON_LIBS])
	+ AC_SUBST([PYTHON_LIBS])

	- #
	- # libraries which must be linked in when embedding
	- #
	- AC_MSG_CHECKING(python extra libraries)
	- if test -z "$PYTHON_EXTRA_LIBS"; then
	- PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
	- conf = distutils.sysconfig.get_config_var; \
	+ #
	+ # Check for site packages
	+ #
	+ AC_MSG_CHECKING([for Python site-packages path])
	+ if test -z "$PYTHON_SITE_PKG"; then
	+ if test "$IMPORT_SYSCONFIG" = "import sysconfig"; then
	+ PYTHON_SITE_PKG=`$PYTHON -c "
	+$IMPORT_SYSCONFIG;
	+if hasattr(sysconfig, 'get_default_scheme'):
	+ scheme = sysconfig.get_default_scheme()
	+else:
	+ scheme = sysconfig._get_default_scheme()
	+if scheme == 'posix_local':
	+ # Debian's default scheme installs to /usr/local/ but we want to find headers in /usr/
	+ scheme = 'posix_prefix'
	+prefix = '$prefix'
	+if prefix == 'NONE':
	+ prefix = '$ac_default_prefix'
	+sitedir = sysconfig.get_path('purelib', scheme, vars={'base': prefix})
	+print(sitedir)"`
	+ else
	+ # distutils.sysconfig way
	+ PYTHON_SITE_PKG=`$PYTHON -c "$IMPORT_SYSCONFIG; \
	+ print (sysconfig.get_python_lib(0,0));"`
	+ fi
	+ fi
	+ AC_MSG_RESULT([$PYTHON_SITE_PKG])
	+ AC_SUBST([PYTHON_SITE_PKG])
	+
	+ #
	+ # Check for platform-specific site packages
	+ #
	+ AC_MSG_CHECKING([for Python platform specific site-packages path])
	+ if test -z "$PYTHON_PLATFORM_SITE_PKG"; then
	+ if test "$IMPORT_SYSCONFIG" = "import sysconfig"; then
	+ PYTHON_PLATFORM_SITE_PKG=`$PYTHON -c "
	+$IMPORT_SYSCONFIG;
	+if hasattr(sysconfig, 'get_default_scheme'):
	+ scheme = sysconfig.get_default_scheme()
	+else:
	+ scheme = sysconfig._get_default_scheme()
	+if scheme == 'posix_local':
	+ # Debian's default scheme installs to /usr/local/ but we want to find headers in /usr/
	+ scheme = 'posix_prefix'
	+prefix = '$prefix'
	+if prefix == 'NONE':
	+ prefix = '$ac_default_prefix'
	+sitedir = sysconfig.get_path('platlib', scheme, vars={'platbase': prefix})
	+print(sitedir)"`
	+ else
	+ # distutils.sysconfig way
	+ PYTHON_PLATFORM_SITE_PKG=`$PYTHON -c "$IMPORT_SYSCONFIG; \
	+ print (sysconfig.get_python_lib(1,0));"`
	+ fi
	+ fi
	+ AC_MSG_RESULT([$PYTHON_PLATFORM_SITE_PKG])
	+ AC_SUBST([PYTHON_PLATFORM_SITE_PKG])
	+
	+ #
	+ # libraries which must be linked in when embedding
	+ #
	+ AC_MSG_CHECKING(python extra libraries)
	+ if test -z "$PYTHON_EXTRA_LIBS"; then
	+ PYTHON_EXTRA_LIBS=`$PYTHON -c "$IMPORT_SYSCONFIG; \
	+ conf = sysconfig.get_config_var; \
	print (conf('LIBS') + ' ' + conf('SYSLIBS'))"`
	- fi
	- AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
	- AC_SUBST(PYTHON_EXTRA_LIBS)
	+ fi
	+ AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
	+ AC_SUBST(PYTHON_EXTRA_LIBS)

	- #
	- # linking flags needed when embedding
	- #
	- AC_MSG_CHECKING(python extra linking flags)
	- if test -z "$PYTHON_EXTRA_LDFLAGS"; then
	- PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
	- conf = distutils.sysconfig.get_config_var; \
	+ #
	+ # linking flags needed when embedding
	+ #
	+ AC_MSG_CHECKING(python extra linking flags)
	+ if test -z "$PYTHON_EXTRA_LDFLAGS"; then
	+ PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "$IMPORT_SYSCONFIG; \
	+ conf = sysconfig.get_config_var; \
	print (conf('LINKFORSHARED'))"`
	- fi
	- AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
	- AC_SUBST(PYTHON_EXTRA_LDFLAGS)
	+ # Hack for macos, it sticks this in here.
	+ PYTHON_EXTRA_LDFLAGS=`echo $PYTHON_EXTRA_LDFLAGS \| sed 's/CoreFoundation.*$/CoreFoundation/'`
	+ fi
	+ AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
	+ AC_SUBST(PYTHON_EXTRA_LDFLAGS)

	- #
	- # final check to see if everything compiles alright
	- #
	- AC_MSG_CHECKING([consistency of all components of python development environment])
	- # save current global flags
	- ac_save_LIBS="$LIBS"
	- ac_save_CPPFLAGS="$CPPFLAGS"
	- LIBS="$ac_save_LIBS $PYTHON_LDFLAGS $PYTHON_EXTRA_LDFLAGS $PYTHON_EXTRA_LIBS"
	- CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
	- AC_LANG_PUSH([C])
	- AC_LINK_IFELSE([
	+ #
	+ # final check to see if everything compiles alright
	+ #
	+ AC_MSG_CHECKING([consistency of all components of python development environment])
	+ # save current global flags
	+ ac_save_LIBS="$LIBS"
	+ ac_save_LDFLAGS="$LDFLAGS"
	+ ac_save_CPPFLAGS="$CPPFLAGS"
	+ LIBS="$ac_save_LIBS $PYTHON_LIBS $PYTHON_EXTRA_LIBS"
	+ LDFLAGS="$ac_save_LDFLAGS $PYTHON_EXTRA_LDFLAGS"
	+ CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
	+ AC_LANG_PUSH([C])
	+ AC_LINK_IFELSE([
	AC_LANG_PROGRAM([[#include <Python.h>]],
	[[Py_Initialize();]])
	],[pythonexists=yes],[pythonexists=no])
	- AC_LANG_POP([C])
	- # turn back to default flags
	- CPPFLAGS="$ac_save_CPPFLAGS"
	- LIBS="$ac_save_LIBS"
	+ AC_LANG_POP([C])
	+ # turn back to default flags
	+ CPPFLAGS="$ac_save_CPPFLAGS"
	+ LIBS="$ac_save_LIBS"
	+ LDFLAGS="$ac_save_LDFLAGS"

	- AC_MSG_RESULT([$pythonexists])
	+ AC_MSG_RESULT([$pythonexists])

	- if test ! "x$pythonexists" = "xyes"; then
	- AC_MSG_WARN([
	+ if test ! "x$pythonexists" = "xyes"; then
	+ AC_MSG_WARN([
	Could not link test program to Python. Maybe the main Python library has been
	installed in some non-standard library path. If so, pass it to configure,
	- via the LDFLAGS environment variable.
	- Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
	+ via the LIBS environment variable.
	+ Example: ./configure LIBS="-L/usr/non-standard-path/python/lib"
	============================================================================
	+ ERROR!
	You probably have to install the development version of the Python package
	for your distribution. The exact name of this package varies among them.
	============================================================================
	- ])
	- PYTHON_VERSION=""
	+ ])
	+ if ! $ax_python_devel_optional; then
	+ AC_MSG_ERROR([Giving up])
	+ fi
	+ ax_python_devel_found=no
	+ PYTHON_VERSION=""
	+ fi
	fi

	#
	# all done!
	#
	])

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