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	diff --git a/CMakeLists.txt b/CMakeLists.txt
	index a0aaea871e..334a89d51b 100644
	--- a/CMakeLists.txt
	+++ b/CMakeLists.txt
	@@ -1,75 +1,75 @@
	# Copyright (c) 2017 The Bitcoin developers

	cmake_minimum_required(VERSION 3.13)

	set(CMAKE_USER_MAKE_RULES_OVERRIDE
	"${CMAKE_SOURCE_DIR}/cmake/modules/OverrideInitFlags.cmake"
	)

	project(bitcoin-abc
	VERSION 0.21.5
	DESCRIPTION "Bitcoin ABC is a full node implementation of the Bitcoin Cash protocol."
	HOMEPAGE_URL "https://www.bitcoinabc.org"
	)

	# Package information
	set(PACKAGE_NAME "Bitcoin ABC")

	# Copyright
	-set(COPYRIGHT_YEAR 2019)
	+set(COPYRIGHT_YEAR 2020)
	set(COPYRIGHT_HOLDERS "The %s developers")
	set(COPYRIGHT_HOLDERS_SUBSTITUTION Bitcoin)
	string(REPLACE "%s" ${COPYRIGHT_HOLDERS_SUBSTITUTION} COPYRIGHT_HOLDERS_FINAL ${COPYRIGHT_HOLDERS})

	# Add path for custom modules
	list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules)

	# Make contrib script accessible.
	set(CONTRIB_PATH ${CMAKE_CURRENT_SOURCE_DIR}/contrib)

	# Default to RelWithDebInfo configuration
	if(NOT CMAKE_BUILD_TYPE)
	set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING
	"Select the configuration for the build" FORCE)
	endif()

	# Find the python interpreter. This is required for several targets.
	find_package(Python 3.5 COMPONENTS Interpreter REQUIRED)

	# Add the magic targets `check-*`
	add_custom_target(check-all)
	add_custom_target(check)
	add_custom_target(check-extended)
	add_custom_target(check-upgrade-activated)
	add_custom_target(check-upgrade-activated-extended)

	include(PackageHelper)
	exclude_git_ignored_files_from_source_package()

	# Ignore hidden files and directories (starting with a '.')
	set_property(GLOBAL APPEND PROPERTY SOURCE_PACKAGE_IGNORE_FILES "/\\\\.")

	# If the build is out-of-tree, then the build directory can be ignored.
	if(NOT CMAKE_BINARY_DIR STREQUAL CMAKE_SOURCE_DIR)
	set_property(GLOBAL APPEND PROPERTY SOURCE_PACKAGE_IGNORE_FILES
	"${CMAKE_BINARY_DIR}/"
	)
	endif()

	exclude_from_source_package(
	# Subdirectories
	"arcanist/"
	"depends/"

	# Files
	"[^.]+[.]md$"
	"Dockerfile-doxygen"
	)

	add_subdirectory(src)
	add_subdirectory(test)

	add_subdirectory(contrib)
	add_subdirectory(doc)

	include(PackageOptions.cmake)
	diff --git a/configure.ac b/configure.ac
	index 3759fff386..6922ebfc1a 100644
	--- a/configure.ac
	+++ b/configure.ac
	@@ -1,1450 +1,1450 @@
	dnl require autoconf 2.60 (AS_ECHO/AS_ECHO_N)
	AC_PREREQ([2.60])
	define(_CLIENT_VERSION_MAJOR, 0)
	define(_CLIENT_VERSION_MINOR, 21)
	define(_CLIENT_VERSION_REVISION, 5)
	define(_CLIENT_VERSION_IS_RELEASE, true)
	-define(_COPYRIGHT_YEAR, 2019)
	+define(_COPYRIGHT_YEAR, 2020)
	define(_COPYRIGHT_HOLDERS,[The %s developers])
	define(_COPYRIGHT_HOLDERS_SUBSTITUTION,[[Bitcoin]])
	AC_INIT([Bitcoin ABC],[_CLIENT_VERSION_MAJOR._CLIENT_VERSION_MINOR._CLIENT_VERSION_REVISION],[https://github.com/Bitcoin-ABC/bitcoin-abc/issues],[bitcoin-abc],[https://bitcoinabc.org/])
	AC_CONFIG_SRCDIR([src/validation.cpp])
	AC_CONFIG_HEADERS([src/config/bitcoin-config.h])
	AC_CONFIG_AUX_DIR([build-aux])
	AC_CONFIG_MACRO_DIR([build-aux/m4])

	BITCOIN_DAEMON_NAME=bitcoind
	BITCOIN_GUI_NAME=bitcoin-qt
	BITCOIN_CLI_NAME=bitcoin-cli
	BITCOIN_TX_NAME=bitcoin-tx
	BITCOIN_SEEDER_NAME=bitcoin-seeder

	dnl Unless the user specified ARFLAGS, force it to be cr
	AC_ARG_VAR(ARFLAGS, [Flags for the archiver, defaults to <cr> if not set])
	if test "x${ARFLAGS+set}" != "xset"; then
	ARFLAGS="cr"
	fi

	AC_CANONICAL_HOST

	AH_TOP([#ifndef BITCOIN_BITCOIN_CONFIG_H])
	AH_TOP([#define BITCOIN_BITCOIN_CONFIG_H])
	AH_BOTTOM([#endif // BITCOIN_BITCOIN_CONFIG_H])

	dnl faketime breaks configure and is only needed for make. Disable it here.
	unset FAKETIME

	dnl Automake init set-up and checks
	AM_INIT_AUTOMAKE([no-define subdir-objects foreign])

	dnl faketime messes with timestamps and causes configure to be re-run.
	dnl --disable-maintainer-mode can be used to bypass this.
	AM_MAINTAINER_MODE([enable])

	dnl make the compilation flags quiet unless V=1 is used
	m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

	dnl Compiler checks (here before libtool).
	if test "x${CXXFLAGS+set}" = "xset"; then
	CXXFLAGS_overridden=yes
	else
	CXXFLAGS_overridden=no
	fi
	AC_PROG_CXX

	dnl By default, libtool for mingw refuses to link static libs into a dll for
	dnl fear of mixing pic/non-pic objects, and import/export complications. Since
	dnl we have those under control, re-enable that functionality.
	case $host in
	mingw)
	lt_cv_deplibs_check_method="pass_all"
	;;
	esac
	dnl Require C++14 compiler (no GNU extensions)
	AX_CXX_COMPILE_STDCXX([14], [noext], [mandatory], [nodefault])
	dnl Check if -latomic is required for <std::atomic>
	CHECK_ATOMIC

	dnl Unless the user specified OBJCXX, force it to be the same as CXX. This ensures
	dnl that we get the same -std flags for both.
	m4_ifdef([AC_PROG_OBJCXX],[
	if test "x${OBJCXX+set}" = "x"; then
	OBJCXX="${CXX}"
	fi
	AC_PROG_OBJCXX
	])

	dnl Libtool init checks.
	LT_INIT([pic-only])

	dnl Check/return PATH for base programs.
	AC_PATH_TOOL(AR, ar)
	AC_PATH_TOOL(RANLIB, ranlib)
	AC_PATH_TOOL(STRIP, strip)
	AC_PATH_TOOL(GCOV, gcov)
	AC_PATH_PROG(LCOV, lcov)
	dnl Python 3.x is supported from 3.5
	AC_PATH_PROGS([PYTHON], [python3.8 python3.7 python3.6 python3.5 python3 python])
	AC_PATH_PROG(GENHTML, genhtml)
	AC_PATH_PROG([GIT], [git])
	AC_PATH_PROG(CCACHE,ccache)
	AC_PATH_PROG(XGETTEXT,xgettext)
	AC_PATH_PROG(HEXDUMP,hexdump)
	AC_PATH_TOOL(READELF, readelf)
	AC_PATH_TOOL(CPPFILT, c++filt)
	AC_PATH_TOOL(OBJCOPY, objcopy)

	AC_ARG_VAR(PYTHONPATH, Augments the default search path for python module files)

	AC_ARG_ENABLE([wallet],
	[AS_HELP_STRING([--disable-wallet],
	[disable wallet (enabled by default)])],
	[enable_wallet=$enableval],
	[enable_wallet=yes])

	AC_ARG_WITH([miniupnpc],
	[AS_HELP_STRING([--with-miniupnpc],
	[enable UPNP (default is yes if libminiupnpc is found)])],
	[use_upnp=$withval],
	[use_upnp=auto])

	AC_ARG_ENABLE([upnp-default],
	[AS_HELP_STRING([--enable-upnp-default],
	[if UPNP is enabled, turn it on at startup (default is no)])],
	[use_upnp_default=$enableval],
	[use_upnp_default=no])

	AC_ARG_ENABLE(tests,
	AS_HELP_STRING([--disable-tests],[do not compile tests (default is to compile)]),
	[use_tests=$enableval],
	[use_tests=yes])

	AC_ARG_ENABLE(gui-tests,
	AS_HELP_STRING([--disable-gui-tests],[do not compile GUI tests (default is to compile if GUI and tests enabled)]),
	[use_gui_tests=$enableval],
	[use_gui_tests=$use_tests])

	AC_ARG_WITH([rapidcheck],
	[AS_HELP_STRING([--with-rapidcheck],
	[enable RapidCheck property-based tests (default is yes if librapidcheck is found)])],
	[use_rapidcheck=$withval],
	[use_rapidcheck=auto])

	AC_ARG_ENABLE(bench,
	AS_HELP_STRING([--disable-bench],[do not compile benchmarks (default is to compile)]),
	[use_bench=$enableval],
	[use_bench=yes])

	AC_ARG_ENABLE([extended-functional-tests],
	AS_HELP_STRING([--enable-extended-functional-tests],[enable expensive functional tests when using lcov (default no)]),
	[use_extended_functional_tests=$enableval],
	[use_extended_functional_tests=no])

	AC_ARG_ENABLE([fuzz],
	AS_HELP_STRING([--enable-fuzz],[enable building of fuzz targets (default no)]),
	[enable_fuzz=$enableval],
	[enable_fuzz=no])

	AC_ARG_WITH([qrencode],
	[AS_HELP_STRING([--with-qrencode],
	[enable QR code support (default is yes if qt is enabled and libqrencode is found)])],
	[use_qr=$withval],
	[use_qr=auto])

	AC_ARG_ENABLE([hardening],
	[AS_HELP_STRING([--disable-hardening],
	[do not attempt to harden the resulting executables (default is to harden when possible)])],
	[use_hardening=$enableval],
	[use_hardening=auto])

	AC_ARG_ENABLE([reduce-exports],
	[AS_HELP_STRING([--enable-reduce-exports],
	[attempt to reduce exported symbols in the resulting executables (default is no)])],
	[use_reduce_exports=$enableval],
	[use_reduce_exports=no])

	AC_ARG_ENABLE([ccache],
	[AS_HELP_STRING([--disable-ccache],
	[do not use ccache for building (default is to use if found)])],
	[use_ccache=$enableval],
	[use_ccache=auto])

	AC_ARG_ENABLE([lcov],
	[AS_HELP_STRING([--enable-lcov],
	[enable lcov testing (default is no)])],
	[use_lcov=$enableval],
	[use_lcov=no])

	AC_ARG_ENABLE([lcov-branch-coverage],
	[AS_HELP_STRING([--enable-lcov-branch-coverage],
	[enable lcov testing branch coverage (default is no)])],
	[use_lcov_branch=yes],
	[use_lcov_branch=no])

	AC_ARG_ENABLE([glibc-back-compat],
	[AS_HELP_STRING([--enable-glibc-back-compat],
	[enable backwards compatibility with glibc])],
	[use_glibc_compat=$enableval],
	[use_glibc_compat=no])

	AC_ARG_ENABLE([asm],
	[AS_HELP_STRING([--enable-asm],
	[Enable assembly routines (default is yes)])],
	[use_asm=$enableval],
	[use_asm=yes])

	if test "x$use_asm" = xyes; then
	AC_DEFINE(USE_ASM, 1, [Define this symbol to build in assembly routines])
	fi

	AC_ARG_WITH([system-univalue],
	[AS_HELP_STRING([--with-system-univalue],
	[Build with system UniValue (default is no)])],
	[system_univalue=$withval],
	[system_univalue=no]
	)
	AC_ARG_ENABLE([zmq],
	[AS_HELP_STRING([--disable-zmq],
	[disable ZMQ notifications])],
	[use_zmq=$enableval],
	[use_zmq=yes])
	AC_ARG_ENABLE([bip70],
	[AS_HELP_STRING([--disable-bip70],
	[disable BIP70 (payment protocol) support in GUI (enabled by default)])],
	[enable_bip70=$enableval],
	[enable_bip70=yes])

	AC_ARG_WITH([protoc-bindir],[AS_HELP_STRING([--with-protoc-bindir=BIN_DIR],[specify protoc bin path])], [protoc_bin_path=$withval], [])

	AC_ARG_ENABLE(man,
	[AS_HELP_STRING([--disable-man],
	[do not install man pages (default is to install)])],,
	enable_man=yes)
	AM_CONDITIONAL(ENABLE_MAN, test "$enable_man" != no)

	# Enable debug
	AC_ARG_ENABLE([debug],
	[AS_HELP_STRING([--enable-debug],
	[use compiler flags and macros suited for debugging (default is no)])],
	[enable_debug=$enableval],
	[enable_debug=no])

	# Enable gprof profiling
	AC_ARG_ENABLE([gprof],
	[AS_HELP_STRING([--enable-gprof],
	[use gprof profiling compiler flags (default is no)])],
	[enable_gprof=$enableval],
	[enable_gprof=no])

	# Enable different -fsanitize options
	AC_ARG_WITH([sanitizers],
	[AS_HELP_STRING([--with-sanitizers],
	[comma separated list of extra sanitizers to build with (default is none enabled)])],
	[use_sanitizers=$withval])

	# Turn warnings into errors
	AC_ARG_ENABLE([werror],
	[AS_HELP_STRING([--enable-werror],
	[Treat certain compiler warnings as errors (default is no)])],
	[enable_werror=$enableval],
	[enable_werror=no])

	AC_LANG_PUSH([C++])
	AX_CHECK_COMPILE_FLAG([-Werror],[CXXFLAG_WERROR="-Werror"],[CXXFLAG_WERROR=""])

	if test "x$enable_debug" = xyes; then
	# Clear default -g -O2 flags
	if test "x$CXXFLAGS_overridden" = xno; then
	CXXFLAGS=""
	fi

	# Disable all optimizations
	AX_CHECK_COMPILE_FLAG([-O0], [[DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -O0"]],,[[$CXXFLAG_WERROR]])

	# Prefer -g3, fall back to -g if that is unavailable.
	AX_CHECK_COMPILE_FLAG(
	[-g3],
	[[DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -g3"]],
	[AX_CHECK_COMPILE_FLAG([-g],[[DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -g"]],,[[$CXXFLAG_WERROR]])],
	[[$CXXFLAG_WERROR]])

	AX_CHECK_PREPROC_FLAG([-DDEBUG],[[DEBUG_CPPFLAGS="$DEBUG_CPPFLAGS -DDEBUG"]],,[[$CXXFLAG_WERROR]])
	AX_CHECK_PREPROC_FLAG([-DDEBUG_LOCKORDER],[[DEBUG_CPPFLAGS="$DEBUG_CPPFLAGS -DDEBUG_LOCKORDER"]],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-ftrapv],[DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -ftrapv"],,[[$CXXFLAG_WERROR]])
	fi

	if test x$use_sanitizers != x; then
	# First check if the compiler accepts flags. If an incompatible pair like
	# -fsanitize=address,thread is used here, this check will fail. This will also
	# fail if a bad argument is passed, e.g. -fsanitize=undfeined
	AX_CHECK_COMPILE_FLAG(
	[[-fsanitize=$use_sanitizers]],
	[[SANITIZER_CXXFLAGS=-fsanitize=$use_sanitizers]],
	[AC_MSG_ERROR([compiler did not accept requested flags])])

	# Some compilers (e.g. GCC) require additional libraries like libasan,
	# libtsan, libubsan, etc. Make sure linking still works with the sanitize
	# flag. This is a separate check so we can give a better error message when
	# the sanitize flags are supported by the compiler but the actual sanitizer
	# libs are missing.
	AX_CHECK_LINK_FLAG(
	[[-fsanitize=$use_sanitizers]],
	[[SANITIZER_LDFLAGS=-fsanitize=$use_sanitizers]],
	[AC_MSG_ERROR([linker did not accept requested flags, you are missing required libraries])],
	[],
	[AC_LANG_PROGRAM([[
	#include <cstdint>
	#include <cstddef>
	extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { return 0; }
	__attribute__((weak)) // allow for libFuzzer linking
	]],[[]])])
	fi

	ERROR_CXXFLAGS=
	if test "x$enable_werror" = "xyes"; then
	if test "x$CXXFLAG_WERROR" = "x"; then
	AC_MSG_ERROR("enable-werror set but -Werror is not usable")
	fi
	AX_CHECK_COMPILE_FLAG([-Werror=vla],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=vla"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Werror=thread-safety-analysis],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=thread-safety-analysis"],,[[$CXXFLAG_WERROR]])
	fi

	if test "x$CXXFLAGS_overridden" = "xno"; then
	AX_CHECK_COMPILE_FLAG([-Wall],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wall"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wextra],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wextra"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wformat],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wformat"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wvla],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wvla"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wformat-security],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wformat-security"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wthread-safety-analysis],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wthread-safety-analysis"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wshadow],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wshadow"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wmissing-braces],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wmissing-braces"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wrange-loop-analysis],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wrange-loop-analysis"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wredundant-decls],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wredundant-decls"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wredundant-move],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wredundant-move"],,[[$CXXFLAG_WERROR]])

	## Some compilers (gcc) ignore unknown -Wno-* options, but warn about all
	## unknown options if any other warning is produced. Test the -Wfoo case, and
	## set the -Wno-foo case if it works.
	AX_CHECK_COMPILE_FLAG([-Wunused-parameter],[NOWARN_CXXFLAGS="$NOWARN_CXXFLAGS -Wno-unused-parameter"],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough],[NOWARN_CXXFLAGS="$NOWARN_CXXFLAGS -Wno-implicit-fallthrough"],,[[$CXXFLAG_WERROR]])
	fi

	# Check for optional instruction set support. Enabling these does _not_ imply that all code will
	# be compiled with them, rather that specific objects/libs may use them after checking for runtime
	# compatibility.
	AX_CHECK_COMPILE_FLAG([-msse4.2],[[SSE42_CXXFLAGS="-msse4.2"]],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-msse4.1],[[SSE41_CXXFLAGS="-msse4.1"]],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-mavx -mavx2],[[AVX2_CXXFLAGS="-mavx -mavx2"]],,[[$CXXFLAG_WERROR]])
	AX_CHECK_COMPILE_FLAG([-msse4 -msha],[[SHANI_CXXFLAGS="-msse4 -msha"]],,[[$CXXFLAG_WERROR]])

	TEMP_CXXFLAGS="$CXXFLAGS"
	CXXFLAGS="$CXXFLAGS $SSE42_CXXFLAGS"
	AC_MSG_CHECKING(for assembler crc32 support)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <stdint.h>
	#if defined(_MSC_VER)
	#include <intrin.h>
	#elif defined(__GNUC__) && defined(__SSE4_2__)
	#include <nmmintrin.h>
	#endif
	]],[[
	uint64_t l = 0;
	l = _mm_crc32_u8(l, 0);
	l = _mm_crc32_u32(l, 0);
	l = _mm_crc32_u64(l, 0);
	return l;
	]])],
	[ AC_MSG_RESULT(yes); enable_hwcrc32=yes],
	[ AC_MSG_RESULT(no)]
	)
	CXXFLAGS="$TEMP_CXXFLAGS"

	TEMP_CXXFLAGS="$CXXFLAGS"
	CXXFLAGS="$CXXFLAGS $SSE41_CXXFLAGS"
	AC_MSG_CHECKING(for SSE4.1 intrinsics)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <stdint.h>
	#include <immintrin.h>
	]],[[
	__m128i l = _mm_set1_epi32(0);
	return _mm_extract_epi32(l, 3);
	]])],
	[ AC_MSG_RESULT(yes); enable_sse41=yes; AC_DEFINE(ENABLE_SSE41, 1, [Define this symbol to build code that uses SSE4.1 intrinsics]) ],
	[ AC_MSG_RESULT(no)]
	)
	CXXFLAGS="$TEMP_CXXFLAGS"

	TEMP_CXXFLAGS="$CXXFLAGS"
	CXXFLAGS="$CXXFLAGS $AVX2_CXXFLAGS"
	AC_MSG_CHECKING(for AVX2 intrinsics)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <stdint.h>
	#include <immintrin.h>
	]],[[
	__m256i l = _mm256_set1_epi32(0);
	return _mm256_extract_epi32(l, 7);
	]])],
	[ AC_MSG_RESULT(yes); enable_avx2=yes; AC_DEFINE(ENABLE_AVX2, 1, [Define this symbol to build code that uses AVX2 intrinsics]) ],
	[ AC_MSG_RESULT(no)]
	)
	CXXFLAGS="$TEMP_CXXFLAGS"

	TEMP_CXXFLAGS="$CXXFLAGS"
	CXXFLAGS="$CXXFLAGS $SHANI_CXXFLAGS"
	AC_MSG_CHECKING(for SHA-NI intrinsics)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <stdint.h>
	#include <immintrin.h>
	]],[[
	__m128i i = _mm_set1_epi32(0);
	__m128i j = _mm_set1_epi32(1);
	__m128i k = _mm_set1_epi32(2);
	return _mm_extract_epi32(_mm_sha256rnds2_epu32(i, i, k), 0);
	]])],
	[ AC_MSG_RESULT(yes); enable_shani=yes; AC_DEFINE(ENABLE_SHANI, 1, [Define this symbol to build code that uses SHA-NI intrinsics]) ],
	[ AC_MSG_RESULT(no)]
	)
	CXXFLAGS="$TEMP_CXXFLAGS"

	CPPFLAGS="$CPPFLAGS -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS"

	AC_ARG_WITH([utils],
	[AS_HELP_STRING([--with-utils],
	[build bitcoin-cli bitcoin-tx (default=yes)])],
	[build_bitcoin_utils=$withval],
	[build_bitcoin_utils=yes])

	AC_ARG_WITH([libs],
	[AS_HELP_STRING([--with-libs],
	[build libraries (default=yes)])],
	[build_bitcoin_libs=$withval],
	[build_bitcoin_libs=yes])

	AC_ARG_WITH([daemon],
	[AS_HELP_STRING([--with-daemon],
	[build bitcoind daemon (default=yes)])],
	[build_bitcoind=$withval],
	[build_bitcoind=yes])

	AC_ARG_WITH([seeder],
	[AS_HELP_STRING([--with-seeder],
	[build seeder (default=yes)])],
	[build_bitcoin_seeder=$withval],
	[build_bitcoin_seeder=yes])

	use_pkgconfig=yes
	case $host in
	mingw)

	#pkgconfig does more harm than good with MinGW
	use_pkgconfig=no

	TARGET_OS=windows
	AC_CHECK_LIB([mingwthrd], [main],, AC_MSG_ERROR(libmingwthrd missing))
	AC_CHECK_LIB([kernel32], [main],, AC_MSG_ERROR(libkernel32 missing))
	AC_CHECK_LIB([user32], [main],, AC_MSG_ERROR(libuser32 missing))
	AC_CHECK_LIB([gdi32], [main],, AC_MSG_ERROR(libgdi32 missing))
	AC_CHECK_LIB([comdlg32], [main],, AC_MSG_ERROR(libcomdlg32 missing))
	AC_CHECK_LIB([winspool], [main],, AC_MSG_ERROR(libwinspool missing))
	AC_CHECK_LIB([winmm], [main],, AC_MSG_ERROR(libwinmm missing))
	AC_CHECK_LIB([shell32], [main],, AC_MSG_ERROR(libshell32 missing))
	AC_CHECK_LIB([comctl32], [main],, AC_MSG_ERROR(libcomctl32 missing))
	AC_CHECK_LIB([ole32], [main],, AC_MSG_ERROR(libole32 missing))
	AC_CHECK_LIB([oleaut32], [main],, AC_MSG_ERROR(liboleaut32 missing))
	AC_CHECK_LIB([uuid], [main],, AC_MSG_ERROR(libuuid missing))
	AC_CHECK_LIB([rpcrt4], [main],, AC_MSG_ERROR(librpcrt4 missing))
	AC_CHECK_LIB([advapi32], [main],, AC_MSG_ERROR(libadvapi32 missing))
	AC_CHECK_LIB([ws2_32], [main],, AC_MSG_ERROR(libws2_32 missing))
	AC_CHECK_LIB([mswsock], [main],, AC_MSG_ERROR(libmswsock missing))
	AC_CHECK_LIB([shlwapi], [main],, AC_MSG_ERROR(libshlwapi missing))
	AC_CHECK_LIB([iphlpapi], [main],, AC_MSG_ERROR(libiphlpapi missing))
	AC_CHECK_LIB([crypt32], [main],, AC_MSG_ERROR(libcrypt32 missing))

	# -static is interpreted by libtool, where it has a different meaning.
	# In libtool-speak, it's -all-static.
	AX_CHECK_LINK_FLAG([[-static]],[LIBTOOL_APP_LDFLAGS="$LIBTOOL_APP_LDFLAGS -all-static"])

	AC_PATH_PROG([MAKENSIS], [makensis], none)
	if test x$MAKENSIS = xnone; then
	AC_MSG_WARN("makensis not found. Cannot create installer.")
	fi

	AC_PATH_TOOL(WINDRES, windres, none)
	if test x$WINDRES = xnone; then
	AC_MSG_ERROR("windres not found")
	fi

	CPPFLAGS="$CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB"
	LEVELDB_TARGET_FLAGS="-DOS_WINDOWS"
	if test "x$CXXFLAGS_overridden" = "xno"; then
	CXXFLAGS="$CXXFLAGS -w"
	fi
	case $host in
	i?86-*) WINDOWS_BITS=32 ;;
	x86_64-*) WINDOWS_BITS=64 ;;
	*) AC_MSG_ERROR("Could not determine win32/win64 for installer") ;;
	esac
	AC_SUBST(WINDOWS_BITS)

	dnl libtool insists upon adding -nostdlib and a list of objects/libs to link against.
	dnl That breaks our ability to build dll's with static libgcc/libstdc++/libssp. Override
	dnl its command here, with the predeps/postdeps removed, and -static inserted. Postdeps are
	dnl also overridden to prevent their insertion later.
	dnl This should only affect dll's.
	archive_cmds_CXX="\$CC -shared \$libobjs \$deplibs \$compiler_flags -static -o \$output_objdir/\$soname \${wl}--enable-auto-image-base -Xlinker --out-implib -Xlinker \$lib"
	postdeps_CXX=

	;;
	darwin)
	TARGET_OS=darwin
	LEVELDB_TARGET_FLAGS="-DOS_MACOSX"
	if test x$cross_compiling != xyes; then
	BUILD_OS=darwin
	AC_CHECK_PROG([PORT],port, port)
	if test x$PORT = xport; then
	dnl add default macports paths
	CPPFLAGS="$CPPFLAGS -isystem /opt/local/include"
	LIBS="$LIBS -L/opt/local/lib"
	if test -d /opt/local/include/db48; then
	CPPFLAGS="$CPPFLAGS -I/opt/local/include/db48"
	LIBS="$LIBS -L/opt/local/lib/db48"
	fi
	fi

	AC_PATH_PROGS([RSVG_CONVERT], [rsvg-convert rsvg],rsvg-convert)
	AC_CHECK_PROG([BREW],brew, brew)
	if test x$BREW = xbrew; then
	dnl These Homebrew packages may be keg-only, meaning that they won't be found
	dnl in expected paths because they may conflict with system files. Ask
	dnl Homebrew where each one is located, then adjust paths accordingly.
	dnl It's safe to add these paths even if the functionality is disabled by
	dnl the user (--without-wallet or --without-gui for example).

	openssl_prefix=`$BREW --prefix openssl 2>/dev/null`
	bdb_prefix=`$BREW --prefix berkeley-db 2>/dev/null`
	qt5_prefix=`$BREW --prefix qt5 2>/dev/null`
	if test x$openssl_prefix != x; then
	PKG_CONFIG_PATH="$openssl_prefix/lib/pkgconfig:$PKG_CONFIG_PATH"
	export PKG_CONFIG_PATH
	fi
	if test x$bdb_prefix != x; then
	CPPFLAGS="$CPPFLAGS -I$bdb_prefix/include"
	LIBS="$LIBS -L$bdb_prefix/lib"
	fi
	if test x$qt5_prefix != x; then
	PKG_CONFIG_PATH="$qt5_prefix/lib/pkgconfig:$PKG_CONFIG_PATH"
	export PKG_CONFIG_PATH
	fi
	fi
	else
	case $build_os in
	darwin)
	BUILD_OS=darwin
	;;
	*)
	AC_PATH_TOOL([INSTALLNAMETOOL], [install_name_tool], install_name_tool)
	AC_PATH_TOOL([OTOOL], [otool], otool)
	AC_PATH_PROGS([GENISOIMAGE], [genisoimage mkisofs],genisoimage)
	AC_PATH_PROGS([RSVG_CONVERT], [rsvg-convert rsvg],rsvg-convert)
	AC_PATH_PROGS([IMAGEMAGICK_CONVERT], [convert],convert)
	AC_PATH_PROGS([TIFFCP], [tiffcp],tiffcp)

	dnl libtool will try to strip the static lib, which is a problem for
	dnl cross-builds because strip attempts to call a hard-coded ld,
	dnl which may not exist in the path. Stripping the .a is not
	dnl necessary, so just disable it.
	old_striplib=
	;;
	esac
	fi

	AX_CHECK_LINK_FLAG([[-Wl,-headerpad_max_install_names]], [LDFLAGS="$LDFLAGS -Wl,-headerpad_max_install_names"])
	CPPFLAGS="$CPPFLAGS -DMAC_OSX -DOBJC_OLD_DISPATCH_PROTOTYPES=0"
	OBJCXXFLAGS="$CXXFLAGS"
	;;
	android)
	dnl make sure android stays above linux for hosts like linux-android
	LEVELDB_TARGET_FLAGS="-DOS_ANDROID"
	;;
	linux)
	TARGET_OS=linux
	LEVELDB_TARGET_FLAGS="-DOS_LINUX"
	;;
	kfreebsd)
	LEVELDB_TARGET_FLAGS="-DOS_KFREEBSD"
	;;
	freebsd)
	LEVELDB_TARGET_FLAGS="-DOS_FREEBSD"
	;;
	openbsd)
	LEVELDB_TARGET_FLAGS="-DOS_OPENBSD"
	;;
	netbsd)
	LEVELDB_TARGET_FLAGS="-DOS_NETBSD"
	;;
	dragonfly)
	LEVELDB_TARGET_FLAGS="-DOS_DRAGONFLYBSD"
	;;
	solaris)
	LEVELDB_TARGET_FLAGS="-DOS_SOLARIS"
	;;
	hpux)
	LEVELDB_TARGET_FLAGS="-DOS_HPUX"
	;;
	*)
	AC_MSG_ERROR(Cannot build leveldb for $host. Please file a bug report.)
	;;
	esac

	if test x$use_pkgconfig = xyes; then
	m4_ifndef([PKG_PROG_PKG_CONFIG], [AC_MSG_ERROR(PKG_PROG_PKG_CONFIG macro not found. Please install pkg-config and re-run autogen.sh.)])
	m4_ifdef([PKG_PROG_PKG_CONFIG], [
	PKG_PROG_PKG_CONFIG
	if test x"$PKG_CONFIG" = "x"; then
	AC_MSG_ERROR(pkg-config not found.)
	fi
	])
	fi

	if test x$use_extended_functional_tests != xno; then
	AC_SUBST(EXTENDED_FUNCTIONAL_TESTS, --extended)
	fi

	if test x$use_lcov = xyes; then
	if test x$LCOV = x; then
	AC_MSG_ERROR("lcov testing requested but lcov not found")
	fi
	if test x$GCOV = x; then
	AC_MSG_ERROR("lcov testing requested but gcov not found")
	fi
	if test x$PYTHON = x; then
	AC_MSG_ERROR("lcov testing requested but python not found")
	fi
	if test x$GENHTML = x; then
	AC_MSG_ERROR("lcov testing requested but genhtml not found")
	fi
	LCOV="$LCOV --gcov-tool=$GCOV"
	AX_CHECK_LINK_FLAG([[--coverage]], [LDFLAGS="$LDFLAGS --coverage"],
	[AC_MSG_ERROR("lcov testing requested but --coverage linker flag does not work")])
	AX_CHECK_COMPILE_FLAG([--coverage],[CXXFLAGS="$CXXFLAGS --coverage"],
	[AC_MSG_ERROR("lcov testing requested but --coverage flag does not work")])
	AC_DEFINE(USE_COVERAGE, 1, [Define this symbol if coverage is enabled])
	CXXFLAGS="$CXXFLAGS -Og"
	fi

	if test x$use_lcov_branch != xno; then
	AC_SUBST(LCOV_OPTS, "$LCOV_OPTS --rc lcov_branch_coverage=1")
	fi

	dnl Check for endianness
	AC_C_BIGENDIAN

	dnl Check for pthread compile/link requirements
	AX_PTHREAD

	# Check for Large File Supprot before AC_SYS_LARGEFILE gets called as it will
	# change the output.
	AC_MSG_CHECKING(for if LFS is enabled)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
	#include <type_traits>]],
	[[ static_assert(sizeof(off_t) == 8, ""); ]])],
	[ AC_MSG_RESULT(yes); need_wrap_fcntl=no; AC_DEFINE(HAVE_LARGE_FILE_SUPPORT, 1,[Define this symbol if LFS is enabled]) ],
	[ AC_MSG_RESULT(no); need_wrap_fcntl=yes]
	)

	# The following macro will add the necessary defines to bitcoin-config.h, but
	# they also need to be passed down to any subprojects. Pull the results out of
	# the cache and add them to CPPFLAGS.
	AC_SYS_LARGEFILE
	# detect POSIX or GNU variant of strerror_r
	AC_FUNC_STRERROR_R

	if test x$ac_cv_sys_file_offset_bits != x &&
	test x$ac_cv_sys_file_offset_bits != xno &&
	test x$ac_cv_sys_file_offset_bits != xunknown; then
	CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits"
	fi

	if test x$ac_cv_sys_large_files != x &&
	test x$ac_cv_sys_large_files != xno &&
	test x$ac_cv_sys_large_files != xunknown; then
	CPPFLAGS="$CPPFLAGS -D_LARGE_FILES=$ac_cv_sys_large_files"
	fi

	AX_CHECK_LINK_FLAG([[-Wl,--large-address-aware]], [LDFLAGS="$LDFLAGS -Wl,--large-address-aware"])

	AX_GCC_FUNC_ATTRIBUTE([visibility])
	AX_GCC_FUNC_ATTRIBUTE([dllexport])
	AX_GCC_FUNC_ATTRIBUTE([dllimport])

	if test x$use_glibc_compat != xno; then

	#glibc absorbed clock_gettime in 2.17. librt (its previous location) is safe to link
	#in anyway for back-compat.
	AC_CHECK_LIB([rt],[clock_gettime],, AC_MSG_ERROR(librt missing))

	#__fdelt_chk's params and return type have changed from long unsigned int to long int.
	# See which one is present here.
	AC_MSG_CHECKING(__fdelt_chk type)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#ifdef _FORTIFY_SOURCE
	#undef _FORTIFY_SOURCE
	#endif
	#define _FORTIFY_SOURCE 2
	#include <sys/select.h>
	extern "C" long unsigned int __fdelt_warn(long unsigned int);]],[[]])],
	[ fdelt_type="long unsigned int"],
	[ fdelt_type="long int"])
	AC_MSG_RESULT($fdelt_type)
	AC_DEFINE_UNQUOTED(FDELT_TYPE, $fdelt_type,[parameter and return value type for __fdelt_chk])
	AX_CHECK_LINK_FLAG([[-Wl,--wrap=__divmoddi4]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=__divmoddi4"])
	AX_CHECK_LINK_FLAG([[-Wl,--wrap=log2f]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=log2f"])
	if test x$need_wrap_fcntl = xyes; then
	AX_CHECK_LINK_FLAG([[-Wl,--wrap=fcntl]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=fcntl"])
	AX_CHECK_LINK_FLAG([[-Wl,--wrap=fcntl64]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=fcntl64"])
	fi
	else
	AC_SEARCH_LIBS([clock_gettime],[rt])
	fi

	if test "x$enable_gprof" = xyes; then
	dnl -pg is incompatible with -pie. Since hardening and profiling together doesn't make sense,
	dnl we simply make them mutually exclusive here. Additionally, hardened toolchains may force
	dnl -pie by default, in which case it needs to be turned off with -no-pie.

	if test x$use_hardening = xyes; then
	AC_MSG_ERROR(gprof profiling is not compatible with hardening. Reconfigure with --disable-hardening or --disable-gprof)
	fi
	use_hardening=no
	AX_CHECK_COMPILE_FLAG([-pg],[GPROF_CXXFLAGS="-pg"],
	[AC_MSG_ERROR(gprof profiling requested but not available)], [[$CXXFLAG_WERROR]])

	AX_CHECK_LINK_FLAG([[-no-pie]], [GPROF_LDFLAGS="-no-pie"])
	AX_CHECK_LINK_FLAG([[-pg]],[GPROF_LDFLAGS="$GPROF_LDFLAGS -pg"],
	[AC_MSG_ERROR(gprof profiling requested but not available)], [[$GPROF_LDFLAGS]])
	fi

	if test x$TARGET_OS != xwindows; then
	# All windows code is PIC, forcing it on just adds useless compile warnings
	AX_CHECK_COMPILE_FLAG([-fPIC],[PIC_FLAGS="-fPIC"])
	fi

	# All versions of gcc that we commonly use for building are subject to bug
	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90348. To work around that, set
	# -fstack-reuse=none for all gcc builds. (Only gcc understands this flag)
	AX_CHECK_COMPILE_FLAG([-fstack-reuse=none],[HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -fstack-reuse=none"])
	if test x$use_hardening != xno; then
	use_hardening=yes
	AX_CHECK_COMPILE_FLAG([-Wstack-protector],[HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -Wstack-protector"])
	AX_CHECK_COMPILE_FLAG([-fstack-protector-all],[HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -fstack-protector-all"])

	AX_CHECK_PREPROC_FLAG([-D_FORTIFY_SOURCE=2],[
	AX_CHECK_PREPROC_FLAG([-U_FORTIFY_SOURCE],[
	HARDENED_CPPFLAGS="$HARDENED_CPPFLAGS -U_FORTIFY_SOURCE"
	])
	HARDENED_CPPFLAGS="$HARDENED_CPPFLAGS -D_FORTIFY_SOURCE=2"
	])

	AX_CHECK_LINK_FLAG([[-Wl,--dynamicbase]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--dynamicbase"])
	AX_CHECK_LINK_FLAG([[-Wl,--nxcompat]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--nxcompat"])
	AX_CHECK_LINK_FLAG([[-Wl,--high-entropy-va]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--high-entropy-va"])
	AX_CHECK_LINK_FLAG([[-Wl,-z,relro]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-z,relro"])
	AX_CHECK_LINK_FLAG([[-Wl,-z,now]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-z,now"])

	if test x$TARGET_OS != xwindows; then
	AX_CHECK_COMPILE_FLAG([-fPIE],[PIE_FLAGS="-fPIE"])
	AX_CHECK_LINK_FLAG([[-pie]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -pie"])
	fi

	case $host in
	mingw)
	AC_CHECK_LIB([ssp], [main],, AC_MSG_ERROR(libssp missing))
	;;
	esac
	fi

	dnl this flag screws up non-darwin gcc even when the check fails. special-case it.
	if test x$TARGET_OS = xdarwin; then
	AX_CHECK_LINK_FLAG([[-Wl,-dead_strip]], [LDFLAGS="$LDFLAGS -Wl,-dead_strip"])
	AX_CHECK_LINK_FLAG([[-Wl,-dead_strip_dylibs]], [LDFLAGS="$LDFLAGS -Wl,-dead_strip_dylibs"])
	fi

	AC_CHECK_HEADERS([endian.h sys/endian.h byteswap.h stdio.h stdlib.h unistd.h strings.h sys/types.h sys/stat.h sys/select.h sys/prctl.h])

	AC_CHECK_DECLS([getifaddrs, freeifaddrs],,,
	[#include <sys/types.h>
	#include <ifaddrs.h>]
	)
	AC_CHECK_DECLS([strnlen])

	# Check for daemon(3), unrelated to --with-daemon (although used by it)
	AC_CHECK_DECLS([daemon])

	AC_CHECK_DECLS([le16toh, le32toh, le64toh, htole16, htole32, htole64, be16toh, be32toh, be64toh, htobe16, htobe32, htobe64],,,
	[#if HAVE_ENDIAN_H
	#include <endian.h>
	#elif HAVE_SYS_ENDIAN_H
	#include <sys/endian.h>
	#endif])

	AC_CHECK_DECLS([bswap_16, bswap_32, bswap_64],,,
	[#if HAVE_BYTESWAP_H
	#include <byteswap.h>
	#endif])

	AC_CHECK_DECLS([__builtin_clz, __builtin_clzl, __builtin_clzll, __builtin_popcount])

	dnl Check for mallopt(M_ARENA_MAX) (to set glibc arenas)
	AC_MSG_CHECKING(for mallopt M_ARENA_MAX)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <malloc.h>]],
	[[ mallopt(M_ARENA_MAX, 1); ]])],
	[ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_MALLOPT_ARENA_MAX, 1,[Define this symbol if you have mallopt with M_ARENA_MAX]) ],
	[ AC_MSG_RESULT(no)]
	)

	dnl Check for malloc_info (for memory statistics information in getmemoryinfo)
	AC_MSG_CHECKING(for getmemoryinfo)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <malloc.h>]],
	[[ int f = malloc_info(0, NULL); ]])],
	[ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_MALLOC_INFO, 1,[Define this symbol if you have malloc_info]) ],
	[ AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING([for visibility attribute])
	AC_LINK_IFELSE([AC_LANG_SOURCE([
	int foo_def( void ) __attribute__((visibility("default")));
	int main(){}
	])],
	[
	AC_DEFINE(HAVE_VISIBILITY_ATTRIBUTE,1,[Define if the visibility attribute is supported.])
	AC_MSG_RESULT(yes)
	],
	[
	AC_MSG_RESULT(no)
	if test x$use_reduce_exports = xyes; then
	AC_MSG_ERROR([Cannot find a working visibility attribute. Use --disable-reduce-exports.])
	fi
	]
	)

	# Check for different ways of gathering OS randomness
	AC_MSG_CHECKING(for Linux getrandom syscall)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>
	#include <sys/syscall.h>
	#include <linux/random.h>]],
	[[ syscall(SYS_getrandom, nullptr, 32, 0); ]])],
	[ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYS_GETRANDOM, 1,[Define this symbol if the Linux getrandom system call is available]) ],
	[ AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING(for getentropy)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>]],
	[[ getentropy(nullptr, 32) ]])],
	[ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_GETENTROPY, 1,[Define this symbol if the BSD getentropy system call is available]) ],
	[ AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING(for getentropy via random.h)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>
	#include <sys/random.h>]],
	[[ getentropy(nullptr, 32) ]])],
	[ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_GETENTROPY_RAND, 1,[Define this symbol if the BSD getentropy system call is available with sys/random.h]) ],
	[ AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING(for sysctl KERN_ARND)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
	#include <sys/sysctl.h>]],
	[[ static const int name[2] = {CTL_KERN, KERN_ARND};
	sysctl(name, 2, nullptr, nullptr, nullptr, 0); ]])],
	[ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYSCTL_ARND, 1,[Define this symbol if the BSD sysctl(KERN_ARND) is available]) ],
	[ AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING(for if type char equals int8_t)
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdint.h>
	#include <type_traits>]],
	[[ static_assert(std::is_same<int8_t, char>::value, ""); ]])],
	[ AC_MSG_RESULT(yes); AC_DEFINE(CHAR_EQUALS_INT8, 1,[Define this symbol if type char equals int8_t]) ],
	[ AC_MSG_RESULT(no)]
	)

	# Check for reduced exports
	if test x$use_reduce_exports = xyes; then
	AX_CHECK_COMPILE_FLAG([-fvisibility=hidden],[RE_CXXFLAGS="-fvisibility=hidden"],
	[AC_MSG_ERROR([Cannot set default symbol visibility. Use --disable-reduce-exports.])])
	fi

	LEVELDB_CPPFLAGS=
	LIBLEVELDB=
	LIBMEMENV=
	AM_CONDITIONAL([EMBEDDED_LEVELDB],[true])
	AC_SUBST(LEVELDB_CPPFLAGS)
	AC_SUBST(LIBLEVELDB)
	AC_SUBST(LIBMEMENV)

	if test x$enable_wallet != xno; then
	dnl Check for libdb_cxx only if wallet enabled
	BITCOIN_FIND_BDB53
	fi

	dnl Check for libminiupnpc (optional)
	if test x$use_upnp != xno; then
	AC_CHECK_HEADERS(
	[miniupnpc/miniwget.h miniupnpc/miniupnpc.h miniupnpc/upnpcommands.h miniupnpc/upnperrors.h],
	[AC_CHECK_LIB([miniupnpc], [upnpDiscover], [MINIUPNPC_LIBS=-lminiupnpc], [have_miniupnpc=no])],
	[have_miniupnpc=no]
	)
	fi

	BITCOIN_QT_INIT

	dnl sets $bitcoin_enable_qt, $bitcoin_enable_qt_test, $bitcoin_enable_qt_dbus
	BITCOIN_QT_CONFIGURE([$use_pkgconfig])

	if test x$build_bitcoin_utils$build_bitcoind$bitcoin_enable_qt$build_bitcoin_seeder$use_tests$use_bench = xnononononono; then
	use_boost=no
	else
	use_boost=yes
	fi

	if test x$use_boost = xyes; then

	dnl Minimum required Boost version
	define(MINIMUM_REQUIRED_BOOST, 1.58.0)

	dnl Check for boost libs
	AX_BOOST_BASE([MINIMUM_REQUIRED_BOOST])
	if test x$want_boost = xno; then
	AC_MSG_ERROR([[only libbitcoinconsensus can be built without boost]])
	fi
	AX_BOOST_SYSTEM
	AX_BOOST_FILESYSTEM
	AX_BOOST_THREAD
	AX_BOOST_CHRONO

	dnl Boost 1.56 through 1.62 allow using std::atomic instead of its own atomic
	dnl counter implementations. In 1.63 and later the std::atomic approach is default.
	m4_pattern_allow(DBOOST_AC_USE_STD_ATOMIC) dnl otherwise it's treated like a macro
	BOOST_CPPFLAGS="-DBOOST_SP_USE_STD_ATOMIC -DBOOST_AC_USE_STD_ATOMIC $BOOST_CPPFLAGS"
	fi

	if test x$use_reduce_exports = xyes; then
	CXXFLAGS="$CXXFLAGS $RE_CXXFLAGS"
	AX_CHECK_LINK_FLAG([[-Wl,--exclude-libs,ALL]], [RELDFLAGS="-Wl,--exclude-libs,ALL"])
	fi

	if test x$use_tests = xyes; then

	if test x$HEXDUMP = x; then
	AC_MSG_ERROR(hexdump is required for tests)
	fi


	if test x$use_boost = xyes; then

	AX_BOOST_UNIT_TEST_FRAMEWORK

	dnl Determine if -DBOOST_TEST_DYN_LINK is needed
	AC_MSG_CHECKING([for dynamic linked boost test])
	TEMP_LIBS="$LIBS"
	LIBS="$LIBS $BOOST_LDFLAGS $BOOST_UNIT_TEST_FRAMEWORK_LIB"
	TEMP_CPPFLAGS="$CPPFLAGS"
	CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
	AC_LINK_IFELSE([AC_LANG_SOURCE([
	#define BOOST_TEST_DYN_LINK
	#define BOOST_TEST_MAIN
	#include <boost/test/unit_test.hpp>

	])],
	[AC_MSG_RESULT(yes)]
	[TESTDEFS="$TESTDEFS -DBOOST_TEST_DYN_LINK"],
	[AC_MSG_RESULT(no)])
	LIBS="$TEMP_LIBS"
	CPPFLAGS="$TEMP_CPPFLAGS"

	fi
	fi

	if test x$use_boost = xyes; then
	BOOST_LIBS="$BOOST_LDFLAGS $BOOST_SYSTEM_LIB $BOOST_FILESYSTEM_LIB $BOOST_THREAD_LIB $BOOST_CHRONO_LIB"
	fi

	if test x$use_pkgconfig = xyes; then
	: dnl
	m4_ifdef(
	[PKG_CHECK_MODULES],
	[
	PKG_CHECK_MODULES([SSL], [libssl],, [AC_MSG_ERROR(openssl not found.)])
	PKG_CHECK_MODULES([CRYPTO], [libcrypto],,[AC_MSG_ERROR(libcrypto not found.)])
	if test x$enable_bip70 != xno; then
	BITCOIN_QT_CHECK([PKG_CHECK_MODULES([PROTOBUF], [protobuf], [have_protobuf=yes], [BITCOIN_QT_FAIL(libprotobuf not found)])])
	fi
	if test x$use_qr != xno; then
	BITCOIN_QT_CHECK([PKG_CHECK_MODULES([QR], [libqrencode], [have_qrencode=yes], [have_qrencode=no])])
	fi
	if test x$build_bitcoin_utils$build_bitcoind$bitcoin_enable_qt$use_tests != xnononono; then
	PKG_CHECK_MODULES([EVENT], [libevent],, [AC_MSG_ERROR(libevent not found.)])
	if test x$TARGET_OS != xwindows; then
	PKG_CHECK_MODULES([EVENT_PTHREADS], [libevent_pthreads],, [AC_MSG_ERROR(libevent_pthreads not found.)])
	fi
	fi

	if test "x$use_zmq" = "xyes"; then
	PKG_CHECK_MODULES([ZMQ],[libzmq >= 4],
	[AC_DEFINE([ENABLE_ZMQ],[1],[Define to 1 to enable ZMQ functions])],
	[AC_DEFINE([ENABLE_ZMQ],[0],[Define to 1 to enable ZMQ functions])
	AC_MSG_WARN([libzmq version 4.x or greater not found, disabling])
	use_zmq=no])
	else
	AC_DEFINE_UNQUOTED([ENABLE_ZMQ],[0],[Define to 1 to enable ZMQ functions])
	fi
	]
	)
	else
	AC_CHECK_HEADER([openssl/crypto.h],,AC_MSG_ERROR(libcrypto headers missing))
	AC_CHECK_LIB([crypto], [main],CRYPTO_LIBS=-lcrypto, AC_MSG_ERROR(libcrypto missing))

	AC_CHECK_HEADER([openssl/ssl.h],, AC_MSG_ERROR(libssl headers missing),)
	AC_CHECK_LIB([ssl], [main],SSL_LIBS=-lssl, AC_MSG_ERROR(libssl missing))

	if test x$build_bitcoin_utils$build_bitcoind$bitcoin_enable_qt$use_tests != xnononono; then
	AC_CHECK_HEADER([event2/event.h],, AC_MSG_ERROR(libevent headers missing),)
	AC_CHECK_LIB([event],[main],EVENT_LIBS=-levent,AC_MSG_ERROR(libevent missing))
	if test x$TARGET_OS != xwindows; then
	AC_CHECK_LIB([event_pthreads],[main],EVENT_PTHREADS_LIBS=-levent_pthreads,AC_MSG_ERROR(libevent_pthreads missing))
	fi
	fi

	if test "x$use_zmq" = "xyes"; then
	AC_CHECK_HEADER([zmq.h],
	[AC_DEFINE([ENABLE_ZMQ],[1],[Define to 1 to enable ZMQ functions])],
	[AC_MSG_WARN([zmq.h not found, disabling zmq support])
	use_zmq=no
	AC_DEFINE([ENABLE_ZMQ],[0],[Define to 1 to enable ZMQ functions])])
	AC_CHECK_LIB([zmq],[zmq_ctx_shutdown],ZMQ_LIBS=-lzmq,
	[AC_MSG_WARN([libzmq >= 4.0 not found, disabling zmq support])
	use_zmq=no
	AC_DEFINE([ENABLE_ZMQ],[0],[Define to 1 to enable ZMQ functions])])
	else
	AC_DEFINE_UNQUOTED([ENABLE_ZMQ],[0],[Define to 1 to enable ZMQ functions])
	fi

	if test "x$use_zmq" = "xyes"; then
	dnl Assume libzmq was built for static linking
	case $host in
	mingw)
	ZMQ_CFLAGS="$ZMQ_CFLAGS -DZMQ_STATIC"
	;;
	esac
	fi

	if test x$enable_bip70 != xno; then
	BITCOIN_QT_CHECK(AC_CHECK_LIB([protobuf] ,[main],[PROTOBUF_LIBS=-lprotobuf], BITCOIN_QT_FAIL(libprotobuf not found)))
	fi
	if test x$use_qr != xno; then
	BITCOIN_QT_CHECK([AC_CHECK_LIB([qrencode], [main],[QR_LIBS=-lqrencode], [have_qrencode=no])])
	BITCOIN_QT_CHECK([AC_CHECK_HEADER([qrencode.h],, have_qrencode=no)])
	fi
	fi

	save_CXXFLAGS="${CXXFLAGS}"
	CXXFLAGS="${CXXFLAGS} ${CRYPTO_CFLAGS} ${SSL_CFLAGS}"
	AC_CHECK_DECLS([EVP_MD_CTX_new],,,[AC_INCLUDES_DEFAULT
	#include <openssl/x509_vfy.h>
	])
	CXXFLAGS="${save_CXXFLAGS}"

	dnl RapidCheck property-based testing

	enable_property_tests=no
	if test "x$use_rapidcheck" = xauto; then
	AC_CHECK_HEADERS([rapidcheck.h], [enable_property_tests=yes])
	elif test "x$use_rapidcheck" != xno; then
	enable_property_tests=yes
	fi

	RAPIDCHECK_LIBS=
	if test "x$enable_property_tests" = xyes; then
	RAPIDCHECK_LIBS=-lrapidcheck
	fi
	AC_SUBST(RAPIDCHECK_LIBS)
	AM_CONDITIONAL([ENABLE_PROPERTY_TESTS], [test x$enable_property_tests = xyes])

	dnl univalue check

	need_bundled_univalue=yes

	if test x$build_bitcoin_utils$build_bitcoind$bitcoin_enable_qt$use_tests$use_bench = xnonononono; then
	need_bundled_univalue=no
	else

	if test x$system_univalue != xno ; then
	found_univalue=no
	if test x$use_pkgconfig = xyes; then
	: #NOP
	m4_ifdef(
	[PKG_CHECK_MODULES],
	[
	PKG_CHECK_MODULES([UNIVALUE],[libunivalue >= 1.0.4],[found_univalue=yes],[true])
	]
	)
	else
	AC_CHECK_HEADER([univalue.h],[
	AC_CHECK_LIB([univalue], [main],[
	UNIVALUE_LIBS=-lunivalue
	found_univalue=yes
	],[true])
	],[true])
	fi

	if test x$found_univalue = xyes ; then
	system_univalue=yes
	need_bundled_univalue=no
	elif test x$system_univalue = xyes ; then
	AC_MSG_ERROR([univalue not found])
	else
	system_univalue=no
	fi
	fi

	if test x$need_bundled_univalue = xyes ; then
	UNIVALUE_CFLAGS='-I$(srcdir)/univalue/include'
	UNIVALUE_LIBS='univalue/libunivalue.la'
	fi

	fi

	AM_CONDITIONAL([EMBEDDED_UNIVALUE],[test x$need_bundled_univalue = xyes])
	AC_SUBST(UNIVALUE_CFLAGS)
	AC_SUBST(UNIVALUE_LIBS)

	if test x$enable_bip70 != xno; then
	BITCOIN_QT_PATH_PROGS([PROTOC], [protoc],$protoc_bin_path)
	fi

	AC_MSG_CHECKING([whether to build bitcoind])
	AM_CONDITIONAL([BUILD_BITCOIND], [test x$build_bitcoind = xyes])
	AC_MSG_RESULT($build_bitcoind)

	AC_MSG_CHECKING([whether to build bitcoin-seeder])
	AM_CONDITIONAL([BUILD_BITCOIN_SEEDER], [test x$build_bitcoin_seeder = xyes])
	AC_MSG_RESULT($build_bitcoin_seeder)

	AC_MSG_CHECKING([whether to build utils (bitcoin-cli bitcoin-tx)])
	AM_CONDITIONAL([BUILD_BITCOIN_UTILS], [test x$build_bitcoin_utils = xyes])
	AC_MSG_RESULT($build_bitcoin_utils)

	AC_MSG_CHECKING([whether to build libraries])
	AM_CONDITIONAL([BUILD_BITCOIN_LIBS], [test x$build_bitcoin_libs = xyes])
	if test x$build_bitcoin_libs = xyes; then
	AC_DEFINE(HAVE_CONSENSUS_LIB, 1, [Define this symbol if the consensus lib has been built])
	AC_CONFIG_FILES([libbitcoinconsensus.pc:libbitcoinconsensus.pc.in])
	fi
	AC_MSG_RESULT($build_bitcoin_libs)

	AC_LANG_POP

	if test "x$use_ccache" != "xno"; then
	AC_MSG_CHECKING(if ccache should be used)
	if test x$CCACHE = x; then
	if test "x$use_ccache" = "xyes"; then
	AC_MSG_ERROR([ccache not found.]);
	else
	use_ccache=no
	fi
	else
	use_ccache=yes
	CC="$ac_cv_path_CCACHE $CC"
	CXX="$ac_cv_path_CCACHE $CXX"
	fi
	AC_MSG_RESULT($use_ccache)
	fi
	if test "x$use_ccache" = "xyes"; then
	AX_CHECK_PREPROC_FLAG([-Qunused-arguments],[CPPFLAGS="-Qunused-arguments $CPPFLAGS"])
	fi

	dnl enable wallet
	AC_MSG_CHECKING([if wallet should be enabled])
	if test x$enable_wallet != xno; then
	AC_MSG_RESULT(yes)
	AC_DEFINE_UNQUOTED([ENABLE_WALLET],[1],[Define to 1 to enable wallet functions])

	else
	AC_MSG_RESULT(no)
	fi

	dnl enable upnp support
	AC_MSG_CHECKING([whether to build with support for UPnP])
	if test x$have_miniupnpc = xno; then
	if test x$use_upnp = xyes; then
	AC_MSG_ERROR("UPnP requested but cannot be built. use --without-miniupnpc")
	fi
	AC_MSG_RESULT(no)
	else
	if test x$use_upnp != xno; then
	AC_MSG_RESULT(yes)
	AC_MSG_CHECKING([whether to build with UPnP enabled by default])
	use_upnp=yes
	upnp_setting=0
	if test x$use_upnp_default != xno; then
	use_upnp_default=yes
	upnp_setting=1
	fi
	AC_MSG_RESULT($use_upnp_default)
	AC_DEFINE_UNQUOTED([USE_UPNP],[$upnp_setting],[UPnP support not compiled if undefined, otherwise value (0 or 1) determines default state])
	if test x$TARGET_OS = xwindows; then
	MINIUPNPC_CPPFLAGS="-DSTATICLIB -DMINIUPNP_STATICLIB"
	fi
	else
	AC_MSG_RESULT(no)
	fi
	fi

	dnl these are only used when qt is enabled
	BUILD_TEST_QT=""
	if test x$bitcoin_enable_qt != xno; then
	dnl enable dbus support
	AC_MSG_CHECKING([whether to build GUI with support for D-Bus])
	if test x$bitcoin_enable_qt_dbus != xno; then
	AC_DEFINE([USE_DBUS],[1],[Define if dbus support should be compiled in])
	fi
	AC_MSG_RESULT($bitcoin_enable_qt_dbus)

	dnl enable qr support
	AC_MSG_CHECKING([whether to build GUI with support for QR codes])
	if test x$have_qrencode = xno; then
	if test x$use_qr = xyes; then
	AC_MSG_ERROR("QR support requested but cannot be built. use --without-qrencode")
	fi
	AC_MSG_RESULT(no)
	else
	if test x$use_qr != xno; then
	AC_MSG_RESULT(yes)
	AC_DEFINE([USE_QRCODE],[1],[Define if QR support should be compiled in])
	use_qr=yes
	else
	AC_MSG_RESULT(no)
	fi
	fi

	if test x$XGETTEXT = x; then
	AC_MSG_WARN("xgettext is required to update qt translations")
	fi

	AC_MSG_CHECKING([whether to build test_bitcoin-qt])
	if test x$use_gui_tests$bitcoin_enable_qt_test = xyesyes; then
	AC_MSG_RESULT([yes])
	BUILD_TEST_QT="yes"
	else
	AC_MSG_RESULT([no])
	fi

	AC_MSG_CHECKING([whether to build BIP70 support])
	if test x$enable_bip70 != xno; then
	AC_DEFINE([ENABLE_BIP70],[1],[Define if BIP70 support should be compiled in])
	enable_bip70=yes
	AC_MSG_RESULT([yes])
	else
	AC_MSG_RESULT([no])
	fi
	fi

	AM_CONDITIONAL([ENABLE_ZMQ], [test "x$use_zmq" = "xyes"])

	AC_MSG_CHECKING([whether to build test_bitcoin])
	if test x$use_tests = xyes; then
	AC_MSG_RESULT([yes])
	BUILD_TEST="yes"
	else
	AC_MSG_RESULT([no])
	BUILD_TEST=""
	fi

	AC_MSG_CHECKING([whether to build test_bitcoin-seeder])
	if test x$build_bitcoin_seeder$use_tests = xyesyes; then
	AC_MSG_RESULT([yes])
	BUILD_SEEDER_TEST="yes"
	else
	AC_MSG_RESULT([no])
	BUILD_SEEDER_TEST=""
	fi

	AC_MSG_CHECKING([whether to reduce exports])
	if test x$use_reduce_exports = xyes; then
	AC_MSG_RESULT([yes])
	else
	AC_MSG_RESULT([no])
	fi

	if test x$build_bitcoin_utils$build_bitcoin_libs$build_bitcoind$bitcoin_enable_qt$use_bench$use_tests = xnononononono; then
	AC_MSG_ERROR([No targets! Please specify at least one of: --with-utils --with-libs --with-daemon --with-seeder --with-gui --enable-bench or --enable-tests])
	fi

	AM_CONDITIONAL([TARGET_DARWIN], [test x$TARGET_OS = xdarwin])
	AM_CONDITIONAL([BUILD_DARWIN], [test x$BUILD_OS = xdarwin])
	AM_CONDITIONAL([TARGET_WINDOWS], [test x$TARGET_OS = xwindows])
	AM_CONDITIONAL([ENABLE_WALLET],[test x$enable_wallet = xyes])
	AM_CONDITIONAL([ENABLE_TESTS],[test x$BUILD_TEST = xyes])
	AM_CONDITIONAL([ENABLE_SEEDER_TESTS],[test x$BUILD_SEEDER_TEST = xyes])
	AM_CONDITIONAL([ENABLE_FUZZ],[test x$enable_fuzz = xyes])
	AM_CONDITIONAL([ENABLE_QT],[test x$bitcoin_enable_qt = xyes])
	AM_CONDITIONAL([ENABLE_QT_TESTS],[test x$BUILD_TEST_QT = xyes])
	AM_CONDITIONAL([ENABLE_BIP70],[test x$enable_bip70 = xyes])
	AM_CONDITIONAL([ENABLE_BENCH],[test x$use_bench = xyes])
	AM_CONDITIONAL([USE_QRCODE], [test x$use_qr = xyes])
	AM_CONDITIONAL([USE_LCOV],[test x$use_lcov = xyes])
	AM_CONDITIONAL([GLIBC_BACK_COMPAT],[test x$use_glibc_compat = xyes])
	AM_CONDITIONAL([HARDEN],[test x$use_hardening = xyes])
	AM_CONDITIONAL([ENABLE_HWCRC32],[test x$enable_hwcrc32 = xyes])
	AM_CONDITIONAL([ENABLE_SSE41],[test x$enable_sse41 = xyes])
	AM_CONDITIONAL([ENABLE_AVX2],[test x$enable_avx2 = xyes])
	AM_CONDITIONAL([ENABLE_SHANI],[test x$enable_shani = xyes])
	AM_CONDITIONAL([USE_ASM],[test x$use_asm = xyes])

	AC_DEFINE(COPYRIGHT_YEAR, _COPYRIGHT_YEAR, [Copyright year])
	AC_DEFINE(COPYRIGHT_HOLDERS, "_COPYRIGHT_HOLDERS", [Copyright holder(s) before %s replacement])
	AC_DEFINE(COPYRIGHT_HOLDERS_SUBSTITUTION, "_COPYRIGHT_HOLDERS_SUBSTITUTION", [Replacement for %s in copyright holders string])
	define(_COPYRIGHT_HOLDERS_FINAL, [patsubst(_COPYRIGHT_HOLDERS, [%s], [_COPYRIGHT_HOLDERS_SUBSTITUTION])])
	AC_DEFINE(COPYRIGHT_HOLDERS_FINAL, "_COPYRIGHT_HOLDERS_FINAL", [Copyright holder(s)])
	AC_SUBST(CLIENT_VERSION_MAJOR, _CLIENT_VERSION_MAJOR)
	AC_SUBST(CLIENT_VERSION_MINOR, _CLIENT_VERSION_MINOR)
	AC_SUBST(CLIENT_VERSION_REVISION, _CLIENT_VERSION_REVISION)
	AC_SUBST(CLIENT_VERSION_IS_RELEASE, _CLIENT_VERSION_IS_RELEASE)
	AC_SUBST(COPYRIGHT_YEAR, _COPYRIGHT_YEAR)
	AC_SUBST(COPYRIGHT_HOLDERS, "_COPYRIGHT_HOLDERS")
	AC_SUBST(COPYRIGHT_HOLDERS_SUBSTITUTION, "_COPYRIGHT_HOLDERS_SUBSTITUTION")
	AC_SUBST(COPYRIGHT_HOLDERS_FINAL, "_COPYRIGHT_HOLDERS_FINAL")
	AC_SUBST(BITCOIN_DAEMON_NAME)
	AC_SUBST(BITCOIN_GUI_NAME)
	AC_SUBST(BITCOIN_CLI_NAME)
	AC_SUBST(BITCOIN_TX_NAME)
	AC_SUBST(BITCOIN_SEEDER_NAME)

	AC_SUBST(RELDFLAGS)
	AC_SUBST(DEBUG_CPPFLAGS)
	AC_SUBST(WARN_CXXFLAGS)
	AC_SUBST(NOWARN_CXXFLAGS)
	AC_SUBST(DEBUG_CXXFLAGS)
	AC_SUBST(COMPAT_LDFLAGS)
	AC_SUBST(ERROR_CXXFLAGS)
	AC_SUBST(GPROF_CXXFLAGS)
	AC_SUBST(GPROF_LDFLAGS)
	AC_SUBST(HARDENED_CXXFLAGS)
	AC_SUBST(HARDENED_CPPFLAGS)
	AC_SUBST(HARDENED_LDFLAGS)
	AC_SUBST(PIC_FLAGS)
	AC_SUBST(PIE_FLAGS)
	AC_SUBST(SANITIZER_CXXFLAGS)
	AC_SUBST(SANITIZER_LDFLAGS)
	AC_SUBST(SSE42_CXXFLAGS)
	AC_SUBST(SSE41_CXXFLAGS)
	AC_SUBST(AVX2_CXXFLAGS)
	AC_SUBST(SHANI_CXXFLAGS)
	AC_SUBST(LIBTOOL_APP_LDFLAGS)
	AC_SUBST(USE_UPNP)
	AC_SUBST(USE_QRCODE)
	AC_SUBST(BOOST_LIBS)
	AC_SUBST(TESTDEFS)
	AC_SUBST(LEVELDB_TARGET_FLAGS)
	AC_SUBST(MINIUPNPC_CPPFLAGS)
	AC_SUBST(MINIUPNPC_LIBS)
	AC_SUBST(CRYPTO_LIBS)
	AC_SUBST(SSL_LIBS)
	AC_SUBST(EVENT_LIBS)
	AC_SUBST(EVENT_PTHREADS_LIBS)
	AC_SUBST(ZMQ_LIBS)
	AC_SUBST(PROTOBUF_LIBS)
	AC_SUBST(QR_LIBS)
	AC_CONFIG_FILES([Makefile src/Makefile doc/man/Makefile share/setup.nsi share/qt/Info.plist test/config.ini])
	AC_CONFIG_FILES([contrib/devtools/split-debug.sh],[chmod +x contrib/devtools/split-debug.sh])
	AC_CONFIG_FILES([doc/Doxyfile])
	AC_CONFIG_FILES([src/config/version.h])
	AC_CONFIG_LINKS([test/functional/test_runner.py:test/functional/test_runner.py])
	AC_CONFIG_LINKS([test/fuzz/test_runner.py:test/fuzz/test_runner.py])
	AC_CONFIG_LINKS([test/util/bitcoin-util-test.py:test/util/bitcoin-util-test.py])
	AC_CONFIG_LINKS([test/util/rpcauth-test.py:test/util/rpcauth-test.py])

	dnl boost's m4 checks do something really nasty: they export these vars. As a
	dnl result, they leak into secp256k1's configure and crazy things happen.
	dnl Until this is fixed upstream and we've synced, we'll just un-export them.
	CPPFLAGS_TEMP="$CPPFLAGS"
	unset CPPFLAGS
	CPPFLAGS="$CPPFLAGS_TEMP"

	LDFLAGS_TEMP="$LDFLAGS"
	unset LDFLAGS
	LDFLAGS="$LDFLAGS_TEMP"

	LIBS_TEMP="$LIBS"
	unset LIBS
	LIBS="$LIBS_TEMP"

	PKGCONFIG_PATH_TEMP="$PKG_CONFIG_PATH"
	unset PKG_CONFIG_PATH
	PKG_CONFIG_PATH="$PKGCONFIG_PATH_TEMP"

	PKGCONFIG_LIBDIR_TEMP="$PKG_CONFIG_LIBDIR"
	unset PKG_CONFIG_LIBDIR
	PKG_CONFIG_LIBDIR="$PKGCONFIG_LIBDIR_TEMP"

	if test x$need_bundled_univalue = xyes; then
	AC_CONFIG_SUBDIRS([src/univalue])
	fi

	ac_configure_args="${ac_configure_args} --disable-shared --with-pic --with-bignum=no --enable-module-recovery --disable-jni"
	AC_CONFIG_SUBDIRS([src/secp256k1])

	AC_OUTPUT

	dnl Taken from https://wiki.debian.org/RpathIssue
	case $host in
	--linux-gnu)
	AC_MSG_RESULT([Fixing libtool for -rpath problems.])
	sed < libtool > libtool-2 \
	's/^hardcode_libdir_flag_spec.*$'/'hardcode_libdir_flag_spec=" -D__LIBTOOL_IS_A_FOOL__ "/'
	mv libtool-2 libtool
	chmod 755 libtool
	;;
	esac

	dnl Replace the BUILDDIR path with the correct Windows path if compiling on Native Windows
	case ${OS} in
	Windows)
	sed 's/BUILDDIR="\/$[[a-z]]$/BUILDDIR="\1:/' test/config.ini > test/config-2.ini
	mv test/config-2.ini test/config.ini
	;;
	esac

	echo
	echo "Options used to compile and link:"
	echo " with wallet = $enable_wallet"
	echo " with gui / qt = $bitcoin_enable_qt"
	if test x$bitcoin_enable_qt != xno; then
	echo " with bip70 = $enable_bip70"
	echo " with qr = $use_qr"
	fi
	echo " with zmq = $use_zmq"
	echo " with test = $use_tests"
	if test x$use_tests != xno; then
	echo " with prop = $enable_property_tests"
	echo " with fuzz = $enable_fuzz"
	fi
	echo " with bench = $use_bench"
	echo " with upnp = $use_upnp"
	echo " use asm = $use_asm"
	echo " sanitizers = $use_sanitizers"
	echo " debug enabled = $enable_debug"
	echo " gprof enabled = $enable_gprof"
	echo " werror = $enable_werror"
	echo
	echo " target os = $TARGET_OS"
	echo " build os = $BUILD_OS"
	echo
	echo " CC = $CC"
	echo " CFLAGS = $CFLAGS"
	echo " CPPFLAGS = $DEBUG_CPPFLAGS $HARDENED_CPPFLAGS $CPPFLAGS"
	echo " CXX = $CXX"
	echo " CXXFLAGS = $DEBUG_CXXFLAGS $HARDENED_CXXFLAGS $WARN_CXXFLAGS $NOWARN_CXXFLAGS $ERROR_CXXFLAGS $CXXFLAGS"
	echo " LDFLAGS = $PTHREAD_CFLAGS $HARDENED_LDFLAGS $LDFLAGS"
	echo " ARFLAGS = $ARFLAGS"
	echo

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