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configure.ac
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# This file is part of GNUnet.
# (C) 2001--2023 GNUnet e.V.
#
# GNUnet is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License,
# or (at your option) any later version.
#
# GNUnet 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
# Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# SPDX-License-Identifier: AGPL3.0-or-later
#
# Process this file with autoconf to produce a configure script.
#
#
AC_PREREQ([2.69])
AC_INIT([gnunet],[m4_esyscmd_s(sh scripts/get_version.sh)],[bug-gnunet@gnu.org])
gnunet_version=m4_esyscmd_s(sh scripts/get_version.sh)
gnunet_major_version=m4_esyscmd_s(sh scripts/get_version.sh --major)
gnunet_minor_version=m4_esyscmd_s(sh scripts/get_version.sh --minor)
gnunet_micro_version=m4_esyscmd_s(sh scripts/get_version.sh --micro)
AC_SUBST([gnunet_version])
AC_SUBST([gnunet_major_version])
AC_SUBST([gnunet_minor_version])
AC_SUBST([gnunet_micro_version])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIRS([m4])
AC_CONFIG_HEADERS([gnunet_private_config.h])
AC_CANONICAL_TARGET
AC_CANONICAL_HOST
AM_INIT_AUTOMAKE([tar-ustar])
AM_SILENT_RULES([yes])
# maybe use AC_USE_SYSTEM_EXTENSIONS?
AH_TOP([#define _GNU_SOURCE 1])
AC_PROG_AWK
AC_PROG_CC
AC_PROG_CC_C_O
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MAKE_SET
AC_PROG_MKDIR_P
PKG_PROG_PKG_CONFIG([0.29.2])
LT_INIT([disable-static dlopen])
AS_IF([test "x$enable_shared" = "xno"],
[AC_MSG_ERROR([GNUnet works only with shared libraries, sorry])])
AS_AUTOTOOLS_ALTERNATE
AC_SYS_LARGEFILE
AC_FUNC_FSEEKO
AC_UNALIGNED_64_ACCESS
# Helper to check cflags for compiler
# CC_CHECK_CFLAGS(FLAG, [ACTION-IF-FOUND, [ACTION-IF-NOT-FOUND]])
AC_DEFUN([CC_CHECK_CFLAGS_SILENT],
[AC_CACHE_VAL([AS_TR_SH([cc_cv_cflags_$1])],
[ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $1 -Werror"
AC_LINK_IFELSE([AC_LANG_SOURCE([int main() { return 0; }])],
[eval "AS_TR_SH([cc_cv_cflags_$1])='yes'"],
[eval "AS_TR_SH([cc_cv_cflags_$1])='no'"])
CFLAGS="$ac_save_CFLAGS"])
AS_IF([eval test "x$]AS_TR_SH([cc_cv_cflags_$1])[" = "xyes"],
[$2],
[$3])
])dnl
# Check for FLAG and append it to CFLAGS if supported
# CC_CHECK_CFLAG_APPEND(FLAG, [ACTION-IF-FOUND, [ACTION-IF-NOT-FOUND]])
AC_DEFUN([CC_CHECK_CFLAG_APPEND],
[AC_CACHE_CHECK([if $CC supports $1],
[AS_TR_SH([cc_cv_cflags_$1])],
[CC_CHECK_CFLAGS_SILENT([$1])])
AS_IF([eval test "x$]AS_TR_SH([cc_cv_cflags_$1])[" = "xyes"],
[CFLAGS="$CFLAGS $1"; $2],
[$3])
])dnl
# Workaround for GCC not doing the proper thing when using a '-Wno' flag.
# Works like CC_CHECK_CFLAG_APPEND except that the '-Wno' prefix is omitted
# (e.g. '-Wno-foo' becomes 'foo')
AC_DEFUN([CC_CHECK_CFLAG_WNO_APPEND],
[AC_CACHE_CHECK([if $CC supports -Wno-$1],
[AS_TR_SH([cc_cv_cflags__W$1])],
[CC_CHECK_CFLAGS_SILENT([-W$1])])
AS_IF([eval test "x$]AS_TR_SH([cc_cv_cflags__W$1])[" = "xyes"],
[CFLAGS="$CFLAGS -Wno-$1"; $2],
[$3])
])dnl
# Use no-strict-aliasing only if the compiler supports it
CC_CHECK_CFLAG_APPEND([-fno-strict-aliasing])
# We make heavy use of these, gcc 9 gives warnings so disable them.
CC_CHECK_CFLAG_WNO_APPEND([address-of-packed-member])
CC_CHECK_CFLAG_WNO_APPEND([tautological-constant-out-of-range-compare])
OLD_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,--unresolved-symbols=report-all"
AS_CASE(["$host_os"],
[*darwin*|*rhapsody*|*macosx*],
[AC_DEFINE([DARWIN],[1],[Define to 1 if this is an Apple Darwin system])
CPPFLAGS="-D_APPLE_C_SOURCE $CPPFLAGS"
CFLAGS="-fno-common -D__APPLE_USE_RFC_3542 $CFLAGS"
LDFLAGS="$OLD_LDFLAGS"
build_target="darwin"
DEFAULT_INTERFACE="\"en0\""
LIBPREFIX=
DLLDIR=lib
UNIXONLY="#"
AC_CHECK_LIB([intl], [gettext])],
[linux*],
[AC_DEFINE([LINUX],[1],[Define to 1 if this is a system with a Linux kernel])
build_target="linux"
DEFAULT_INTERFACE="\"eth0\""
LIBPREFIX=
DLLDIR=lib
UNIXONLY="#"
AC_PATH_XTRA
],
[*freebsd*],
[CFLAGS="-D_THREAD_SAFE $CFLAGS"
build_target="freebsd"
DEFAULT_INTERFACE="\"lo0\""
xbsd="yes"
LIBPREFIX=
DLLDIR=lib
UNIXONLY="#"
],
[*openbsd*],
[AC_DEFINE([OPENBSD],[1],[Define to 1 if this is an OpenBSD system])
# libc needs to be linked explicitly
LDFLAGS="$OLD_LDFLAGS -lc"
# and PIC has to be enabled
CFLAGS="-fPIC $CFLAGS"
build_target="openbsd"
DEFAULT_INTERFACE="\"lo0\""
xbsd="yes"
LIBPREFIX=
DLLDIR=lib
UNIXONLY="#"
],
[*netbsd*],
[build_target="netbsd"
DEFAULT_INTERFACE="\"lo0\""
xbsd="yes"
LIBPREFIX=
DLLDIR=lib
UNIXONLY="#"
],
[*solaris*],
[AC_DEFINE([SOLARIS],[1],[Define to 1 if this is a Solaris system])
AC_DEFINE([_REENTRANT],[1],[Needed with Solaris or errno does not work])
AC_CHECK_LIB([resolv], [res_init])
AC_CHECK_LIB([rt], [nanosleep])
build_target="solaris"
DEFAULT_INTERFACE="\"eth0\""
LIBPREFIX=
DLLDIR=lib
UNIXONLY="#"
],
[*arm-linux*],
[AC_DEFINE([LINUX],[1],[Define to 1 if this is a system with a Linux kernel])
CFLAGS="-D_REENTRANT -fPIC -pipe $CFLAGS"
build_target="linux"
DEFAULT_INTERFACE="\"eth0\""
LIBPREFIX=
DLLDIR=lib
UNIXONLY="#"
],
[gnu*],
[AC_DEFINE([GNU],[1],[Define to 1 if this is a GNU system])
build_target="gnu"
DEFAULT_INTERFACE="\"eth0\""
UNIXONLY="#"
],
[AC_DEFINE([OTHEROS],[1],[Define to 1 if this is some strange OS])
DEFAULT_INTERFACE="\"eth0\""
])
AC_DEFINE_UNQUOTED([GNUNET_DEFAULT_INTERFACE], [$DEFAULT_INTERFACE],
[The default choice for the name of the first network interface])
AC_SUBST([DEFAULT_INTERFACE])
# Disable TCP-based IPC on system supporting UNIX domain sockets
AC_SUBST([UNIXONLY])
AC_MSG_CHECKING([for build target])
AM_CONDITIONAL([DARWIN], [test "$build_target" = "darwin"])
AM_CONDITIONAL([SOLARIS], [test "$build_target" = "solaris"])
AM_CONDITIONAL([XNETBSD], [test "$build_target" = "netbsd"])
AM_CONDITIONAL([XFREEBSD], [test "$build_target" = "freebsd"])
AM_CONDITIONAL([OPENBSD], [test "$build_target" = "openbsd"])
AM_CONDITIONAL([XBSD], [test "x$bsd" = "xyes"])
AM_CONDITIONAL([LINUX], [test "$build_target" = "linux"])
AM_CONDITIONAL([GNU], [test "$build_target" = "gnu"])
AC_MSG_RESULT([$build_target])
AS_IF([test "$build_target" = "darwin"],
[AC_MSG_WARN([The VPN application cannot be compiled on your system])])
AC_SUBST([build_target])
# Other checks for standard libraries
AC_SEARCH_LIBS([gethostbyname], [nsl ws2_32])
AC_SEARCH_LIBS([memchr],[],
[AC_DEFINE([HAVE_MEMCHR],[1],
[Define to 1 if memchr is supported])],
[])
AC_SEARCH_LIBS([memset_s],[],
[AC_DEFINE([HAVE_MEMSET_S],[1],
[Define to 1 if memset_s is supported])],
[])
AC_SEARCH_LIBS([explicit_bzero],[],
[AC_DEFINE([HAVE_EXPLICIT_BZERO],[1],
[Define to 1 if explicit_bzero is supported])],
[])
AC_CHECK_LIB([socket], [socket])
AC_CHECK_LIB([m], [log])
AC_CHECK_FUNCS([getloadavg])
AC_CHECK_PROG([GETOPT_BINARY], [getopt], [true], [false])
AM_CONDITIONAL([HAVE_GETOPT_BINARY], [$GETOPT_BINARY])
AC_CHECK_PROGS([PKG_CONFIG], [pkgconf pkg-config], [false])
AM_CONDITIONAL([HAVE_PKG_CONFIG], [test "x$PKG_CONFIG" != "xfalse"])
AC_CHECK_PROG([SSH_BINARY], [ssh], [true], [false])
AM_CONDITIONAL([HAVE_SSH_BINARY], [$SSH_BINARY])
AC_MSG_CHECKING([for SSH key])
AS_IF([ssh -D 12345 -o "BatchMode Yes" -o "UserKnownHostsFile /tmp/gnunet_test_cosks_ssh_garbage" -o "StrictHostKeyChecking no" 127.0.0.1 echo -n 2>/dev/null],
[has_ssh_key=yes],
[has_ssh_key=no])
AM_CONDITIONAL([HAVE_SSH_KEY], [test "x$has_ssh_key" = "xyes"])
AC_MSG_RESULT([$has_ssh_key])
AS_IF([test -f /tmp/gnunet_test_cosks_ssh_garbage],
[rm -f /tmp/gnunet_test_cosks_ssh_garbage])
AM_PATH_PYTHON([3.4],,[:])
AC_SUBST([PYTHON])
AM_CONDITIONAL([HAVE_PYTHON], [test "$PYTHON" != ':'])
AC_ARG_WITH([perl],
[AS_HELP_STRING([--with-perl=PATH], [Look for Perl in PATH])],
[AS_CASE([$withval],
[no], [AC_MSG_ERROR([Perl is required])],
[yes], [AC_PATH_PROG([PERL], [perl])],
[AC_PATH_PROG([PERL], [perl], [], ["$withval"])])],
[AC_PATH_PROG([PERL], [perl])])
AC_SUBST([PERL])
AM_CONDITIONAL([HAVE_PERL], [test -x "$PERL"])
AS_IF([test -x "$PERL"],
[AC_DEFINE([HAVE_PERL], [1], [Define to 1 if perl is available])],
[AC_DEFINE([HAVE_PERL], [0], [Define to 1 if perl is available])])
AWK_BINARY="$AWK"
AC_SUBST([AWK_BINARY])
AM_CONDITIONAL([HAVE_AWK], [test -x "$AWK_BINARY"])
AS_IF([test -x "$AWK_BINARY"],
[AC_DEFINE([HAVE_AWK], [1], [Define to 1 if awk is available])],
[AC_DEFINE([HAVE_AWK], [0], [Define to 1 if awk is available])])
# check for some LaTeX packages used by gnunet-bcd
CHECK_LATEX_PACKAGE([TikZ], [tikz])
CHECK_LATEX_PACKAGE([QR Code], [qrcode])
CHECK_LATEX_PACKAGE([Labels], [labels])
AM_CONDITIONAL([HAVE_PDFLATEX], [test "x$PDFLATEX_BINARY" != "xno"])
AC_ARG_WITH([gnunet-logread],
[AS_HELP_STRING([--with-gnunet-logread], [Install gnunet-logread])],
[logread=yes],
[logread=no])
AS_IF([test "x$logread" = "xyes"],
[AM_CONDITIONAL([GNUNET_LOGREAD], [true])
AC_DEFINE([GNUNET_LOGREAD], [1],
[Define to 1 if gnunet-logread is available])],
[AM_CONDITIONAL([GNUNET_LOGREAD], [false])
AC_DEFINE([GNUNET_LOGREAD], [0],
[Define to 1 if gnunet-logread is available])])
# iptables is a soft requirement to run tests
AC_PATH_TARGET_TOOL([IPTABLES_BINARY], [iptables], [false])
AS_IF([test "x$IPTABLES_BINARY" = "xfalse"],
[AS_IF([test -x "/sbin/iptables"],
[IPTABLES_BINARY="/sbin/iptables"],
[AS_IF([test -x "/usr/sbin/iptables"],
[IPTABLES_BINARY="/usr/sbin/iptables"])])])
AS_IF([test "x$IPTABLES_BINARY" != "xfalse"],
[AC_DEFINE_UNQUOTED([IPTABLES], ["$IPTABLES_BINARY"], [Path to iptables])],
[AC_MSG_WARN([iptables not found])])
# also check for ip6tables
AC_PATH_TARGET_TOOL([IP6TABLES_BINARY], [ip6tables], [false])
AS_IF([test "x$IP6TABLES_BINARY" = "xfalse"],
[AS_IF([test -x "/sbin/ip6tables"],
[IP6TABLES_BINARY="/sbin/ip6tables"],
[AS_IF([test -x "/usr/sbin/ip6tables"],
[IP6TABLES_BINARY="/usr/sbin/ip6tables"])])])
AS_IF([test "x$IP6TABLES_BINARY" != "xfalse"],
[AC_DEFINE_UNQUOTED([IP6TABLES], ["$IP6TABLES_BINARY"],
[Path to ip6tables])],
[AC_MSG_WARN([ip6tables not found])])
# also check for ip
AC_PATH_TARGET_TOOL([IP_BINARY], [ip], [false])
AS_IF([test "x$IP_BINARY" = "xfalse"],
[AS_IF([test -x "/sbin/ip"],
[IP_BINARY="/sbin/ip"],
[AS_IF([test -x "/usr/sbin/ip"],
[IP_BINARY="/usr/sbin/ip"])])])
AS_IF([test "x$IP_BINARY" != "xfalse"],
[AC_DEFINE_UNQUOTED([PATH_TO_IP], ["$IP_BINARY"], [Path to ip])],
[AC_MSG_WARN([ip not found])])
# locate ifconfig
AC_PATH_TARGET_TOOL([IFCONFIG_BINARY], [ifconfig], [false])
AS_IF([test "x$IFCONFIG_BINARY" = "xfalse"],
[AS_IF([test -x "/sbin/ifconfig"],
[IFCONFIG_BINARY="/sbin/ifconfig"],
[AS_IF([test -x "/usr/sbin/ifconfig"],
[IFCONFIG_BINARY="/usr/sbin/ifconfig"])])])
AS_IF([test "x$IFCONFIG_BINARY" != "xfalse"],
[AC_DEFINE_UNQUOTED([IFCONFIG], ["$IFCONFIG_BINARY"], [Path to ifconfig])],
[AC_MSG_WARN([ifconfig not found])])
AC_PATH_PROG([MSG_USER_SETUP], [adduser], [false])
# test if the 'gnunet' user and groups exist
getent passwd gnunet > /dev/null
HAVE_GNUNET_USER=$?
getent group gnunet > /dev/null
AS_IF([test x$? != x0],
[HAVE_GNUNET_USER=1])
getent group gnunetdns > /dev/null
AS_IF([test x$? != x0],
[HAVE_GNUNET_USER=1])
AC_PATH_TARGET_TOOL([SYSCTL_BINARY], [sysctl], [false])
AS_IF([test "x$SYSCTL_BINARY" = "xfalse"],
[AS_IF([test -x "/sbin/sysctl"],
[SYSCTL_BINARY="/sbin/sysctl"],
[AS_IF([test -x "/usr/sbin/sysctl"],
[SYSCTL_BINARY="/usr/sbin/sysctl"])])])
AS_IF([test "x$SYSCTL_BINARY" != "xfalse"],
[AC_DEFINE_UNQUOTED([SYSCTL], ["$SYSCTL_BINARY"], [Path to sysctl])],
[AC_MSG_WARN([sysctl not found])])
# (mini)upnpc is a soft runtime requirement
AC_PATH_TARGET_TOOL([UPNPC_BINARY], [upnpc], [false])
AS_IF([test "x$UPNPC_BINARY" != "x$false"],
[AC_DEFINE_UNQUOTED([UPNPC], ["$UPNPC_BINARY"], [Path to upnpc binary])],
[AC_MSG_WARN([upnpc binary not found])])
# the following tools might use a flag to specify their path or non-default
# name (e.g. a versioned string instead of simply the program name)
# checkbashisms
AC_CHECK_PROGS([CHECKBASHISMS_BINARY], [checkbashisms checkbashisms.pl], [false])
AM_CONDITIONAL([HAVE_CHECKBASHISMS], [test "x$CHECKBASHISMS_BINARY" != "xfalse"])
# uncrustify
AC_CHECK_PROG([UNCRUSTIFY_BINARY], [uncrustify], [true], [false])
AM_CONDITIONAL([HAVE_UNCRUSTIFY_BINARY], [$UNCRUSTIFY_BINARY])
# yapf
# check only the 'yapf' name for now
AC_CHECK_PROGS([YAPF_BINARY], [yapf], [false])
AM_CONDITIONAL([HAVE_YAPF_BINARY], [test "x$YAPF_BINARY" != "xfalse"])
AC_CHECK_MEMBER([struct tm.tm_gmtoff],
[AC_DEFINE([HAVE_TM_GMTOFF], [1],
[Define to 1 if struct tm has the tm_gmtoff member])],
[],
[#include <time.h>])
# "save" libs; only those libs found so far will be
# linked against _everywhere_. For the others, we
# will be more selective!
SAVE_LIBS=$LIBS
have_addrinfo_a=0
AC_CHECK_LIB([anl], [getaddrinfo_a],
[have_addrinfo_a=1
AC_DEFINE([HAVE_GETADDRINFO_A], [1],
[Define to 1 if getaddrinfo_a is supported])])
AM_CONDITIONAL([HAVE_GETADDRINFO_A], [test "x$have_addrinfo_a" = "x1"])
# libgcrypt
gcrypt=0
gcrypt_api=1
gcrypt_version=1.6.0
AM_PATH_LIBGCRYPT(["$gcrypt_api:$gcrypt_version"], [gcrypt=1])
AC_CHECK_DECLS([gcry_mpi_set_opaque_copy], [], [], [[#include <gcrypt.h>]])
AS_IF([test "$gcrypt" = "0"],
[AC_MSG_ERROR([[You need libgcrypt to build this program.
At least version $gcrypt_version (API $gcrypt_api) is required.]])])
AC_DEFINE_UNQUOTED([NEED_LIBGCRYPT_VERSION], ["$gcrypt_version"],
[Required libgcrypt version])
AC_CHECK_HEADER([if_tun.h],
[AC_DEFINE([IF_TUN_HDR], ["if_tun.h"],
[How to include if_tun.h])
AC_CHECK_DECLS([struct in6_ifreq], [], [],
[[#include <if_tun.h>]])],
[AC_CHECK_HEADER([linux/if_tun.h],
[AC_DEFINE([IF_TUN_HDR], ["linux/if_tun.h"],
[How to include if_tun.h])
AC_CHECK_DECLS([struct in6_ifreq], [], [],
[[#include <linux/if_tun.h>]])],
[AC_CHECK_HEADER([net/if_tun.h],
[AC_DEFINE([IF_TUN_HDR], ["net/if_tun.h"],
[How to include if_tun.h])
AC_CHECK_DECLS([struct in6_ifreq], [], [],
[[#include <net/if_tun.h>]])],
[AC_CHECK_HEADER([net/tun/if_tun.h],
[AC_DEFINE([IF_TUN_HDR], ["net/tun/if_tun.h"],
[How to include if_tun.h])
AC_CHECK_DECLS([struct in6_ifreq], [], [],
[[#include <net/tun/if_tun.h>]])])])])])
# Should documentation be built?
AC_ARG_ENABLE([documentation],
[AS_HELP_STRING([--disable-documentation],
[do not build the documentation])],
[documentation=${enableval}],
[documentation=yes])
AC_CHECK_PROG([DOXY_BINARY], [doxygen], [true], [false])
AM_CONDITIONAL([HAVE_DOXY_BINARY], [$DOXY_BINARY])
AM_CONDITIONAL([DOCUMENTATION], [test "x$documentation" = "xyes"])
AC_CHECK_PROGS([MANDOC_BINARY], [mandoc], [false])
AM_CONDITIONAL([HAVE_MANDOC], [test "x$MANDOC_BINARY" != "xfalse"])
# check if only the documentation should be build
AC_ARG_ENABLE([documentation-only],
[AS_HELP_STRING([--enable-documentation-only],
[build only the documentation])],
[AS_IF([test "x${enableval}" = "xno"],
[documentation_only="0"],
[documentation_only="1"])],
[documentation_only="0"])
AC_DEFINE_UNQUOTED([DOCUMENTATION_ONLY], [$documentation_only],
[Define to 1 if only documentation is being built])
AM_CONDITIONAL([DOCUMENTATION_ONLY], [test "x$documentation_only" = "x1"])
# check if man pages should be included
AC_ARG_ENABLE([include-manpages],
[AS_HELP_STRING([--disable-include-manpages],
[do not include man pages during installation])],
[AS_IF([test "x${enableval}" = "xno"],
[include_man="0"],
[include_man="1"])],
[include_man="1"])
AC_DEFINE_UNQUOTED([INCLUDE_MANPAGES], [$include_man],
[Define to 1 if man pages are included])
AM_CONDITIONAL([INCLUDE_MANPAGES], [test "x$include_man" = "x1"])
# Hardening options
AC_ARG_ENABLE([gcc-hardening],
[AS_HELP_STRING([--enable-gcc-hardening], [enable compiler security checks])],
[AS_IF([test "x$enableval" = "xyes"],
[CFLAGS="$CFLAGS -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-all"
CFLAGS="$CFLAGS -fwrapv -fPIE -Wstack-protector"
CFLAGS="$CFLAGS --param ssp-buffer-size=1"
LDFLAGS="$LDFLAGS -pie"])])
AC_ARG_ENABLE([linker-hardening],
[AS_HELP_STRING([--enable-linker-hardening], [enable linker security options])],
[AS_IF([test "x$enableval" = "xyes"],
[LDFLAGS="$LDFLAGS -z relro -z now"])])
AC_ARG_ENABLE([sanitizer],
[AS_HELP_STRING([--enable-sanitizer],
[enable address and undefined behaviour sanitizers])],
[AS_IF([test "x$enableval" = "xyes"],
[CFLAGS="$CFLAGS -fsanitize=address,undefined -fno-omit-frame-pointer"])])
# Logging
extra_logging=GNUNET_NO
AC_ARG_ENABLE([logging],
[AS_HELP_STRING([--enable-logging@<:@=value@:>@],
[enable logging calls; possible values: yes,no,verbose,veryverbose (default yes)])],
[AS_CASE([$enableval],
[yes],
[extra_logging=GNUNET_NO],
[no],
[extra_logging=GNUNET_NO
AC_DEFINE([GNUNET_CULL_LOGGING], [1],
[Define to 1 to cull all logging calls])],
[verbose],
[extra_logging=GNUNET_YES],
[veryverbose], [extra_logging=\(GNUNET_YES+1\)],
[extra_logging=GNUNET_NO])])
AC_DEFINE_UNQUOTED([GNUNET_EXTRA_LOGGING], [$extra_logging],
[Define to 1 if extra logging is enabled, 2 for very verbose logging])
AC_ARG_ENABLE([poisoning],
[AS_HELP_STRING([--enable-poisoning],
[enable poisoning of freed memory (good for debugging)])],
[enable_poisoning=${enableval}],
[enable_poisoning=missing])
AS_IF([test "x$enable_poisoning" = "xmissing"],
[AS_IF([test "x$extra_logging" != "xGNUNET_NO"],
[enable_poisoning=yes],
[enable_poisoning=no])])
AS_IF([test "x$enable_poisoning" = "xyes"],
[AC_DEFINE([ENABLED_POISONING], [1],
[Define to 1 if freed memory is poisoned])],
[AC_DEFINE([ENABLED_POISONING], [0],
[Define to 1 if freed memory is poisoned])])
AS_IF([test "$build" = "$target"],
[AC_MSG_CHECKING([for a working HMAC])
AC_LANG_PUSH([C])
LIBS="$LIBS $LIBGCRYPT_LIBS"
CFLAGS="$CFLAGS $LIBGCRYPT_CFLAGS"
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([#include <gcrypt.h>],
[[gcry_md_hd_t mac;
unsigned char data[] = {
0xbf, 0x16, 0x6e, 0x46, 0x3a, 0x6c, 0xf3, 0x93, 0xa7, 0x72,
0x11, 0xa1, 0xdc, 0x0b, 0x07, 0xdb, 0x1a, 0x5e, 0xd9, 0xb9, 0x81, 0xbe,
0xea, 0xe4, 0x31, 0x5f, 0x24, 0xff, 0xfe, 0x50, 0x8a, 0xde
};
unsigned char key[] = { 0xfc, 0x62, 0x76, 0x35 };
unsigned char result[] = {
0xa2, 0xb, 0x1, 0xd9, 0xc0, 0x8b, 0x5a, 0x12, 0x80,
0xd5, 0x50, 0x12, 0x8e, 0xd0, 0x5b, 0xb6, 0x5c, 0x87, 0x24, 0xe2, 0xd0,
0xd2, 0xaf, 0x63, 0xae, 0xd1, 0xd6, 0x64, 0x14, 0xe3, 0x6e, 0x61, 0x5b,
0xd, 0xba, 0x17, 0x7d, 0xd3, 0x10, 0xb1, 0x37, 0x41, 0x91, 0x7d, 0xeb,
0x1, 0x4d, 0x71, 0xe8, 0x59, 0x71, 0x42, 0x8e, 0xd6, 0xf3, 0x29, 0x3b,
0x90, 0xf2, 0xd1, 0xaf, 0x65, 0x1e, 0xb3
};
if (!gcry_check_version (GCRYPT_VERSION))
{
return 1;
}
gcry_control (GCRYCTL_DISABLE_SECMEM, 0);
gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
if (gcry_md_open(&mac, GCRY_MD_SHA512, GCRY_MD_FLAG_HMAC) != GPG_ERR_NO_ERROR)
{
return 2;
}
gcry_md_setkey (mac, key, sizeof (key));
gcry_md_write (mac, data, sizeof (data));
if (memcmp(gcry_md_read (mac, 0),
result,
gcry_md_get_algo_dlen (gcry_md_get_algo (mac))) != 0)
{
return 3;
}
gcry_md_close (mac);]])],
[AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])
RESULT=$?
AS_CASE([$RESULT],
[1],
[AC_MSG_FAILURE([libgcrypt header version does not match library])],
[2],
[AC_MSG_FAILURE([HMAC test failed])],
[3],
[AC_MSG_FAILURE([HMAC test vector does not match. This is a known problem with libgcrypt 1.2.2 on Windows and it's fixed in 1.4.6])],
[])],
[AC_MSG_RESULT([cross compiling, test skipped])])
AC_LANG_POP([C])])
dnl Helper function to shorten the amount of repeated code
dnl It will create a --with-<lib> option for configure.
dnl
dnl CHECK_WITH_LIB(LIBNAME, FUNC, HEADER, DEFINE-SYM)
dnl LIBNAME is the name of a library without the 'lib' prefix, e.g. 'bluetooth'
dnl for 'libbluetooth'.
dnl DEFINE-SYM is a symbol to define using AC_DEFINE; it will be set to 1 if the
dnl library is available, 0 otherwise.
dnl
dnl The variable LIBNAME (that is, the identifier passed as the first argument)
dnl is kept with the result: 0 if not available, 1 if available.
dnl For example: CHECK_WITH_LIB(foo, ...) will generate $foo.
AC_DEFUN([CHECK_WITH_LIB],
[AC_ARG_WITH([$1],
[AS_HELP_STRING([--with-][$1][=PFX], [base of lib][$1][ installation])],
[AS_CASE([$withval],
[no],
[eval "AS_TR_SH([$1])=0"],
[yes],
[CHECK_LIBHEADER([m4_translit([$1], [a-z], [A-Z])],
[$1], [$2], [$3],
[eval "AS_TR_SH([$1])=1"],
[eval "AS_TR_SH([$1])=0"])],
[CHECK_LIBHEADER([m4_translit([$1], [a-z], [A-Z])],
[$1], [$2], [$3],
[eval "AS_TR_SH([$1])=1"],
[eval "AS_TR_SH([$1])=0"],
[-L${withval}/lib],
[-I${withval}/include])
AS_IF([test "x$][AS_TR_SH([$1])][" = "x1"],
[EXT_LIB_PATH="-L${withval}/lib $EXT_LIB_PATH"])])],
[CHECK_LIBHEADER([m4_translit([$1], [a-z], [A-Z])],
[$1], [$2], [$3],
[eval "AS_TR_SH([$1])=1"],
[eval "AS_TR_SH([$1])=0"])])
AM_CONDITIONAL([$4], [test "x$][AS_TR_SH([$1])][" = "x1"])
AC_DEFINE_UNQUOTED([$4], [$][AS_TR_SH([$1])], [Define to 1 if available])
])dnl
# check for libbluetooth
CHECK_WITH_LIB([bluetooth],
[ba2str],
[bluetooth/bluetooth.h],
[HAVE_LIBBLUETOOTH])
# check for libzbar
CHECK_WITH_LIB([zbar], [zbar_processor_create], [zbar.h], [HAVE_ZBAR])
# check for libpng library
# this check is for an optional feature of gnunet-qr.
# the PNG format was chosen mostly arbitrarilyy: while it's true that more
# modern formats exists that can be used in stead of PNG, it's also true that
# it's more common for systems to ship with libpng than other codecs; also, a
# black-or-white picture of squares is one of the cases where PNG shines the
# most, so the advantages of other formats becomes less important.
AS_IF([test "x$zbar" = "x1"],
[CHECK_WITH_LIB([png], [png_create_read_struct], [png.h], [HAVE_PNG])],
[AM_CONDITIONAL([HAVE_PNG], [false])
AC_DEFINE([HAVE_PNG], [0], [Define to 1 if libpng is available])])
# check for libpabc
CHECK_WITH_LIB([pabc], [pabc_new_ctx], [pabc/pabc.h], [HAVE_PABC])
# check for jansson
CHECK_WITH_LIB([jansson], [json_loads], [jansson.h], [HAVE_JANSSON])
AS_IF([test "x$jansson" = "x0"],
[AC_MSG_ERROR([GNUnet requires jansson])])
# check for jose
CHECK_WITH_LIB([jose], [jose_jwk_gen], [jose/jose.h], [HAVE_JOSE])
AS_IF([test "x$jose" = "x0"],
[AC_MSG_WARN([reclaimID OpenID Connect plugin requires jose])])
# check for libpulse (pulseaudio)
CHECK_WITH_LIB([pulse], [pa_stream_peek], [pulse/simple.h], [HAVE_PULSE])
# check for libopus
# Note: this might need to be expanded if a more detailed check is needed.
# For example, before CHECK_WITH_LIB was created, it used to look for
# "OPUS_SET_GAIN" in libopus
CHECK_WITH_LIB([opus], [opus_decode_float], [opus/opus.h], [HAVE_OPUS])
# check for libogg
CHECK_WITH_LIB([ogg], [ogg_stream_flush_fill], [ogg/ogg.h], [HAVE_OGG])
PKG_CHECK_MODULES([GST],
[glib-2.0 gobject-2.0 gstreamer-1.0 gstreamer-app-1.0 gstreamer-audio-1.0],
[gst=1],
[gst=0])
# check if conversation can be built and how
AC_MSG_CHECKING([for conversation feature set to build])
AS_IF([test "x$pulse" != "x1" || test "x$opus" != "x1" || test "x$ogg" != "x1"],
[AS_IF([test "x$gst" != "x1"],
[conversation_backend="none"
AM_CONDITIONAL([BUILD_PULSE_HELPERS], [false])
AM_CONDITIONAL([BUILD_GST_HELPERS], [false])
AM_CONDITIONAL([BUILD_EXPERIMENTAL_HELPERS], [false])],
[conversation_backend="gst"
AM_CONDITIONAL([BUILD_PULSE_HELPERS], [false])
AM_CONDITIONAL([BUILD_GST_HELPERS], [true])
AM_CONDITIONAL([BUILD_EXPERIMENTAL_HELPERS], [false])])],
[conversation_backend="pulse"
AM_CONDITIONAL([BUILD_PULSE_HELPERS], [true])
AM_CONDITIONAL([BUILD_GST_HELPERS], [false])
AM_CONDITIONAL([BUILD_EXPERIMENTAL_HELPERS], [false])])
AM_CONDITIONAL([BUILD_CONVERSATION], [test "x$conversation_backend" != "xnone"])
AC_MSG_RESULT([$conversation_backend])
# NOTE: If we find libcurl-gnutls here we set LIBCURL to -lcurl-gnutls
# This affects the LIBCURL_CHECK_CONFIG call below as it takes LIBCURL into
# account when checking for curl.
LIBCURL="-lcurl"
AC_CHECK_LIB([curl-gnutls],
[curl_easy_getinfo],
[LIBCURL="-lcurl-gnutls"])
LIBCURL_CHECK_CONFIG([], [7.85.0], [],
[AC_MSG_ERROR([cURL must have a version >= 7.85.0])])
OLD_LIBS=$LIBS
LIBS="$LIBS $LIBCURL"
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([[#include <curl/curl.h>]],
[[return (CURLSSLSET_OK != curl_global_sslset(CURLSSLBACKEND_GNUTLS, NULL, NULL));]])],
[curl_gnutls=1],
[AC_MSG_WARN([cURL does not have GnuTLS backend])
curl_gnutls=0])
LIBS=$OLD_LIBS
AM_CONDITIONAL([HAVE_GNUTLS_CURL], [test "x$curl_gnutls" = "x1"])
AC_SUBST([curl_gnutls])
# Even if curl is found, we check for this constant in order to determine
# if we can use this feature.
AC_CHECK_HEADER([curl/curl.h],
[AC_CHECK_DECLS([CURLINFO_TLS_SSL_PTR],
[],
[AC_MSG_ERROR([cURL must support CURLINFO_TLS_SSL_PTR])],
[[#include <curl/curl.h>]])])
# check for nss
AC_CHECK_HEADERS([nss.h], [nss=true], [nss=false])
AS_IF([test "x$nss" = "xfalse"],
[AM_CONDITIONAL([HAVE_GLIBCNSS], [false])
AC_MSG_WARN([NSS plugin will not be build])],
[AC_CHECK_DECL([NSS_STATUS_UNAVAIL],
[AM_CONDITIONAL([HAVE_GLIBCNSS], [true])],
[AM_CONDITIONAL([HAVE_GLIBCNSS], [false])
AC_MSG_WARN([NSS plugin will not be built])],
[[#include <nss.h>]])])
# libatomic
AC_SEARCH_LIBS([__atomic_load_8], [atomic])
# test for kvm and kstat (for CPU stats under BSD/Solaris)
AC_CHECK_LIB([kvm], [kvm_open])
AC_CHECK_LIB([kstat], [kstat_open])
# check for libsodium version >= 1.0.18
libsodium=0
CHECK_WITH_LIB([sodium], [crypto_core_ed25519_scalar_mul], [sodium.h], [HAVE_SODIUM])
AS_IF([test "x$sodium" = "x0"],
[AC_MSG_ERROR([GNUnet requires libsodium >= 1.0.18])])
# check for libextractor
CHECK_WITH_LIB([extractor],
[EXTRACTOR_plugin_add_defaults],
[extractor.h],
[HAVE_LIBEXTRACTOR])
AS_IF([test "x$extractor" = "x0"],
[AC_MSG_RESULT([GNU libextractor not found, some features disabled])])
# check for cloudflare-quiche
CHECK_WITH_LIB([quiche],
[quiche_header_info],
[quiche.h],
[HAVE_QUICHE])
AS_IF([test "x$quiche" = "x0"],
[AC_MSG_RESULT([cloudflare-quiche not found, some features disabled])])
# check for libltdl
CHECK_WITH_LIB([ltdl], [lt_dlopenext], [ltdl.h], [HAVE_LTDL])
AS_IF([test "x$ldtl" = "x0"],
[AC_MSG_RESULT([libltdl (from GNU libtool) is required])])
# check for libidn, first version 2 and if not found, version 1
# if both are missing throw an error as libidn is required
AC_ARG_WITH([libidn],
[AS_HELP_STRING([--with-libidn=PFX], [base of libidn/libidn2 installation])],
[libidn=${withval}],
[libidn=yes])
AS_IF([test "x$libidn" = "xno"],
[AC_MSG_ERROR([GNUnet requires libidn or libidn2])])
AS_IF([test "x$libidn" = "xyes"],
[AC_CHECK_HEADERS([idn2.h],
[libidn_version="2"],
[AC_CHECK_HEADERS([idn2/idn2.h],
[libidn_version="2"],
[libidn_version="0"])])],
[LDFLAGS="-L$libidn/lib $LDFLAGS"
CPPFLAGS="-I$libidn/include $CPPFLAGS"
AC_CHECK_HEADERS([idn2.h],
[libidn_version="2"],
[AC_CHECK_HEADERS([idn2/idn2.h],
[libidn_version="2"],
[libidn_version="0"])])])
AS_IF([test "x$libidn_version" = "x0"],
[AS_IF([test "x$libidn" = "xyes"],
[AC_CHECK_HEADERS([idna.h],
[libidn_version="1"],
[AC_CHECK_HEADERS([idn/idna.h],
[libidn_version="1"]
[libidn_version="2"])])],
[LDFLAGS="-L$libidn/lib $LDFLAGS"
CPPFLAGS="-I$libidn/include $CPPFLAGS"
AC_CHECK_HEADERS([idna.h],
[libidn_version="2"],
[AC_CHECK_HEADERS([idn/idna.h],
[libidn_version="2"],
[libidn_version="0"])])])])
AS_IF([test "x$libidn_version" = "x0"],
[AC_MSG_ERROR([GNUnet requires libidn or libidn2])])
AS_IF([test "x$libidn_version" = "x2"],
[AC_CHECK_LIB([idn2], [idn2_to_unicode_8z8z], [libidn_ok=yes], [libidn_ok=no])],
[AC_CHECK_LIB([idn], [idna_to_ascii_8z], [libidn_ok=yes], [libidn_ok=no])])
AS_IF([test "x$libidn_ok" = "xno"],
[AC_MSG_ERROR([GNUnet requires libidn or libidn2])])
AM_CONDITIONAL([HAVE_LIBIDN], [test "x$libidn_version" = "x1"])
AM_CONDITIONAL([HAVE_LIBIDN2], [test "x$libidn_version" = "x2"])
AS_IF([test "x$libidn_version" = "x2"],
[AC_DEFINE([HAVE_LIBIDN2], [1], [Define to 1 if libidn2 is available])],
[AC_DEFINE([HAVE_LIBIDN], [1], [Define to 1 if libidn is available])])
# check for zlib
AC_ARG_WITH([zlib],
[AS_HELP_STRING([--with-zlib=PFX], [base of zlib installation])],
[zlib=${withval}],
[zlib=yes])
AS_IF([test "x$zlib" = "xno"], [AC_MSG_ERROR([GNUnet requires zlib])])
AS_IF([test "x$zlib" = "xyes"],
[AC_CHECK_HEADER([zlib.h],
[AC_CHECK_LIB([z], [compress2], [zlib_ok=1], [zlib_ok=0])],
[zlib_ok=0])],
[LDFLAGS="-L$zlib/lib $LDFLAGS"
CPPFLAGS="-I$zlib/include $CPPFLAGS"
AC_CHECK_HEADER([zlib.h],
[AC_CHECK_LIB([z], [compress2], [zlib_ok=1], [zlib_ok=0])],
[zlib_ok=0])])
AS_IF([test "x$zlib_ok" = "x0"], [AC_MSG_ERROR([GNUnet requires zlib])])
AS_IF([test "x$zlib" = "xyes"],
[Z_CFLAGS=""
Z_LIBS="-lz"],
[Z_CFLAGS="-I${zlib}/include"
Z_LIBS="-L${zlib}/lib -lz"])
AC_SUBST([Z_CFLAGS])
AC_SUBST([Z_LIBS])
AM_CONDITIONAL([HAVE_ZLIB], [test "x$zlib_ok" = "x1"])
AC_DEFINE_UNQUOTED([HAVE_ZLIB], [$zlib_ok], [Define to 1 if zlib is available])
# check for iconv
AM_ICONV
# check for libunistring
CHECK_WITH_LIB([unistring], [u16_strstr], [unistr.h], [HAVE_UNISTRING])
AS_IF([test "x$unistring" = "x0"],
[AC_MSG_ERROR([GNUnet requires unistring])])
# Currently broken on Debian :-(
# AS_VERSION_COMPARE([$LIBUNISTRING_VERSION], [0.9.1.1],
# [AC_MSG_ERROR([GNUnet requires libunistring >= 0.9.1.1, found $LIBUNISTRING_VERSION])],
# [AC_MSG_ERROR([GNUnet requires libunistring >= 0.9.1.1, found $LIBUNISTRING_VERSION])])
# check for sqlite
CHECK_WITH_LIB([sqlite3], [sqlite3_open], [sqlite3.h], [HAVE_SQLITE])
# check for postgres
AX_LIB_POSTGRESQL([12.0], [postgres=1], [postgres=0])
AS_IF([test "x$postgres" = "x1"],
[SAVE_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$POSTGRES_CPPFLAGS $CPPFLAGS"
AC_CHECK_HEADERS([libpq-fe.h], [postgres=1], [postgres=0])])
AM_CONDITIONAL([HAVE_POSTGRESQL], [test "x$postgres" = "x1"])
AC_DEFINE_UNQUOTED([HAVE_POSTGRESQL], [$postgres],
[Define to 1 if Postgres is available])
CPPFLAGS="$SAVE_CPPFLAGS"
# check for libmicrohttpd
AC_ARG_WITH([microhttpd],
[AS_HELP_STRING([--with-microhttpd=PFX],
[base of libmicrohttpd installation])],
[SAVE_PKG_PATH="$PKG_CONFIG_PATH"
PKG_CONFIG_PATH="${withval}/lib/pkgconfig"
export PKG_CONFIG_PATH
PKG_CHECK_MODULES([MHD], [libmicrohttpd >= 0.9.63], [libmhd=1], [libmhd=0])
PKG_CONFIG_PATH="$SAVE_PKG_PATH"],
[PKG_CHECK_MODULES([MHD], [libmicrohttpd >= 0.9.63], [libmhd=1], [libmhd=0])])
AS_IF([test "x$libmhd" = "x0"],
[AC_MSG_ERROR([GNUnet requires libmicrohttpd >= 0.9.63])])
AM_CONDITIONAL([HAVE_MHD], [test "x$libmhd" = "x1"])
AC_DEFINE_UNQUOTED([HAVE_MHD], [$libmhd],
[Define to 1 if libmicrohttpd is available])
AM_CONDITIONAL([HAVE_REST], [true])
# check for ngtcp2
AC_ARG_WITH([ngtcp2],
[AS_HELP_STRING([--with-ngtcp2=PFX],
[base of libngtcp2 installation])],
[SAVE_PKG_PATH="$PKG_CONFIG_PATH"
PKG_CONFIG_PATH="${withval}/lib/pkgconfig"
export PKG_CONFIG_PATH
PKG_CHECK_MODULES([NGTCP], [libngtcp2 >= 1.6.0], [libngtcp2=1], [libngtcp2=0])
PKG_CHECK_MODULES([NGTCP_CRYPTO], [libngtcp2_crypto_gnutls >= 1.6.0], [libngtcp2_crypto=1], [libngtcp2_crypto=0])
PKG_CONFIG_PATH="$SAVE_PKG_PATH"],
[PKG_CHECK_MODULES([NGTCP], [libngtcp2 >= 1.6.0], [libngtcp2=1], [libngtcp2=0])
PKG_CHECK_MODULES([NGTCP_CRYPTO], [libngtcp2_crypto_gnutls >= 1.6.0], [libngtcp2_crypto=1], [libngtcp2_crypto=0])
])
AC_ARG_WITH([nghttp3],
[AS_HELP_STRING([--with-nghttp3=PFX],
[base of libnghttp3 installation])],
[SAVE_PKG_PATH="$PKG_CONFIG_PATH"
PKG_CONFIG_PATH="${withval}/lib/pkgconfig"
export PKG_CONFIG_PATH
PKG_CHECK_MODULES([NGHTTP], [libnghttp3 >= 1.4.0], [libnghttp3=1], [libnghttp3=0])
PKG_CONFIG_PATH="$SAVE_PKG_PATH"],
[PKG_CHECK_MODULES([NGHTTP], [libnghttp3 >= 1.4.0], [libnghttp3=1], [libnghttp3=0])])
AM_CONDITIONAL([HAVE_NGHTTP], [test "x$libnghttp3" = "x1" && test "x$libngtcp2" = "x1" && test "x$libngtcp2_crypto" = "x1"])
AC_DEFINE_UNQUOTED([HAVE_NGHTTP], [$libnghttp3],
[Define to 1 if libnghttp3 is available])
# check for gnutls
AC_ARG_WITH([gnutls],
[AS_HELP_STRING([--with-gnutls=PFX], [base of gnutls installation])],
[AS_CASE([$with_gnutls],
[no],
[gnutls=0],
[yes],
[AC_CHECK_HEADERS([gnutls/abstract.h],
[AC_CHECK_LIB([gnutls], [gnutls_priority_set],
[gnutls=1], [gnutls=0])],
[gnutls=0])
AC_CHECK_HEADERS([gnutls/dane.h],
[AC_CHECK_LIB([gnutls-dane], [dane_verify_crt_raw],
[gnutls_dane=1], [gnutls_dane=0])],
[gnutls_dane=0])],
[LDFLAGS="-L$with_gnutls/lib $LDFLAGS"
CPPFLAGS="-I$with_gnutls/include $CPPFLAGS"
AC_CHECK_HEADERS([gnutls/abstract.h],
[AC_CHECK_LIB([gnutls], [gnutls_priority_set],
[gnutls=1], [gnutls=0])],
[gnutls=0])
AC_CHECK_HEADERS([gnutls/dane.h],
[AC_CHECK_LIB([gnutls-dane], [dane_verify_crt_raw],
[gnutls_dane=1], [gnutls_dane=0])],
[gnutls_dane=0])])],
[AC_CHECK_HEADERS([gnutls/abstract.h],
[AC_CHECK_LIB([gnutls], [gnutls_priority_set],
[gnutls=1], [gnutls=0])],
[gnutls=0])
AC_CHECK_HEADERS([gnutls/dane.h],
[AC_CHECK_LIB([gnutls-dane], [dane_verify_crt_raw],
[gnutls_dane=1], [gnutls_dane=0])],
[gnutls_dane=0])])
AM_CONDITIONAL([HAVE_GNUTLS], [test "x$gnutls" = "x1"])
AM_CONDITIONAL([HAVE_GNUTLS_DANE], [test "x$gnutls_dane" = "x1"])
AC_DEFINE_UNQUOTED([HAVE_GNUTLS], [$gnutls], [Define to 1 if GnuTLS is available])
AC_DEFINE_UNQUOTED([HAVE_GNUTLS_DANE], [$gnutls_dane],
[Define to 1 if GnuTLS has DANE support])
# restore LIBS
LIBS=$SAVE_LIBS
# Check for standard header files.
AC_HEADER_DIRENT
# Check for headers that are ALWAYS required
# It's assumed that AC_INCLUDES_DEFAULT has been executed already, as that
# makes sure the most common headers (e.g. stdlib.h) are available