netdata/configure.ac

#
# Copyright (C) 2015 Alon Bar-Lev <alon.barlev@gmail.com>
# SPDX-License-Identifier: GPL-3.0-or-later
#
AC_PREREQ(2.60)

# We do not use m4_esyscmd_s to support older autoconf.
define([VERSION_STRING], m4_esyscmd([git describe 2>/dev/null | tr -d '\n']))
define([VERSION_FROM_FILE], m4_esyscmd([cat packaging/version | tr -d '\n']))
m4_ifval(VERSION_STRING, [], [define([VERSION_STRING], VERSION_FROM_FILE)])

AC_INIT([netdata], VERSION_STRING[])

AM_MAINTAINER_MODE([disable])
if test x"$USE_MAINTAINER_MODE" = xyes; then
AC_MSG_NOTICE(***************** MAINTAINER MODE *****************)
fi

PACKAGE_RPM_VERSION="VERSION_STRING"
AC_SUBST([PACKAGE_RPM_VERSION])

# -----------------------------------------------------------------------------
# autoconf initialization

AC_CONFIG_AUX_DIR([.])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([build/m4])
AC_CONFIG_SRCDIR([daemon/main.c])
define([AUTOMATE_INIT_OPTIONS], [tar-pax subdir-objects])
m4_ifdef([AM_SILENT_RULES], [
    define([AUTOMATE_INIT_OPTIONS], [tar-pax silent-rules subdir-objects])
    ])
AM_INIT_AUTOMAKE(AUTOMATE_INIT_OPTIONS)
m4_ifdef([AM_SILENT_RULES], [
    AM_SILENT_RULES([yes])
    ])
AC_CANONICAL_HOST
AC_PROG_CC
AC_PROG_CC_C99
AM_PROG_CC_C_O
AC_PROG_CXX
AC_PROG_INSTALL
PKG_PROG_PKG_CONFIG
AC_USE_SYSTEM_EXTENSIONS

# -----------------------------------------------------------------------------
# configurable options

AC_ARG_ENABLE(
    [plugin-nfacct],
    [AS_HELP_STRING([--enable-plugin-nfacct], [enable nfacct plugin @<:@default autodetect@:>@])],
    ,
    [enable_plugin_nfacct="detect"]
)
AC_ARG_ENABLE(
    [plugin-freeipmi],
    [AS_HELP_STRING([--enable-plugin-freeipmi], [enable freeipmi plugin @<:@default autodetect@:>@])],
    ,
    [enable_plugin_freeipmi="detect"]
)
AC_ARG_ENABLE(
    [plugin-cups],
    [AS_HELP_STRING([--enable-plugin-cups], [enable cups plugin @<:@default autodetect@:>@])],
    ,
    [enable_plugin_cups="detect"]
)
AC_ARG_ENABLE(
    [plugin-xenstat],
    [AS_HELP_STRING([--enable-plugin-xenstat], [enable xenstat plugin @<:@default autodetect@:>@])],
    ,
    [enable_plugin_xenstat="detect"]
)
AC_ARG_ENABLE(
    [backend-kinesis],
    [AS_HELP_STRING([--enable-backend-kinesis], [enable kinesis backend @<:@default autodetect@:>@])],
    ,
    [enable_backend_kinesis="detect"]
)
AC_ARG_ENABLE(
    [exporting-pubsub],
    [AS_HELP_STRING([--enable-exporting-pubsub], [enable pubsub exporting connector @<:@default autodetect@:>@])],
    ,
    [enable_exporting_pubsub="detect"]
)
AC_ARG_ENABLE(
    [backend-prometheus-remote-write],
    [AS_HELP_STRING([--enable-backend-prometheus-remote-write], [enable prometheus remote write backend @<:@default autodetect@:>@])],
    ,
    [enable_backend_prometheus_remote_write="detect"]
)
AC_ARG_ENABLE(
    [backend-mongodb],
    [AS_HELP_STRING([--enable-backend-mongodb], [enable mongodb backend @<:@default autodetect@:>@])],
    ,
    [enable_backend_mongodb="detect"]
)
AC_ARG_ENABLE(
    [pedantic],
    [AS_HELP_STRING([--enable-pedantic], [enable pedantic compiler warnings @<:@default disabled@:>@])],
    ,
    [enable_pedantic="no"]
)
AC_ARG_ENABLE(
    [accept4],
    [AS_HELP_STRING([--disable-accept4], [System does not have accept4 @<:@default autodetect@:>@])],
    ,
    [enable_accept4="detect"]
)
AC_ARG_WITH(
    [webdir],
    [AS_HELP_STRING([--with-webdir], [location of webdir @<:@PKGDATADIR/web@:>@])],
    [webdir="${withval}"],
    [webdir="\$(pkgdatadir)/web"]
)
AC_ARG_WITH(
    [libcap],
    [AS_HELP_STRING([--with-libcap], [build with libcap @<:@default autodetect@:>@])],
    ,
    [with_libcap="detect"]
)
AC_ARG_WITH(
    [zlib],
    [AS_HELP_STRING([--without-zlib], [build without zlib @<:@default enabled@:>@])],
    ,
    [with_zlib="yes"]
)
AC_ARG_WITH(
    [math],
    [AS_HELP_STRING([--without-math], [build without math @<:@default enabled@:>@])],
    ,
    [with_math="yes"]
)
AC_ARG_WITH(
    [user],
    [AS_HELP_STRING([--with-user], [use this user to drop privilege @<:@default nobody@:>@])],
    ,
    [with_user="nobody"]
)
AC_ARG_ENABLE(
    [x86-sse],
    [AS_HELP_STRING([--disable-x86-sse], [SSE/SS2 optimizations on x86 @<:@default enabled@:>@])],
    ,
    [enable_x86_sse="yes"]
)
AC_ARG_ENABLE(
    [lto],
    [AS_HELP_STRING([--disable-lto], [Link Time Optimizations @<:@default autodetect@:>@])],
    ,
    [enable_lto="detect"]
)
AC_ARG_ENABLE(
    [https],
    [AS_HELP_STRING([--enable-https], [Enable SSL support @<:@default autodetect@:>@])],
    ,
    [enable_https="detect"]
)
AC_ARG_ENABLE(
    [dbengine],
    [AS_HELP_STRING([--disable-dbengine], [disable netdata dbengine @<:@default autodetect@:>@])],
    ,
    [enable_dbengine="detect"]
)
AC_ARG_ENABLE(
    [jsonc],
    [AS_HELP_STRING([--enable-jsonc], [Enable JSON-C support @<:@default autodetect@:>@])],
    ,
    [enable_jsonc="detect"]
)
AC_ARG_ENABLE(
    [ebpf],
    [AS_HELP_STRING([--disable-ebpf], [Disable eBPF support @<:@default autodetect@:>@])],
    ,
    [enable_ebpf="detect"]
)

# -----------------------------------------------------------------------------
# Enforce building with C99, bail early if we can't.
test "${ac_cv_prog_cc_c99}" = "no" && AC_MSG_ERROR([Netdata rquires a compiler that supports C99 to build])

# -----------------------------------------------------------------------------
# Check if cloud is enabled and if the functionality is available

AC_ARG_ENABLE(
    [cloud],
    [AS_HELP_STRING([--disable-cloud],
                    [Disables all cloud functionality])],
    [ enable_cloud="$enableval" ],
    [ enable_cloud="detect" ]
)

if test "${enable_cloud}" = "no"; then
    AC_DEFINE([DISABLE_CLOUD], [1], [disable netdata cloud functionality])
fi

# -----------------------------------------------------------------------------
# netdata required checks

# fails on centos6
#AX_CHECK_ENABLE_DEBUG()

AX_GCC_FUNC_ATTRIBUTE([returns_nonnull])
AX_GCC_FUNC_ATTRIBUTE([malloc])
AX_GCC_FUNC_ATTRIBUTE([noreturn])
AX_GCC_FUNC_ATTRIBUTE([noinline])
AX_GCC_FUNC_ATTRIBUTE([format])
AX_GCC_FUNC_ATTRIBUTE([warn_unused_result])

AC_CHECK_TYPES([struct timespec, clockid_t], [], [], [[#include <time.h>]])
AC_SEARCH_LIBS([clock_gettime], [rt posix4])
AC_CHECK_FUNCS([clock_gettime])
AC_CHECK_FUNCS([sched_setscheduler sched_getscheduler sched_getparam sched_get_priority_min sched_get_priority_max getpriority setpriority nice])
AC_CHECK_FUNCS([recvmmsg])

AC_TYPE_INT8_T
AC_TYPE_INT16_T
AC_TYPE_INT32_T
AC_TYPE_INT64_T
AC_TYPE_UINT8_T
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T
AC_C_INLINE
AC_FUNC_STRERROR_R
AC_C__GENERIC
AC_C___ATOMIC
# AC_C_STMT_EXPR
AC_CHECK_SIZEOF([void *])
AC_CANONICAL_HOST
AC_HEADER_MAJOR
AC_HEADER_RESOLV

AC_CHECK_HEADERS_ONCE([sys/prctl.h])
AC_CHECK_HEADERS_ONCE([sys/vfs.h])
AC_CHECK_HEADERS_ONCE([sys/statfs.h])
AC_CHECK_HEADERS_ONCE([sys/statvfs.h])
AC_CHECK_HEADERS_ONCE([sys/mount.h])

if test "${enable_accept4}" != "no"; then
    AC_CHECK_FUNCS_ONCE(accept4)
fi

# -----------------------------------------------------------------------------
# operating system detection

AC_MSG_CHECKING([operating system])
case "$host_os" in
freebsd*)
    build_target=freebsd
    build_target_id=2
    CFLAGS="${CFLAGS} -I/usr/local/include -L/usr/local/lib"
    ;;
darwin*)
    build_target=macos
    build_target_id=3
    LDFLAGS="${LDFLAGS} -framework CoreFoundation -framework IOKit"
    ;;
*)
    build_target=linux
    build_target_id=1
    ;;
esac

AM_CONDITIONAL([FREEBSD], [test "${build_target}" = "freebsd"])
AM_CONDITIONAL([MACOS], [test "${build_target}" = "macos"])
AM_CONDITIONAL([LINUX], [test "${build_target}" = "linux"])
AC_MSG_RESULT([${build_target} with id ${build_target_id}])


# -----------------------------------------------------------------------------
# pthreads

ACX_PTHREAD(, [AC_MSG_ERROR([Cannot initialize pthread environment])])
LIBS="${PTHREAD_LIBS} ${LIBS}"
CFLAGS="${CFLAGS} ${PTHREAD_CFLAGS}"
CC="${PTHREAD_CC}"

AC_CHECK_LIB(
[pthread],
[pthread_getname_np],
[AC_DEFINE([HAVE_PTHREAD_GETNAME_NP], [1], [Is set if pthread_getname_np is available])]
)


# -----------------------------------------------------------------------------
# libm

AC_ARG_VAR([MATH_CFLAGS], [C compiler flags for math])
AC_ARG_VAR([MATH_LIBS], [linker flags for math])
if test -z "${MATH_LIBS}"; then
    AC_CHECK_LIB(
        [m],
        [sin],
        [MATH_LIBS="-lm"]
    )
fi
test "${with_math}" = "yes" -a -z "${MATH_LIBS}" && AC_MSG_ERROR([math required but not found])

AC_MSG_CHECKING([if libm should be used])
if test "${with_math}" != "no" -a ! -z "${MATH_LIBS}"; then
    with_math="yes"
    AC_DEFINE([STORAGE_WITH_MATH], [1], [math usability])
    OPTIONAL_MATH_CFLAGS="${MATH_CFLAGS}"
    OPTIONAL_MATH_LIBS="${MATH_LIBS}"
else
    with_math="no"
fi
AC_MSG_RESULT([${with_math}])


# -----------------------------------------------------------------------------
# libuv multi-platform support library with a focus on asynchronous I/O
# TODO: check version, uv_fs_scandir_next only available in version >= 1.0

AC_CHECK_LIB(
    [uv],
    [uv_fs_scandir_next],
    [UV_LIBS="-luv"]
)
test -z "${UV_LIBS}" && \
    AC_MSG_ERROR([libuv required but not found. Try installing 'libuv1-dev' or 'libuv-devel'.])
OPTIONAL_UV_CFLAGS="${UV_CFLAGS}"
OPTIONAL_UV_LIBS="${UV_LIBS}"


# -----------------------------------------------------------------------------
# lz4 Extremely Fast Compression algorithm

AC_CHECK_LIB(
    [lz4],
    [LZ4_compress_default],
    [LZ4_LIBS="-llz4"]
)


# -----------------------------------------------------------------------------
# zlib

PKG_CHECK_MODULES(
    [ZLIB],
    [zlib],
    [have_zlib=yes],
    [have_zlib=no]
)
test "${with_zlib}" = "yes" -a "${have_zlib}" != "yes" && AC_MSG_ERROR([zlib required but not found. Try installing 'zlib1g-dev' or 'zlib-devel'.])

AC_MSG_CHECKING([if zlib should be used])
if test "${with_zlib}" != "no" -a "${have_zlib}" = "yes"; then
    with_zlib="yes"
    AC_DEFINE([NETDATA_WITH_ZLIB], [1], [zlib usability])
    OPTIONAL_ZLIB_CFLAGS="${ZLIB_CFLAGS}"
    OPTIONAL_ZLIB_LIBS="${ZLIB_LIBS}"
else
    with_zlib="no"
fi
AC_MSG_RESULT([${with_zlib}])


# -----------------------------------------------------------------------------
# libuuid

PKG_CHECK_MODULES(
    [UUID],
    [uuid],
    [have_uuid=yes],
    [AC_MSG_ERROR([libuuid required but not found. Try installing 'uuid-dev' or 'libuuid-devel'.])]
)
AC_DEFINE([NETDATA_WITH_UUID], [1], [uuid usability])
OPTIONAL_UUID_CFLAGS="${UUID_CFLAGS}"
OPTIONAL_UUID_LIBS="${UUID_LIBS}"

# -----------------------------------------------------------------------------
# OpenSSL Cryptography and SSL/TLS Toolkit

AC_CHECK_LIB(
    [crypto],
    [SHA256_Init],
    [SSL_LIBS="-lcrypto -lssl"]
)

AC_CHECK_LIB(
    [crypto],
    [X509_VERIFY_PARAM_set1_host],
    [ssl_host_validation="yes"],
    [ssl_host_validation="no"]
)

test -z "${SSL_LIBS}" || \
    AC_DEFINE([HAVE_CRYPTO], [1], [libcrypto availability])

if test "${ssl_host_validation}" = "no"; then
    AC_DEFINE([HAVE_X509_VERIFY_PARAM_set1_host], [0], [ssl host validation])
    AC_MSG_WARN([DISABLING SSL HOSTNAME VALIDATION BECAUSE IT IS NOT AVAILABLE ON THIS SYSTEM.])
else
    AC_DEFINE([HAVE_X509_VERIFY_PARAM_set1_host], [1], [ssl host validation])
fi

# -----------------------------------------------------------------------------
# JSON-C library

PKG_CHECK_MODULES([JSON],[json-c],AC_CHECK_LIB(
    [json-c],
    [json_object_get_type],
    [JSONC_LIBS="-ljson-c"]),AC_CHECK_LIB(
        [json],
        [json_object_get_type],
        [JSONC_LIBS="-ljson"])
    )

OPTIONAL_JSONC_LIBS="${JSONC_LIBS}"

# -----------------------------------------------------------------------------
# DB engine and HTTPS
test "${enable_dbengine}" = "yes" -a -z "${LZ4_LIBS}" && \
    AC_MSG_ERROR([liblz4 required but not found. Try installing 'liblz4-dev' or 'lz4-devel'.])


AC_ARG_WITH([libJudy],
            [AS_HELP_STRING([--with-libJudy=PREFIX],[Use a specific Judy library (default is system-library)])],
            [
                libJudy_dir="$withval"
                AC_MSG_CHECKING(for libJudy in $withval)
                if test -f "${libJudy_dir}/libJudy.a" -a -f "${libJudy_dir}/Judy.h"; then
                    LIBS_BACKUP="${LIBS}"
                    LIBS="${libJudy_dir}/libJudy.a"
                    AC_LINK_IFELSE([AC_LANG_SOURCE([[#include "${libJudy_dir}/Judy.h"
                                                     int main (int argc, char **argv) {
                                                        Pvoid_t PJLArray = (Pvoid_t) NULL;
                                                        Word_t * PValue;
                                                        Word_t Index;
                                                        JLI(PValue, PJLArray, Index);
                                                     }]])],
                                                     [HAVE_libJudy_a="yes"],
                                                     [HAVE_libJudy_a="no"])
                    LIBS="${LIBS_BACKUP}"
                    JUDY_LIBS="${libJudy_dir}/libJudy.a"
                    JUDY_CFLAGS="-I${libJudy_dir}"
                    AC_MSG_RESULT([$HAVE_libJudy_a])
                else
                    libjudy_dir=""
                    HAVE_libJudy_a="no"
                    AC_MSG_RESULT([$HAVE_libJudy_a])
                fi
            ],
            [HAVE_libJudy_a="no"])

if test "${HAVE_libJudy_a}" = "no"; then
    AC_CHECK_LIB(
                    [Judy],
                    [JudyLIns],
                    [JUDY_LIBS="-lJudy"]
                )
fi

test "${enable_dbengine}" = "yes" -a -z "${JUDY_LIBS}" && \
    AC_MSG_ERROR([libJudy required but not found. Try installing 'libjudy-dev' or 'Judy-devel'.])

test "${enable_https}" = "yes" -a -z "${SSL_LIBS}" && \
    AC_MSG_ERROR([OpenSSL required for HTTPS but not found. Try installing 'libssl-dev' or 'openssl-devel'.])

test "${enable_dbengine}" = "yes" -a -z "${SSL_LIBS}" && \
    AC_MSG_ERROR([OpenSSL required for DBENGINE but not found. Try installing 'libssl-dev' or 'openssl-devel'.])

AC_MSG_CHECKING([if netdata dbengine should be used])
if test "${enable_dbengine}" != "no" -a "${UV_LIBS}" -a "${LZ4_LIBS}" -a "${JUDY_LIBS}" -a "${SSL_LIBS}"; then
    enable_dbengine="yes"
    AC_DEFINE([ENABLE_DBENGINE], [1], [netdata dbengine usability])
    OPTIONAL_LZ4_CFLAGS="${LZ4_CFLAGS}"
    OPTIONAL_LZ4_LIBS="${LZ4_LIBS}"
    OPTIONAL_JUDY_CFLAGS="${JUDY_CFLAGS}"
    OPTIONAL_JUDY_LIBS="${JUDY_LIBS}"
    OPTIONAL_SSL_CFLAGS="${SSL_CFLAGS}"
    OPTIONAL_SSL_LIBS="${SSL_LIBS}"
else
    enable_dbengine="no"
fi
AC_MSG_RESULT([${enable_dbengine}])
AM_CONDITIONAL([ENABLE_DBENGINE], [test "${enable_dbengine}" = "yes"])

AC_MSG_CHECKING([if netdata https should be used])
if test "${enable_https}" != "no" -a "${SSL_LIBS}"; then
    enable_https="yes"
    AC_DEFINE([ENABLE_HTTPS], [1], [netdata HTTPS usability])
    OPTIONAL_SSL_CFLAGS="${SSL_CFLAGS}"
    OPTIONAL_SSL_LIBS="${SSL_LIBS}"
else
    enable_https="no"
fi
AC_MSG_RESULT([${enable_https}])
AM_CONDITIONAL([ENABLE_HTTPS], [test "${enable_https}" = "yes"])

# -----------------------------------------------------------------------------
# JSON-C

if test "${enable_jsonc}" != "no" -a -z "${JSONC_LIBS}"; then
    # Try and detect manual static build presence (from netdata-installer.sh)
    AC_MSG_CHECKING([if statically built json-c is present])
    HAVE_libjson_c_a="no"
    if test -f "externaldeps/jsonc/libjson-c.a"; then
        LIBS_BKP="${LIBS}"
        LIBS="externaldeps/jsonc/libjson-c.a"
        AC_LINK_IFELSE([AC_LANG_SOURCE([[#include "externaldeps/jsonc/json-c/json.h"
                                         int main (int argc, char **argv) {
                                             struct json_object *jobj;
                                             char *str = "{ \"msg-type\": \"random\" }";
                                             jobj = json_tokener_parse(str);
                                             json_object_get_type(jobj);
                                         }]])],
                                        [HAVE_libjson_c_a="yes"],
                                        [HAVE_libjson_c_a="no"])
        LIBS="${LIBS_BKP}"
    fi

	if test "${HAVE_libjson_c_a}" = "yes"; then
		AC_DEFINE([LINK_STATIC_JSONC], [1], [static json-c should be used])
		JSONC_LIBS="static"
		OPTIONAL_JSONC_STATIC_CFLAGS="-I externaldeps/jsonc"
	fi
	AC_MSG_RESULT([${HAVE_libjson_c_a}])
fi
AM_CONDITIONAL([LINK_STATIC_JSONC], [test "${JSONC_LIBS}" = "static"])

test "${enable_jsonc}" = "yes" -a -z "${JSONC_LIBS}" && \
    AC_MSG_ERROR([JSON-C required but not found. Try installing 'libjson-c-dev' or 'json-c'.])

AC_MSG_CHECKING([if json-c should be used])
if test "${enable_jsonc}" != "no" -a "${JSONC_LIBS}"; then
	enable_jsonc="yes"
	AC_DEFINE([ENABLE_JSONC], [1], [netdata json-c usability])
else
	enable_jsonc="no"
fi
AC_MSG_RESULT([${enable_jsonc}])
AM_CONDITIONAL([ENABLE_JSONC], [test "${enable_jsonc}" = "yes"])

# -----------------------------------------------------------------------------
# compiler options

AC_ARG_VAR([SSE_CANDIDATE], [C compiler flags for SSE])
AS_CASE([$host_cpu],
    [i?86], [SSE_CANDIDATE="yes"]
)
AC_SUBST([SSE_CANDIDATE])
if test "${SSE_CANDIDATE}" = "yes" -a "${enable_x86_sse}" = "yes"; then
    opt="-msse2 -mfpmath=sse"
    AX_CHECK_COMPILE_FLAG(${opt}, [CFLAGS="${CFLAGS} ${opt}"], [])
fi

if test "${GCC}" = "yes"; then
    AC_DEFINE_UNQUOTED([likely(x)], [__builtin_expect(!!(x), 1)], [gcc branch optimization])
    AC_DEFINE_UNQUOTED([unlikely(x)], [__builtin_expect(!!(x), 0)], [gcc branch optimization])
else
    AC_DEFINE_UNQUOTED([likely(x)], [(x)], [gcc branch optimization])
    AC_DEFINE_UNQUOTED([unlikely(x)], [(x)], [gcc branch optimization])
fi

if test "${GCC}" = "yes"; then
    AC_DEFINE([__always_unused], [__attribute__((unused))], [gcc unused attribute])
    AC_DEFINE([__maybe_unused], [__attribute__((unused))], [gcc unused attribute])
else
    AC_DEFINE([__always_unused], [], [dummy unused attribute])
    AC_DEFINE([__maybe_unused], [], [dummy unused attribute])
fi

if test "${enable_pedantic}" = "yes"; then
    enable_strict="yes"
    CFLAGS="${CFLAGS} -pedantic -Wall -Wextra -Wno-long-long"
fi


# -----------------------------------------------------------------------------
# memory allocation library

AC_MSG_CHECKING([for memory allocator])
TS_CHECK_JEMALLOC
if test "$has_jemalloc" = "1"; then
    AC_DEFINE([ENABLE_JEMALLOC], [1], [compile and link with jemalloc])
    AC_MSG_RESULT([jemalloc])
else
    TS_CHECK_TCMALLOC
    if test "$has_tcmalloc" = "1"; then
        AC_DEFINE([ENABLE_TCMALLOC], [1], [compile and link with tcmalloc])
        AC_MSG_RESULT([tcmalloc])
    else
        AC_MSG_RESULT([system])
        AC_C_MALLOPT
        AC_C_MALLINFO
    fi
fi


# -----------------------------------------------------------------------------
# libcap

PKG_CHECK_MODULES(
    [LIBCAP],
    [libcap],
    [AC_CHECK_LIB([cap], [cap_get_proc, cap_set_proc],
        [AC_CHECK_HEADER(
            [sys/capability.h],
            [have_libcap=yes],
            [have_libcap=no]
        )],
        [have_libcap=no]
    )],
    [have_libcap=no]
)
test "${with_libcap}" = "yes" -a "${have_libcap}" != "yes" && AC_MSG_ERROR([libcap required but not found.])

AC_MSG_CHECKING([if libcap should be used])
if test "${with_libcap}" != "no" -a "${have_libcap}" = "yes"; then
    with_libcap="yes"
    AC_DEFINE([HAVE_CAPABILITY], [1], [libcap usability])
    OPTIONAL_LIBCAP_CFLAGS="${LIBCAP_CFLAGS}"
    OPTIONAL_LIBCAP_LIBS="${LIBCAP_LIBS}"
else
    with_libcap="no"
fi
AC_MSG_RESULT([${with_libcap}])
AM_CONDITIONAL([ENABLE_CAPABILITY], [test "${with_libcap}" = "yes"])

# -----------------------------------------------------------------------------
# ACLK

AC_MSG_CHECKING([if cloud functionality should be enabled])
AC_MSG_RESULT([${enable_cloud}])
if test "$enable_cloud" != "no"; then
    # just to have all messages that can fail ACLK build in one place
    # so it is easier to see why it can't be built
    if test -n "${SSL_LIBS}"; then
        OPTIONAL_SSL_CFLAGS="${SSL_CFLAGS}"
        OPTIONAL_SSL_LIBS="${SSL_LIBS}"
    else
        AC_MSG_WARN([OpenSSL required for agent-cloud-link but not found. Try installing 'libssl-dev' or 'openssl-devel'.])
    fi

    AC_MSG_CHECKING([if libmosquitto static lib is present (and builds)])
    if test -f "externaldeps/mosquitto/libmosquitto.a"; then
        LIBS_BKP="${LIBS}"
        LIBS="externaldeps/mosquitto/libmosquitto.a ${OPTIONAL_SSL_LIBS} ${LIBS_BKP}"
        AC_LINK_IFELSE([AC_LANG_SOURCE([[#include "externaldeps/mosquitto/mosquitto.h"
                                         int main (int argc, char **argv) {
                                             int m,mm,r;
                                             mosquitto_lib_version(&m, &mm, &r);
                                         }]])],
                                        [HAVE_libmosquitto_a="yes"],
                                        [HAVE_libmosquitto_a="no"])
        LIBS="${LIBS_BKP}"
    else
        HAVE_libmosquitto_a="no"
        AC_DEFINE([ACLK_NO_LIBMOSQ], [1], [Libmosquitto.a was not found during build.])
    fi
    AC_MSG_RESULT([${HAVE_libmosquitto_a}])

    AC_MSG_CHECKING([if libwebsockets static lib is present])
    if test -f "externaldeps/libwebsockets/libwebsockets.a"; then
        LWS_CFLAGS="-I externaldeps/libwebsockets/include"
        HAVE_libwebsockets_a="yes"
    else
        HAVE_libwebsockets_a="no"
        AC_DEFINE([ACLK_NO_LWS], [1], [libwebsockets.a was not found during build.])
    fi
    AC_MSG_RESULT([${HAVE_libwebsockets_a}])

    if test "${build_target}" = "linux" -a "${enable_cloud}" != "no"; then
        if test "${have_libcap}" = "yes" -a "${with_libcap}" = "no"; then
            AC_MSG_ERROR([agent-cloud-link can't be built without libcap. Disable it by --disable-cloud or enable libcap])
        fi
        if test "${with_libcap}" = "yes"; then
            LWS_CFLAGS+=" ${LIBCAP_CFLAGS}"
        fi
    fi

    # next 2 lines are just to have info for ACLK dependencies in common place
    AC_MSG_CHECKING([if json-c available for ACLK])
    AC_MSG_RESULT([${enable_jsonc}])

    test "${enable_cloud}" = "yes" -a "${enable_jsonc}" = "no" && \
        AC_MSG_ERROR([You have asked for ACLK to be built but no json-c available. ACLK requires json-c])

    AC_MSG_CHECKING([if netdata agent-cloud-link can be enabled])
    if test "${HAVE_libmosquitto_a}" = "yes" -a "${HAVE_libwebsockets_a}" = "yes" -a -n "${SSL_LIBS}" -a "${enable_jsonc}" = "yes"; then
        can_enable_aclk="yes"
    else
        can_enable_aclk="no"
    fi
    AC_MSG_RESULT([${can_enable_aclk}])

    test "${enable_cloud}" = "yes" -a "${can_enable_aclk}" = "no" && \
        AC_MSG_ERROR([User required agent-cloud-link but it can't be built!])

    AC_MSG_CHECKING([if netdata agent-cloud-link should/will be enabled])
    if test "${enable_cloud}" = "detect"; then
        enable_aclk=$can_enable_aclk
    else
        enable_aclk=$enable_cloud
    fi
    AC_SUBST([can_enable_aclk])

    if test "${enable_aclk}" = "yes"; then
        AC_DEFINE([ENABLE_ACLK], [1], [netdata ACLK])
    fi

    AC_MSG_RESULT([${enable_aclk}])
fi
AC_SUBST([enable_cloud])
AM_CONDITIONAL([ENABLE_ACLK], [test "${enable_aclk}" = "yes"])

# -----------------------------------------------------------------------------
# apps.plugin

AC_MSG_CHECKING([if apps.plugin should be enabled])
if test "${build_target}" != "macos"; then
    AC_DEFINE([ENABLE_APPS_PLUGIN], [1], [apps.plugin])
    enable_plugin_apps="yes"
else
    enable_plugin_apps="no"
fi
AC_MSG_RESULT([${enable_plugin_apps}])
AM_CONDITIONAL([ENABLE_PLUGIN_APPS], [test "${enable_plugin_apps}" = "yes"])


# -----------------------------------------------------------------------------
# freeipmi.plugin - libipmimonitoring

PKG_CHECK_MODULES(
    [IPMIMONITORING],
    [libipmimonitoring],
    [AC_CHECK_LIB([ipmimonitoring], [
        ipmi_monitoring_sensor_readings_by_record_id,
        ipmi_monitoring_sensor_readings_by_sensor_type,
        ipmi_monitoring_sensor_read_sensor_number,
        ipmi_monitoring_sensor_read_sensor_name,
        ipmi_monitoring_sensor_read_sensor_state,
        ipmi_monitoring_sensor_read_sensor_units,
        ipmi_monitoring_sensor_iterator_next,
        ipmi_monitoring_ctx_sensor_config_file,
        ipmi_monitoring_ctx_sdr_cache_directory,
        ipmi_monitoring_ctx_errormsg,
        ipmi_monitoring_ctx_create
    ],
        [AC_CHECK_HEADER(
            [ipmi_monitoring.h],
            [AC_CHECK_HEADER(
                [ipmi_monitoring_bitmasks.h],
                [have_ipmimonitoring=yes],
                [have_ipmimonitoring=no]
            )],
            [have_ipmimonitoring=no]
        )],
        [have_ipmimonitoring=no]
    )],
    [have_ipmimonitoring=no]
)
test "${enable_plugin_freeipmi}" = "yes" -a "${have_ipmimonitoring}" != "yes" && \
    AC_MSG_ERROR([ipmimonitoring required but not found. Try installing 'libipmimonitoring-dev' or 'libipmimonitoring-devel'])

AC_MSG_CHECKING([if freeipmi.plugin should be enabled])
if test "${enable_plugin_freeipmi}" != "no" -a "${have_ipmimonitoring}" = "yes"; then
    enable_plugin_freeipmi="yes"
    AC_DEFINE([HAVE_FREEIPMI], [1], [ipmimonitoring usability])
    OPTIONAL_IPMIMONITORING_CFLAGS="${IPMIMONITORING_CFLAGS}"
    OPTIONAL_IPMIMONITORING_LIBS="${IPMIMONITORING_LIBS}"
else
    enable_plugin_freeipmi="no"
fi
AC_MSG_RESULT([${enable_plugin_freeipmi}])
AM_CONDITIONAL([ENABLE_PLUGIN_FREEIPMI], [test "${enable_plugin_freeipmi}" = "yes"])


# -----------------------------------------------------------------------------
# cups.plugin - libcups

# Only check most recently added method of cups
AC_CHECK_LIB([cups], [httpConnect2],
    [AC_CHECK_HEADER(
        [cups/cups.h],
        [have_cups=yes],
        [have_cups=no]
    )],
    [have_cups=no]
)

test "${enable_plugin_cups}" = "yes" -a "${have_cups}" != "yes" && \
    AC_MSG_ERROR([cups required but not found. Try installing 'cups'])

AC_ARG_WITH([cups-config],
    [AS_HELP_STRING([--with-cups-config=path], [Specify path to cups-config executable.])],
    [with_cups_config="$withval"],
    [with_cups_config=system]
    )

AS_IF([test "x$with_cups_config" != "xsystem"], [
	CUPSCONFIG=$with_cups_config
], [
	AC_PATH_TOOL(CUPSCONFIG, [cups-config])
	AS_IF([test -z "$CUPSCONFIG"], [
		have_cups=no
	])
])

AC_MSG_CHECKING([if cups.plugin should be enabled])
if test "${enable_plugin_cups}" != "no" -a "${have_cups}" = "yes"; then
    enable_plugin_cups="yes"
    AC_DEFINE([HAVE_CUPS], [1], [cups usability])

    CUPS_CFLAGS="${CUPS_CFLAGS} `$CUPSCONFIG --cflags`"
    CUPS_LIBS="${CUPS_LIBS} `$CUPSCONFIG --libs`"

    OPTIONAL_CUPS_CFLAGS="${CUPS_CFLAGS}"
    OPTIONAL_CUPS_LIBS="${CUPS_LIBS}"
else
    enable_plugin_cups="no"
fi
AC_MSG_RESULT([${enable_plugin_cups}])
AM_CONDITIONAL([ENABLE_PLUGIN_CUPS], [test "${enable_plugin_cups}" = "yes"])


# -----------------------------------------------------------------------------
# nfacct.plugin - libmnl, libnetfilter_acct

AC_CHECK_HEADER(
    [linux/netfilter/nfnetlink_conntrack.h],
    [AC_CHECK_DECL(
        [CTA_STATS_MAX],
        [have_nfnetlink_conntrack=yes],
        [have_nfnetlink_conntrack=no],
        [#include <linux/netfilter/nfnetlink_conntrack.h>]
    )],
    [have_nfnetlink_conntrack=no]
)

PKG_CHECK_MODULES(
    [NFACCT],
    [libnetfilter_acct],
    [AC_CHECK_LIB(
        [netfilter_acct],
        [nfacct_alloc],
        [have_libnetfilter_acct=yes],
        [have_libnetfilter_acct=no]
    )],
    [have_libnetfilter_acct=no]
)

PKG_CHECK_MODULES(
    [LIBMNL],
    [libmnl],
    [AC_CHECK_LIB(
        [mnl],
        [mnl_socket_open],
        [have_libmnl=yes],
        [have_libmnl=no]
    )],
    [have_libmnl=no]
)

test "${enable_plugin_nfacct}" = "yes" -a "${have_nfnetlink_conntrack}" != "yes" && \
    AC_MSG_ERROR([nfnetlink_conntrack.h required but not found or too old])

test "${enable_plugin_nfacct}" = "yes" -a "${have_libnetfilter_acct}" != "yes" && \
    AC_MSG_ERROR([netfilter_acct required but not found])

test "${enable_plugin_nfacct}" = "yes" -a "${have_libmnl}" != "yes" && \
    AC_MSG_ERROR([libmnl required but not found. Try installing 'libmnl-dev' or 'libmnl-devel'])

AC_MSG_CHECKING([if nfacct.plugin should be enabled])
if test "${enable_plugin_nfacct}" != "no" -a "${have_libnetfilter_acct}" = "yes" \
                                          -a "${have_libmnl}" = "yes" \
                                          -a "${have_nfnetlink_conntrack}" = "yes"; then
    enable_plugin_nfacct="yes"
    AC_DEFINE([HAVE_LIBMNL], [1], [libmnl usability])
    AC_DEFINE([HAVE_LIBNETFILTER_ACCT], [1], [libnetfilter_acct usability])
    AC_DEFINE([HAVE_LINUX_NETFILTER_NFNETLINK_CONNTRACK_H], [1], [libnetfilter_nfnetlink_conntrack header usability])
    OPTIONAL_NFACCT_CFLAGS="${NFACCT_CFLAGS} ${LIBMNL_CFLAGS}"
    OPTIONAL_NFACCT_LIBS="${NFACCT_LIBS} ${LIBMNL_LIBS}"
else
    enable_plugin_nfacct="no"
fi
AC_MSG_RESULT([${enable_plugin_nfacct}])
AM_CONDITIONAL([ENABLE_PLUGIN_NFACCT], [test "${enable_plugin_nfacct}" = "yes"])


# -----------------------------------------------------------------------------
# xenstat.plugin - libxenstat

PKG_CHECK_MODULES(
    [YAJL],
    [yajl],
    [AC_CHECK_LIB(
        [yajl],
        [yajl_tree_get],
        [have_libyajl=yes],
        [have_libyajl=no]
    )],
    [have_libyajl=no]
)

AC_CHECK_LIB(
    [xenstat],
    [xenstat_init],
    [AC_CHECK_HEADER(
        [xenstat.h],
        [have_libxenstat=yes],
        [have_libxenstat=no]
    )],
    [have_libxenstat=no],
    [-lyajl]
)

PKG_CHECK_MODULES(
    [XENLIGHT],
    [xenlight],
    [AC_CHECK_LIB(
        [xenlight],
        [libxl_domain_info],
        [AC_CHECK_HEADER(
            [libxl.h],
            [have_libxenlight=yes],
            [have_libxenlight=no]
        )],
        [have_libxenlight=no]
    )],
    [have_libxenlight=no]
)

test "${enable_plugin_xenstat}" = "yes" -a "${have_libxenstat}" != "yes" && \
    AC_MSG_ERROR([libxenstat required but not found. try installing 'xen-dom0-libs-devel'])

test "${enable_plugin_xenstat}" = "yes" -a "${have_libxenlight}" != "yes" && \
    AC_MSG_ERROR([libxenlight required but not found. try installing 'xen-dom0-libs-devel'])

test "${enable_plugin_xenstat}" = "yes" -a "${have_libyajl}" != "yes" && \
    AC_MSG_ERROR([libyajl required but not found. Try installing 'yajl-devel'])

AC_MSG_CHECKING([if xenstat.plugin should be enabled])
if test "${enable_plugin_xenstat}" != "no" -a "${have_libxenstat}" = "yes" -a "${have_libxenlight}" = "yes" -a "${have_libyajl}" = "yes"; then
    enable_plugin_xenstat="yes"
    AC_DEFINE([HAVE_LIBXENSTAT], [1], [libxenstat usability])
    AC_DEFINE([HAVE_LIBXENLIGHT], [1], [libxenlight usability])
    AC_DEFINE([HAVE_LIBYAJL], [1], [libyajl usability])
    OPTIONAL_XENSTAT_CFLAGS="${XENLIGHT_CFLAGS} ${YAJL_CFLAGS}"
    OPTIONAL_XENSTAT_LIBS="-lxenstat ${XENLIGHT_LIBS} ${YAJL_LIBS}"
else
    enable_plugin_xenstat="no"
fi
AC_MSG_RESULT([${enable_plugin_xenstat}])
AM_CONDITIONAL([ENABLE_PLUGIN_XENSTAT], [test "${enable_plugin_xenstat}" = "yes"])

if test "${enable_plugin_xenstat}" == "yes"; then
    AC_MSG_CHECKING([for xenstat_vbd_error in -lxenstat])
    AC_TRY_LINK(
        [ #include <xenstat.h> ],
        [
            xenstat_vbd * vbd;
            int out = xenstat_vbd_error(vbd);
        ],
        [
            have_xenstat_vbd_error=yes
            AC_DEFINE([HAVE_XENSTAT_VBD_ERROR], [1], [xenstat_vbd_error usability])
        ],
        [ have_xenstat_vbd_error=no ]
    )
    AC_MSG_RESULT([${have_xenstat_vbd_error}])
fi

# -----------------------------------------------------------------------------
# perf.plugin

AC_CHECK_HEADER(
    [linux/perf_event.h],
    [AC_CHECK_DECL(
        [PERF_COUNT_HW_REF_CPU_CYCLES],
        [have_perf_event=yes],
        [have_perf_event=no],
        [#include <linux/perf_event.h>]
    )],
    [have_perf_event=no]
)

AC_MSG_CHECKING([if perf.plugin should be enabled])
if test "${build_target}" == "linux" -a "${have_perf_event}" = "yes"; then
    AC_DEFINE([ENABLE_PERF_PLUGIN], [1], [perf.plugin])
    enable_plugin_perf="yes"
else
    enable_plugin_perf="no"
fi
AC_MSG_RESULT([${enable_plugin_perf}])
AM_CONDITIONAL([ENABLE_PLUGIN_PERF], [test "${enable_plugin_perf}" = "yes"])

# -----------------------------------------------------------------------------
# ebpf.plugin

PKG_CHECK_MODULES(
    [LIBELF],
    [libelf],
    [have_libelf=yes],
    [have_libelf=no]
)

AC_CHECK_TYPE(
    [struct bpf_prog_info],
    [have_bpf=yes],
    [have_bpf=no],
    [#include <linux/bpf.h>]
)

AC_CHECK_FILE(
    externaldeps/libbpf/libbpf.a,
    [have_libbpf=yes],
    [have_libbpf=no]
)

AC_MSG_CHECKING([if ebpf.plugin should be enabled])
if test "${build_target}" = "linux" -a \
        "${enable_ebpf}" != "no" -a \
        "${have_libelf}" = "yes" -a \
        "${have_bpf}" = "yes" -a \
        "${have_libbpf}" = "yes"; then
    OPTIONAL_BPF_CFLAGS="${LIBELF_CFLAGS} -I externaldeps/libbpf/include"
    OPTIONAL_BPF_LIBS="externaldeps/libbpf/libbpf.a ${LIBELF_LIBS}"
    AC_DEFINE([HAVE_LIBBPF], [1], [libbpf usability])
    enable_ebpf="yes"
else
    enable_ebpf="no"
fi
AC_MSG_RESULT([${enable_ebpf}])
AM_CONDITIONAL([ENABLE_PLUGIN_EBPF], [test "${enable_ebpf}" = "yes"])

# -----------------------------------------------------------------------------
# slabinfo.plugin

AC_MSG_CHECKING([if slabinfo.plugin should be enabled])
if test "${build_target}" == "linux"; then
    AC_DEFINE([ENABLE_SLABINFO], [1], [slabinfo plugin])
    enable_plugin_slabinfo="yes"
else
    enable_plugin_slabinfo="no"
fi
AC_MSG_RESULT([${enable_plugin_slabinfo}])
AM_CONDITIONAL([ENABLE_PLUGIN_SLABINFO], [test "${enable_plugin_slabinfo}" = "yes"])


# -----------------------------------------------------------------------------
# AWS Kinesis backend - libaws-cpp-sdk-kinesis, libaws-cpp-sdk-core, libssl, libcrypto, libcurl

PKG_CHECK_MODULES(
    [LIBCRYPTO],
    [libcrypto],
    [AC_CHECK_LIB(
        [crypto],
        [CRYPTO_new_ex_data],
        [have_libcrypto=yes],
        [have_libcrypto=no]
    )],
    [have_libcrypto=no]
)

PKG_CHECK_MODULES(
    [LIBSSL],
    [libssl],
    [AC_CHECK_LIB(
        [ssl],
        [SSL_connect],
        [have_libssl=yes],
        [have_libssl=no]
    )],
    [have_libssl=no]
)

PKG_CHECK_MODULES(
    [LIBCURL],
    [libcurl],
    [AC_CHECK_LIB(
        [curl],
        [curl_easy_init],
        [have_libcurl=yes],
        [have_libcurl=no]
    )],
    [have_libcurl=no]
)

PKG_CHECK_MODULES(
    [AWS_CPP_SDK_CORE],
    [aws-cpp-sdk-core],
    [AC_CHECK_LIB(
        [aws-cpp-sdk-core],
        [cJSON_free],
        [have_libaws_cpp_sdk_core=yes],
        [have_libaws_cpp_sdk_core=no]
    )],
    [have_libaws_cpp_sdk_core=no]
)

PKG_CHECK_MODULES(
    [AWS_CPP_SDK_KINESIS],
    [aws-cpp-sdk-kinesis],
    [have_libaws_cpp_sdk_kinesis=yes],
    [have_libaws_cpp_sdk_kinesis=no]
)

AC_CHECK_LIB(
    [aws-checksums],
    [aws_checksums_crc32],
    [have_libaws_checksums=yes],
    [have_libaws_checksums=no]
)

AC_CHECK_LIB(
    [aws-c-common],
    [aws_default_allocator],
    [have_libaws_c_common=yes],
    [have_libaws_c_common=no]
)

AC_CHECK_LIB(
    [aws-c-event-stream],
    [aws_event_stream_library_init],
    [have_libaws_c_event_stream=yes],
    [have_libaws_c_event_stream=no]
)

test "${enable_backend_kinesis}" = "yes" -a "${have_libaws_cpp_sdk_kinesis}" != "yes" && \
    AC_MSG_ERROR([libaws-cpp-sdk-kinesis required but not found. try installing AWS C++ SDK])

test "${enable_backend_kinesis}" = "yes" -a "${have_libaws_cpp_sdk_core}" != "yes" && \
    AC_MSG_ERROR([libaws-cpp-sdk-core required but not found. try installing AWS C++ SDK])

test "${enable_backend_kinesis}" = "yes" -a "${have_libcurl}" != "yes" && \
    AC_MSG_ERROR([libcurl required but not found])

test "${enable_backend_kinesis}" = "yes" -a "${have_libssl}" != "yes" && \
    AC_MSG_ERROR([libssl required but not found])

test "${enable_backend_kinesis}" = "yes" -a "${have_libcrypto}" != "yes" && \
    AC_MSG_ERROR([libcrypto required but not found])

test "${enable_backend_kinesis}" = "yes" -a "${have_libaws_checksums}" != "yes" \
                                         -a "${have_libaws_c_common}" != "yes" \
                                         -a "${have_libaws_c_event_stream}" != "yes" && \
    AC_MSG_ERROR([AWS SKD third party dependencies required but not found])

AC_MSG_CHECKING([if kinesis backend should be enabled])
if test "${enable_backend_kinesis}" != "no" -a "${have_libaws_cpp_sdk_kinesis}" = "yes" \
                                            -a "${have_libaws_cpp_sdk_core}" = "yes" \
                                            -a "${have_libaws_checksums}" = "yes" \
                                            -a "${have_libaws_c_common}" = "yes" \
                                            -a "${have_libaws_c_event_stream}" = "yes" \
                                            -a "${have_libcurl}" = "yes" \
                                            -a "${have_libssl}" = "yes" \
                                            -a "${have_libcrypto}" = "yes"; then
    enable_backend_kinesis="yes"
    AC_DEFINE([HAVE_KINESIS], [1], [libaws-cpp-sdk-kinesis usability])
    OPTIONAL_KINESIS_CFLAGS="${LIBCRYPTO_CFLAGS} ${LIBSSL_CFLAGS} ${LIBCURL_CFLAGS}"
    CXX11FLAG="${AWS_CPP_SDK_KINESIS_CFLAGS} ${AWS_CPP_SDK_CORE_CFLAGS}"
    OPTIONAL_KINESIS_LIBS="${AWS_CPP_SDK_KINESIS_LIBS} ${AWS_CPP_SDK_CORE_LIBS} \
                           ${LIBCRYPTO_LIBS} ${LIBSSL_LIBS} ${LIBCURL_LIBS}"
else
    enable_backend_kinesis="no"
fi

AC_MSG_RESULT([${enable_backend_kinesis}])
AM_CONDITIONAL([ENABLE_BACKEND_KINESIS], [test "${enable_backend_kinesis}" = "yes"])


# -----------------------------------------------------------------------------
# Pub/Sub exporting connector - googleapis

PKG_CHECK_MODULES(
    [GRPC],
    [grpc],
    [have_libgrpc=yes],
    [have_libgrpc=no]
)

PKG_CHECK_MODULES(
    [PUBSUB],
    [googleapis_cpp_pubsub_protos],
    [have_pubsub_protos=yes],
    [have_pubsub_protos=no]
)

AC_PATH_PROG([CXX_BINARY], [${CXX}], [no])
AS_IF(
    [test x"${CXX_BINARY}" == x"no"],
    [have_CXX_compiler=no],
    [have_CXX_compiler=yes]
)

test "${enable_pubsub}" = "yes" -a "${have_grpc}" != "yes" && \
    AC_MSG_ERROR([libgrpc required but not found. try installing grpc])

test "${enable_pubsub}" = "yes" -a "${have_pubsub_protos}" != "yes" && \
    AC_MSG_ERROR([libgoogleapis_cpp_pubsub_protos required but not found. try installing googleapis])

test "${enable_backend_prometheus_remote_write}" = "yes" -a "${have_CXX_compiler}" != "yes" && \
    AC_MSG_ERROR([C++ compiler required but not found. try installing g++])

AC_MSG_CHECKING([if pubsub exporting connector should be enabled])
if test "${enable_exporting_pubsub}" != "no" -a "${have_pubsub_protos}" = "yes" -a "${have_CXX_compiler}" = "yes"; then
    enable_exporting_pubsub="yes"
    AC_DEFINE([ENABLE_EXPORTING_PUBSUB], [1], [Pub/Sub API usability])
    OPTIONAL_PUBSUB_CFLAGS="${GRPC_CFLAGS} ${PUBSUB_CFLAGS}"
    CXX11FLAG="-std=c++11"
    OPTIONAL_PUBSUB_LIBS="${GRPC_LIBS} ${PUBSUB_LIBS}"
else
    enable_pubsub="no"
fi

AC_MSG_RESULT([${enable_exporting_pubsub}])
AM_CONDITIONAL([ENABLE_EXPORTING_PUBSUB], [test "${enable_exporting_pubsub}" = "yes"])


# -----------------------------------------------------------------------------
# Prometheus remote write backend - libprotobuf, libsnappy, protoc

PKG_CHECK_MODULES(
    [PROTOBUF],
    [protobuf >= 3],
    [have_libprotobuf=yes],
    [have_libprotobuf=no]
)

AC_MSG_CHECKING([for snappy::RawCompress in -lsnappy])

    AC_LANG_SAVE
    AC_LANG_CPLUSPLUS
    save_LIBS="${LIBS}"
    LIBS="-lsnappy"
    save_CXXFLAGS="${CXXFLAGS}"
    CXXFLAGS="${CXXFLAGS} -std=c++11"

    AC_TRY_LINK(
        [
            #include <stdlib.h>
            #include <snappy.h>
        ],
        [
            const char *input = "test";
            size_t compressed_length;
            char *buffer = (char *)malloc(5 * sizeof(char));
            snappy::RawCompress(input, 4, buffer, &compressed_length);
            free(buffer);
        ],
        [
            have_libsnappy=yes
            SNAPPY_CFLAGS=""
            SNAPPY_LIBS="-lsnappy"
        ],
        [have_libsnappy=no]
    )

    LIBS="${save_LIBS}"
    CXXFLAGS="${save_CXXFLAGS}"
    AC_LANG_RESTORE

AC_MSG_RESULT([${have_libsnappy}])

AC_PATH_PROG([PROTOC], [protoc], [no])
AS_IF(
    [test x"${PROTOC}" == x"no"],
    [have_protoc=no],
    [have_protoc=yes]
)

AC_PATH_PROG([CXX_BINARY], [${CXX}], [no])
AS_IF(
    [test x"${CXX_BINARY}" == x"no"],
    [have_CXX_compiler=no],
    [have_CXX_compiler=yes]
)

test "${enable_backend_prometheus_remote_write}" = "yes" -a "${have_libprotobuf}" != "yes" && \
    AC_MSG_ERROR([libprotobuf required but not found. try installing protobuf])

test "${enable_backend_prometheus_remote_write}" = "yes" -a "${have_libsnappy}" != "yes" && \
    AC_MSG_ERROR([libsnappy required but not found. try installing snappy])

test "${enable_backend_prometheus_remote_write}" = "yes" -a "${have_protoc}" != "yes" && \
    AC_MSG_ERROR([protoc compiler required but not found. try installing protobuf])

test "${enable_backend_prometheus_remote_write}" = "yes" -a "${have_CXX_compiler}" != "yes" && \
    AC_MSG_ERROR([C++ compiler required but not found. try installing g++])

AC_MSG_CHECKING([if prometheus remote write backend should be enabled])
if test "${enable_backend_prometheus_remote_write}" != "no" -a "${have_libprotobuf}" = "yes" -a "${have_libsnappy}" = "yes" \
                                                           -a "${have_protoc}" = "yes" -a "${have_CXX_compiler}" = "yes"; then
    enable_backend_prometheus_remote_write="yes"
    AC_DEFINE([ENABLE_PROMETHEUS_REMOTE_WRITE], [1], [Prometheus remote write API usability])
    OPTIONAL_PROMETHEUS_REMOTE_WRITE_CFLAGS="${PROTOBUF_CFLAGS} ${SNAPPY_CFLAGS} -Iexporting/prometheus/remote_write"
    CXX11FLAG="-std=c++11"
    OPTIONAL_PROMETHEUS_REMOTE_WRITE_LIBS="${PROTOBUF_LIBS} ${SNAPPY_LIBS}"
else
    enable_backend_prometheus_remote_write="no"
fi

AC_MSG_RESULT([${enable_backend_prometheus_remote_write}])
AM_CONDITIONAL([ENABLE_BACKEND_PROMETHEUS_REMOTE_WRITE], [test "${enable_backend_prometheus_remote_write}" = "yes"])


# -----------------------------------------------------------------------------
# MongoDB backend - libmongoc

PKG_CHECK_MODULES(
    [LIBMONGOC],
    [libmongoc-1.0 >= 1.7],
    [have_libmongoc=yes],
    [have_libmongoc=no]
)

test "${enable_backend_mongodb}" = "yes" -a "${have_libmongoc}" != "yes" && \
    AC_MSG_ERROR([libmongoc required but not found. Try installing `mongoc`.])

AC_MSG_CHECKING([if mongodb backend should be enabled])
if test "${enable_backend_mongodb}" != "no" -a "${have_libmongoc}" = "yes"; then
    enable_backend_mongodb="yes"
    AC_DEFINE([HAVE_MONGOC], [1], [libmongoc usability])
    OPTIONAL_MONGOC_CFLAGS="${LIBMONGOC_CFLAGS}"
    OPTIONAL_MONGOC_LIBS="${LIBMONGOC_LIBS}"
else
    enable_backend_mongodb="no"
fi

AC_MSG_RESULT([${enable_backend_mongodb}])
AM_CONDITIONAL([ENABLE_BACKEND_MONGODB], [test "${enable_backend_mongodb}" = "yes"])


# -----------------------------------------------------------------------------
# check for setns() - cgroup-network

AC_CHECK_FUNC([setns])
AC_MSG_CHECKING([if cgroup-network can be enabled])
if test "$ac_cv_func_setns" = "yes" ; then
    have_setns="yes"
    AC_DEFINE([HAVE_SETNS], [1], [Define 1 if you have setns() function])
else
    have_setns="no"
fi
AC_MSG_RESULT([${have_setns}])
AM_CONDITIONAL([ENABLE_PLUGIN_CGROUP_NETWORK], [test "${have_setns}" = "yes"])


# -----------------------------------------------------------------------------
# Link-Time-Optimization

if test "${enable_lto}" != "no"; then
    opt="-flto"
    AX_CHECK_COMPILE_FLAG(${opt}, [have_lto=yes], [have_lto=no])
fi
if test "${have_lto}" = "yes"; then
    oCFLAGS="${CFLAGS}"
    CFLAGS="${CFLAGS} -flto"
    ac_cv_c_lto_cross_compile="${enable_lto}"
    test "${ac_cv_c_lto_cross_compile}" != "yes" && ac_cv_c_lto_cross_compile="no"
    AC_C_LTO
    CFLAGS="${oCFLAGS}"
    test "${ac_cv_c_lto}" != "yes" && have_lto="no"
fi
test "${enable_lto}" = "yes" -a "${have_lto}" != "yes" && \
    AC_MSG_ERROR([LTO is required but is not available.])
AC_MSG_CHECKING([if LTO should be enabled])
if test "${enable_lto}" != "no" -a "${have_lto}" = "yes"; then
    enable_lto="yes"
    CFLAGS="${CFLAGS} -flto"
else
    enable_lto="no"
fi
AC_MSG_RESULT([${enable_lto}])


# -----------------------------------------------------------------------------

AM_CONDITIONAL([ENABLE_CXX_LINKER], [test "${enable_backend_kinesis}" = "yes" \
                                     -o "${enable_exporting_pubsub}" = "yes" \
                                     -o "${enable_backend_prometheus_remote_write}" = "yes"])

AC_DEFINE_UNQUOTED([NETDATA_USER], ["${with_user}"], [use this user to drop privileged])

varlibdir="${localstatedir}/lib/netdata"
registrydir="${localstatedir}/lib/netdata/registry"
cachedir="${localstatedir}/cache/netdata"
chartsdir="${libexecdir}/netdata/charts.d"
nodedir="${libexecdir}/netdata/node.d"
pythondir="${libexecdir}/netdata/python.d"
configdir="${sysconfdir}/netdata"
libconfigdir="${libdir}/netdata/conf.d"
logdir="${localstatedir}/log/netdata"
pluginsdir="${libexecdir}/netdata/plugins.d"

AC_SUBST([build_target])
AC_SUBST([varlibdir])
AC_SUBST([registrydir])
AC_SUBST([cachedir])
AC_SUBST([chartsdir])
AC_SUBST([nodedir])
AC_SUBST([pythondir])
AC_SUBST([configdir])
AC_SUBST([libconfigdir])
AC_SUBST([logdir])
AC_SUBST([pluginsdir])
AC_SUBST([webdir])

CFLAGS="${CFLAGS} ${OPTIONAL_MATH_CFLAGS} ${OPTIONAL_NFACCT_CFLAGS} ${OPTIONAL_ZLIB_CFLAGS} ${OPTIONAL_UUID_CFLAGS} \
    ${OPTIONAL_LIBCAP_CFLAGS} ${OPTIONAL_IPMIMONITORING_CFLAGS} ${OPTIONAL_CUPS_CFLAGS} ${OPTIONAL_XENSTAT_FLAGS} \
    ${OPTIONAL_KINESIS_CFLAGS} ${OPTIONAL_PUBSUB_CFLAGS} ${OPTIONAL_PROMETHEUS_REMOTE_WRITE_CFLAGS} \
    ${OPTIONAL_MONGOC_CFLAGS} ${LWS_CFLAGS} ${OPTIONAL_JSONC_STATIC_CFLAGS} ${OPTIONAL_BPF_CFLAGS} ${OPTIONAL_JUDY_CFLAGS}"

CXXFLAGS="${CFLAGS} ${CXX11FLAG}"

CPPFLAGS="\
    -DTARGET_OS=${build_target_id} \
	-DVARLIB_DIR=\"\\\"${varlibdir}\\\"\" \
	-DCACHE_DIR=\"\\\"${cachedir}\\\"\" \
	-DCONFIG_DIR=\"\\\"${configdir}\\\"\" \
	-DLIBCONFIG_DIR=\"\\\"${libconfigdir}\\\"\" \
	-DLOG_DIR=\"\\\"${logdir}\\\"\" \
	-DPLUGINS_DIR=\"\\\"${pluginsdir}\\\"\" \
	-DRUN_DIR=\"\\\"${localstatedir}/run/netdata\\\"\" \
	-DWEB_DIR=\"\\\"${webdir}\\\"\" \
"

AC_SUBST([OPTIONAL_MATH_CFLAGS])
AC_SUBST([OPTIONAL_MATH_LIBS])
AC_SUBST([OPTIONAL_UV_LIBS])
AC_SUBST([OPTIONAL_LZ4_LIBS])
AC_SUBST([OPTIONAL_JUDY_CFLAGS])
AC_SUBST([OPTIONAL_JUDY_LIBS])
AC_SUBST([OPTIONAL_SSL_LIBS])
AC_SUBST([OPTIONAL_JSONC_LIBS])
AC_SUBST([OPTIONAL_NFACCT_CFLAGS])
AC_SUBST([OPTIONAL_NFACCT_LIBS])
AC_SUBST([OPTIONAL_ZLIB_CFLAGS])
AC_SUBST([OPTIONAL_ZLIB_LIBS])
AC_SUBST([OPTIONAL_UUID_CFLAGS])
AC_SUBST([OPTIONAL_UUID_LIBS])
AC_SUBST([OPTIONAL_BPF_CFLAGS])
AC_SUBST([OPTIONAL_BPF_LIBS])
AC_SUBST([OPTIONAL_MQTT_LIBS])
AC_SUBST([OPTIONAL_LIBCAP_CFLAGS])
AC_SUBST([OPTIONAL_LIBCAP_LIBS])
AC_SUBST([OPTIONAL_IPMIMONITORING_CFLAGS])
AC_SUBST([OPTIONAL_IPMIMONITORING_LIBS])
AC_SUBST([OPTIONAL_CUPS_CFLAGS])
AC_SUBST([OPTIONAL_CUPS_LIBS])
AC_SUBST([OPTIONAL_XENSTAT_CFLAGS])
AC_SUBST([OPTIONAL_XENSTAT_LIBS])
AC_SUBST([OPTIONAL_KINESIS_CFLAGS])
AC_SUBST([OPTIONAL_KINESIS_LIBS])
AC_SUBST([OPTIONAL_PUBSUB_CFLAGS])
AC_SUBST([OPTIONAL_PUBSUB_LIBS])
AC_SUBST([OPTIONAL_PROMETHEUS_REMOTE_WRITE_CFLAGS])
AC_SUBST([OPTIONAL_PROMETHEUS_REMOTE_WRITE_LIBS])
AC_SUBST([OPTIONAL_MONGOC_CFLAGS])
AC_SUBST([OPTIONAL_MONGOC_LIBS])

# -----------------------------------------------------------------------------
# Check if cmocka is available - needed for unit testing

AC_ARG_ENABLE(
     [unit-tests],
     [AS_HELP_STRING([--disable-unit-tests],
                     [Disables building and running the unit tests suite])],
     [],
     [enable_unit_tests="yes"]
)


PKG_CHECK_MODULES(
    [CMOCKA],
    [cmocka],
    [have_cmocka="yes"],
    [AC_MSG_NOTICE([CMocka not found on the system. Unit tests disabled])]
)
AM_CONDITIONAL([ENABLE_UNITTESTS], [test "${enable_unit_tests}" = "yes" -a "${have_cmocka}" = "yes" ])
AC_SUBST([ENABLE_UNITTESTS])

TEST_CFLAGS="${CFLAGS} ${CMOCKA_CFLAGS}"
TEST_LIBS="${CMOCKA_LIBS}"

AC_SUBST([TEST_CFLAGS])
AC_SUBST([TEST_LIBS])

# -----------------------------------------------------------------------------
# save configure options for build info
AC_DEFINE_UNQUOTED(
    [CONFIGURE_COMMAND],
    ["$ac_configure_args"],
    [options passed to configure script]
)

AC_CONFIG_FILES([
    Makefile
    netdata.spec
    backends/graphite/Makefile
    backends/json/Makefile
    backends/Makefile
    backends/opentsdb/Makefile
    backends/prometheus/Makefile
    backends/prometheus/remote_write/Makefile
    backends/aws_kinesis/Makefile
    backends/mongodb/Makefile
    collectors/Makefile
    collectors/apps.plugin/Makefile
    collectors/cgroups.plugin/Makefile
    collectors/charts.d.plugin/Makefile
    collectors/checks.plugin/Makefile
    collectors/diskspace.plugin/Makefile
    collectors/fping.plugin/Makefile
    collectors/ioping.plugin/Makefile
    collectors/freebsd.plugin/Makefile
    collectors/freeipmi.plugin/Makefile
    collectors/cups.plugin/Makefile
    collectors/idlejitter.plugin/Makefile
    collectors/macos.plugin/Makefile
    collectors/nfacct.plugin/Makefile
    collectors/node.d.plugin/Makefile
    collectors/plugins.d/Makefile
    collectors/proc.plugin/Makefile
    collectors/python.d.plugin/Makefile
    collectors/slabinfo.plugin/Makefile
    collectors/statsd.plugin/Makefile
    collectors/ebpf.plugin/Makefile
    collectors/tc.plugin/Makefile
    collectors/xenstat.plugin/Makefile
    collectors/perf.plugin/Makefile
    daemon/Makefile
    database/Makefile
    database/engine/Makefile
    database/engine/metadata_log/Makefile
    database/engine/global_uuid_map/Makefile
    diagrams/Makefile
    exporting/Makefile
    exporting/graphite/Makefile
    exporting/json/Makefile
    exporting/opentsdb/Makefile
    exporting/prometheus/Makefile
    exporting/prometheus/remote_write/Makefile
    exporting/aws_kinesis/Makefile
    exporting/pubsub/Makefile
    exporting/mongodb/Makefile
    exporting/tests/Makefile
    health/Makefile
    health/notifications/Makefile
    libnetdata/Makefile
    libnetdata/tests/Makefile
    libnetdata/adaptive_resortable_list/Makefile
    libnetdata/avl/Makefile
    libnetdata/buffer/Makefile
    libnetdata/clocks/Makefile
    libnetdata/config/Makefile
    libnetdata/dictionary/Makefile
    libnetdata/ebpf/Makefile
    libnetdata/eval/Makefile
    libnetdata/locks/Makefile
    libnetdata/log/Makefile
    libnetdata/popen/Makefile
    libnetdata/procfile/Makefile
    libnetdata/simple_pattern/Makefile
    libnetdata/socket/Makefile
    libnetdata/statistical/Makefile
    libnetdata/storage_number/Makefile
    libnetdata/storage_number/tests/Makefile
    libnetdata/threads/Makefile
    libnetdata/url/Makefile
    libnetdata/json/Makefile
    libnetdata/health/Makefile
    registry/Makefile
    streaming/Makefile
    system/Makefile
    tests/Makefile
    web/Makefile
    web/api/Makefile
    web/api/badges/Makefile
    web/api/exporters/Makefile
    web/api/exporters/shell/Makefile
    web/api/exporters/prometheus/Makefile
    web/api/formatters/Makefile
    web/api/formatters/csv/Makefile
    web/api/formatters/json/Makefile
    web/api/formatters/ssv/Makefile
    web/api/formatters/value/Makefile
    web/api/queries/Makefile
    web/api/queries/average/Makefile
    web/api/queries/des/Makefile
    web/api/queries/incremental_sum/Makefile
    web/api/queries/max/Makefile
    web/api/queries/median/Makefile
    web/api/queries/min/Makefile
    web/api/queries/ses/Makefile
    web/api/queries/stddev/Makefile
    web/api/queries/sum/Makefile
    web/api/health/Makefile
    web/gui/Makefile
    web/server/Makefile
    web/server/static/Makefile
    claim/Makefile
    aclk/Makefile
    spawn/Makefile
    parser/Makefile
])
AC_OUTPUT

test "${with_math}" != "yes" && AC_MSG_WARN([You are building without math. math allows accurate calculations. It should be enabled.]) || :
test "${with_zlib}" != "yes" && AC_MSG_WARN([You are building without zlib. zlib allows netdata to transfer a lot less data with web clients. It should be enabled.]) || :