configure.ac

   1 AC_PREREQ(2.60)
   2 AC_INIT(connman, 1.37)
   3
   4 AC_CONFIG_MACRO_DIR([m4])
   5
   6 AM_INIT_AUTOMAKE([foreign subdir-objects color-tests])
   7 AC_CONFIG_HEADERS([config.h])
   8
   9 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
  10
  11 AM_MAINTAINER_MODE
  12
  13 AC_PREFIX_DEFAULT(/usr/local)
  14
  15 PKG_PROG_PKG_CONFIG
  16
  17 COMPILER_FLAGS
  18
  19 AC_SUBST(abs_top_srcdir)
  20 AC_SUBST(abs_top_builddir)
  21
  22 AC_LANG_C
  23 AC_USE_SYSTEM_EXTENSIONS
  24
  25 AC_PROG_CC
  26 AM_PROG_CC_C_O
  27 AC_PROG_CC_PIE
  28 AC_PROG_INSTALL
  29 AC_PROG_MKDIR_P
  30
  31 m4_define([_LT_AC_TAGCONFIG], [])
  32 m4_ifdef([AC_LIBTOOL_TAGS], [AC_LIBTOOL_TAGS([])])
  33
  34 AC_DISABLE_STATIC
  35 AC_PROG_LIBTOOL
  36
  37 gl_CONFIGMAKE_PREP
  38
  39 AC_ARG_ENABLE(optimization, AC_HELP_STRING([--disable-optimization],
  40                         [disable code optimization through compiler]), [
  41         if (test "${enableval}" = "no"); then
  42                 CFLAGS="$CFLAGS -O0 -U_FORTIFY_SOURCE"
  43         fi
  44 ])
  45
  46 AC_ARG_ENABLE(debug, AC_HELP_STRING([--enable-debug],
  47                         [enable compiling with debugging information]), [
  48         if (test "${enableval}" = "yes" &&
  49                                 test "${ac_cv_prog_cc_g}" = "yes"); then
  50                 CFLAGS="$CFLAGS -g"
  51         fi
  52 ])
  53
  54 AC_ARG_ENABLE(pie, AC_HELP_STRING([--enable-pie],
  55                         [enable position independent executables flag]), [
  56         if (test "${enableval}" = "yes" &&
  57                                 test "${ac_cv_prog_cc_pie}" = "yes"); then
  58                 CFLAGS="$CFLAGS -fPIE"
  59                 LDFLAGS="$LDFLAGS -pie"
  60         fi
  61 ])
  62
  63 AC_ARG_ENABLE(hh2serial-gps,
  64         AC_HELP_STRING([--enable-hh2serial-gps], [enable hh2serial GPS support]),
  65                         [enable_hh2serial_gps=${enableval}], [enable_hh2serial_gps="no"])
  66 AM_CONDITIONAL(HH2SERIAL_GPS, test "${enable_hh2serial_gps}" != "no")
  67 AM_CONDITIONAL(HH2SERIAL_GPS_BUILTIN, test "${enable_hh2serial_gps}" = "builtin")
  68
  69 AC_ARG_WITH(openconnect, AC_HELP_STRING([--with-openconnect=PROGRAM],
  70         [specify location of openconnect binary]), [path_openconnect=${withval}])
  71
  72 AC_ARG_ENABLE(openconnect,
  73         AC_HELP_STRING([--enable-openconnect], [enable openconnect support]),
  74                         [enable_openconnect=${enableval}], [enable_openconnect="no"])
  75 if (test "${enable_openconnect}" != "no"); then
  76         if (test -z "${path_openconnect}"); then
  77                 AC_PATH_PROG(OPENCONNECT, [openconnect], [], $PATH:/sbin:/usr/sbin)
  78                 if (test -z "${OPENCONNECT}"); then
  79                         AC_MSG_ERROR(openconnect binary not found)
  80                 fi
  81         else
  82                 OPENCONNECT="${path_openconnect}"
  83                 AC_SUBST(OPENCONNECT)
  84         fi
  85 fi
  86 AM_CONDITIONAL(OPENCONNECT, test "${enable_openconnect}" != "no")
  87 AM_CONDITIONAL(OPENCONNECT_BUILTIN, test "${enable_openconnect}" = "builtin")
  88
  89 AC_ARG_WITH(openvpn, AC_HELP_STRING([--with-openvpn=PROGRAM],
  90         [specify location of openvpn binary]), [path_openvpn=${withval}])
  91
  92 AC_ARG_ENABLE(openvpn,
  93         AC_HELP_STRING([--enable-openvpn], [enable openvpn support]),
  94                         [enable_openvpn=${enableval}], [enable_openvpn="no"])
  95 if (test "${enable_openvpn}" != "no"); then
  96         if (test -z "${path_openvpn}"); then
  97                 AC_PATH_PROG(OPENVPN, [openvpn], [], $PATH:/sbin:/usr/sbin)
  98                 if (test -z "${OPENVPN}"); then
  99                         AC_MSG_ERROR(openvpn binary not found)
 100                 fi
 101         else
 102                 OPENVPN="${path_openvpn}"
 103                 AC_SUBST(OPENVPN)
 104         fi
 105 fi
 106 AM_CONDITIONAL(OPENVPN, test "${enable_openvpn}" != "no")
 107 AM_CONDITIONAL(OPENVPN_BUILTIN, test "${enable_openvpn}" = "builtin")
 108
 109 AC_ARG_WITH(vpnc, AC_HELP_STRING([--with-vpnc=PROGRAM],
 110         [specify location of vpnc binary]), [path_vpnc=${withval}])
 111
 112 AC_ARG_ENABLE(vpnc,
 113         AC_HELP_STRING([--enable-vpnc], [enable vpnc support]),
 114                 [enable_vpnc=${enableval}], [enable_vpnc="no"])
 115 if (test "${enable_vpnc}" != "no"); then
 116         if (test -z "${path_vpnc}"); then
 117                 AC_PATH_PROG(VPNC, [vpnc], [], $PATH:/sbin:/usr/sbin)
 118                 if (test -z "${VPNC}"); then
 119                         AC_MSG_ERROR(vpnc binary not found)
 120                 fi
 121         else
 122                 VPNC="${path_vpnc}"
 123                 AC_SUBST(VPNC)
 124         fi
 125 fi
 126 AM_CONDITIONAL(VPNC, test "${enable_vpnc}" != "no")
 127 AM_CONDITIONAL(VPNC_BUILTIN, test "${enable_vpnc}" = "builtin")
 128
 129 AC_ARG_WITH(l2tp, AC_HELP_STRING([--with-l2tp=PROGRAM],
 130         [specify location of l2tp binary]), [path_l2tp=${withval}])
 131
 132 AC_ARG_ENABLE(l2tp,
 133         AC_HELP_STRING([--enable-l2tp], [enable l2tp support]),
 134                         [enable_l2tp=${enableval}], [enable_l2tp="no"])
 135 if (test "${enable_l2tp}" != "no"); then
 136         if (test -z "${path_pppd}"); then
 137                 AC_PATH_PROG(PPPD, [pppd], [/usr/sbin/pppd], $PATH:/sbin:/usr/sbin)
 138         else
 139                 PPPD="${path_pppd}"
 140                 AC_SUBST(PPPD)
 141         fi
 142         AC_CHECK_HEADERS(pppd/pppd.h, dummy=yes,
 143                         AC_MSG_ERROR(ppp header files are required))
 144         if (test -z "${path_l2tp}"); then
 145                 AC_PATH_PROG(L2TP, [xl2tpd], [/usr/sbin/xl2tpd], $PATH:/sbin:/usr/sbin)
 146         else
 147                 L2TP="${path_l2tp}"
 148                 AC_SUBST(L2TP)
 149         fi
 150 fi
 151 AM_CONDITIONAL(L2TP, test "${enable_l2tp}" != "no")
 152 AM_CONDITIONAL(L2TP_BUILTIN, test "${enable_l2tp}" = "builtin")
 153
 154 AC_ARG_WITH(pptp, AC_HELP_STRING([--with-pptp=PROGRAM],
 155         [specify location of pptp binary]), [path_pptp=${withval}])
 156
 157 AC_ARG_ENABLE(pptp,
 158         AC_HELP_STRING([--enable-pptp], [enable pptp support]),
 159                         [enable_pptp=${enableval}], [enable_pptp="no"])
 160 if (test "${enable_pptp}" != "no"); then
 161         if (test -z "${path_pppd}"); then
 162                 AC_PATH_PROG(PPPD, [pppd], [/usr/sbin/pppd], $PATH:/sbin:/usr/sbin)
 163         else
 164                 PPPD="${path_pppd}"
 165                 AC_SUBST(PPPD)
 166         fi
 167         AC_CHECK_HEADERS(pppd/pppd.h, dummy=yes,
 168                         AC_MSG_ERROR(ppp header files are required))
 169         if (test -z "${path_pptp}"); then
 170                 AC_PATH_PROG(PPTP, [pptp], [/usr/sbin/pptp], $PATH:/sbin:/usr/sbin)
 171         else
 172                 PPTP="${path_pptp}"
 173                 AC_SUBST(PPTP)
 174         fi
 175 fi
 176 AM_CONDITIONAL(PPTP, test "${enable_pptp}" != "no")
 177 AM_CONDITIONAL(PPTP_BUILTIN, test "${enable_pptp}" = "builtin")
 178
 179 AC_CHECK_HEADERS(resolv.h, dummy=yes,
 180         AC_MSG_ERROR(resolver header files are required))
 181 AC_CHECK_LIB(resolv, ns_initparse, dummy=yes, [
 182         AC_CHECK_LIB(resolv, __ns_initparse, dummy=yes,
 183                 AC_MSG_ERROR(resolver library support is required))
 184 ])
 185
 186 AC_CHECK_HEADERS([execinfo.h])
 187 AM_CONDITIONAL([BACKTRACE], [test "${ac_cv_header_execinfo_h}" = "yes"])
 188
 189 AC_CHECK_MEMBERS([struct in6_pktinfo.ipi6_addr], [], [], [[#include <netinet/in.h>]])
 190
 191 AC_CHECK_FUNC(signalfd, dummy=yes,
 192                         AC_MSG_ERROR(signalfd support is required))
 193
 194 AC_CHECK_LIB(dl, dlopen, dummy=yes,
 195                         AC_MSG_ERROR(dynamic linking loader is required))
 196
 197 AC_ARG_ENABLE(iospm, AC_HELP_STRING([--enable-iospm],
 198                 [enable Intel OSPM support]), [enable_iospm=${enableval}])
 199 AM_CONDITIONAL(IOSPM, test "${enable_iospm}" = "yes")
 200
 201 AC_ARG_ENABLE(tist,
 202         AC_HELP_STRING([--enable-tist], [enable TI Shared Transport support]),
 203                         [enable_tist=${enableval}], [enable_tist="no"])
 204 AM_CONDITIONAL(TIST, test "${enable_tist}" != "no")
 205 AM_CONDITIONAL(TIST_BUILTIN, test "${enable_tist}" = "builtin")
 206
 207 AC_ARG_ENABLE(session-policy-local,
 208         AC_HELP_STRING([--enable-session-policy-local], [enable local file Session policy configuration support]),
 209                         [enable_session_policy_local=${enableval}], [enable_session_policy_local="no"])
 210 AM_CONDITIONAL(SESSION_POLICY_LOCAL, test "${enable_session_policy_local}" != "no")
 211 AM_CONDITIONAL(SESSION_POLICY_LOCAL_BUILTIN, test "${enable_session_policy_local}" = "builtin")
 212
 213 AC_ARG_WITH(stats-max-file-size, AC_HELP_STRING([--with-stats-max-file-size=SIZE],
 214                         [Maximal size of a statistics round robin file]),
 215                         [stats_max_file_size=${withval}])
 216
 217 if (test -z "${stats_max_file_size}"); then
 218    # default size is 16 kByte
 219    stats_max_file_size="16 * 8 * 128"
 220 fi
 221
 222 AC_DEFINE_UNQUOTED([STATS_MAX_FILE_SIZE], (${stats_max_file_size}), [Maximal size of a statistics round robin file])
 223
 224 PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.40, dummy=yes,
 225                                 AC_MSG_ERROR(GLib >= 2.40 is required))
 226 AC_SUBST(GLIB_CFLAGS)
 227 AC_SUBST(GLIB_LIBS)
 228
 229 PKG_CHECK_MODULES(DBUS, dbus-1 >= 1.4, dummy=yes,
 230                                 AC_MSG_ERROR(D-Bus >= 1.4 is required))
 231 AC_SUBST(DBUS_CFLAGS)
 232 AC_SUBST(DBUS_LIBS)
 233
 234 AC_ARG_WITH(dbusconfdir, AC_HELP_STRING([--with-dbusconfdir=PATH],
 235         [path to D-Bus config directory]), [path_dbusconf=${withval}],
 236                 [path_dbusconf="`$PKG_CONFIG --variable=datadir dbus-1`"])
 237 if (test -z "${path_dbusconf}"); then
 238         DBUS_CONFDIR="${datadir}/dbus-1/system.d"
 239 else
 240         DBUS_CONFDIR="${path_dbusconf}/dbus-1/system.d"
 241 fi
 242 AC_SUBST(DBUS_CONFDIR)
 243
 244 AC_ARG_WITH(dbusdatadir, AC_HELP_STRING([--with-dbusdatadir=PATH],
 245         [path to D-Bus data directory]), [path_dbusdata=${withval}],
 246                 [path_dbusdata="`$PKG_CONFIG --variable=datadir dbus-1`"])
 247 if (test -z "${path_dbusdata}"); then
 248         DBUS_DATADIR="${datadir}/dbus-1/system-services"
 249 else
 250         DBUS_DATADIR="${path_dbusdata}/dbus-1/system-services"
 251 fi
 252 AC_SUBST(DBUS_DATADIR)
 253
 254 AC_ARG_WITH([systemdunitdir], AC_HELP_STRING([--with-systemdunitdir=DIR],
 255         [path to systemd service directory]), [path_systemdunit=${withval}],
 256                 [path_systemdunit="`$PKG_CONFIG --variable=systemdsystemunitdir systemd`"])
 257 if (test -n "${path_systemdunit}"); then
 258         SYSTEMD_UNITDIR="${path_systemdunit}"
 259         AC_SUBST(SYSTEMD_UNITDIR)
 260 fi
 261 AM_CONDITIONAL(SYSTEMD, test -n "${path_systemdunit}")
 262
 263 AC_ARG_WITH([tmpfilesdir], AC_HELP_STRING([--with-tmpfilesdir=DIR],
 264         [path to systemd tmpfiles.d directory]), [path_tmpfiles=${withval}],
 265                 [path_tmpfiles="`$PKG_CONFIG --variable=tmpfilesdir systemd`"])
 266 if (test -n "${path_tmpfiles}"); then
 267         SYSTEMD_TMPFILESDIR="${path_tmpfiles}"
 268         AC_SUBST(SYSTEMD_TMPFILESDIR)
 269 fi
 270
 271 AC_ARG_WITH(firewall, AC_HELP_STRING([--with-firewall=TYPE],
 272                         [specify which firewall type is used iptables or nftables [default=iptables]]),
 273                 [firewall_type=${withval}],
 274                 [firewall_type="iptables"])
 275
 276 if (test "${firewall_type}" != "iptables" -a \
 277                 "${firewall_type}" != "nftables"); then
 278         AC_MSG_ERROR(neither nftables nor iptables support enabled)
 279 fi
 280
 281 found_iptables="no"
 282 if (test "${firewall_type}" = "iptables"); then
 283         PKG_CHECK_MODULES(XTABLES, xtables >= 1.4.11, [found_iptables="yes"],
 284                         AC_MSG_ERROR(Xtables library is required))
 285         AC_SUBST(XTABLES_CFLAGS)
 286         AC_SUBST(XTABLES_LIBS)
 287 fi
 288 AM_CONDITIONAL(XTABLES, test "${found_iptables}" != "no")
 289
 290 found_nftables="no"
 291 if (test "${firewall_type}" = "nftables"); then
 292         PKG_CHECK_MODULES(NFTABLES, [libnftnl >= 1.0.4 libmnl >= 1.0.0], [found_nftables="yes"],
 293                 AC_MSG_ERROR([libnftnl >= 1.0.4 or libmnl >= 1.0.0 not found]))
 294         AC_SUBST(NFTABLES_CFLAGS)
 295         AC_SUBST(NFTABLES_LIBS)
 296 fi
 297 AM_CONDITIONAL(NFTABLES, test "${found_nftables}" != "no")
 298
 299 AC_ARG_ENABLE(test, AC_HELP_STRING([--enable-test],
 300                 [enable test/example scripts]), [enable_test=${enableval}])
 301 AM_CONDITIONAL(TEST, test "${enable_test}" = "yes")
 302
 303 AC_ARG_ENABLE(nmcompat, AC_HELP_STRING([--enable-nmcompat],
 304                                 [enable Network Manager support]),
 305                         [enable_nmcompat=${enableval}], [enable_nmcompat="no"])
 306 AM_CONDITIONAL(NMCOMPAT, test "${enable_nmcompat}" != "no")
 307
 308 AC_ARG_ENABLE(polkit, AC_HELP_STRING([--enable-polkit],
 309                                 [enable PolicyKit support]),
 310                         [enable_polkit=${enableval}], [enable_polkit="no"])
 311 if (test "${enable_polkit}" != "no"); then
 312         POLKIT_DATADIR="`$PKG_CONFIG --variable=actiondir polkit`"
 313         POLKIT_DATADIR=""
 314         if (test -z "${POLKIT_DATADIR}"); then
 315                 POLKIT_DATADIR="${datadir}/polkit-1/actions"
 316         fi
 317         AC_SUBST(POLKIT_DATADIR)
 318 fi
 319 AM_CONDITIONAL(POLKIT, test "${enable_polkit}" != "no")
 320
 321 AC_ARG_ENABLE(selinux, AC_HELP_STRING([--enable-selinux],
 322                                 [enable selinux support]),
 323                         [enable_selinux=${enableval}], [enable_selinux="no"])
 324 AM_CONDITIONAL(SELINUX, test "${enable_selinux}" != "no")
 325
 326 AC_ARG_ENABLE(loopback, AC_HELP_STRING([--disable-loopback],
 327                                 [disable loopback support]),
 328                                         [enable_loopback=${enableval}])
 329 AM_CONDITIONAL(LOOPBACK, test "${enable_loopback}" != "no")
 330
 331 AC_ARG_ENABLE(ethernet, AC_HELP_STRING([--disable-ethernet],
 332                                 [disable Ethernet support]),
 333                                         [enable_ethernet=${enableval}])
 334 AM_CONDITIONAL(ETHERNET, test "${enable_ethernet}" != "no")
 335
 336 AC_ARG_ENABLE(gadget, AC_HELP_STRING([--disable-gadget],
 337                                 [disable USB Gadget support]),
 338                                         [enable_gadget=${enableval}])
 339 AM_CONDITIONAL(GADGET, test "${enable_gadget}" != "no")
 340
 341 AC_ARG_ENABLE(wifi, AC_HELP_STRING([--disable-wifi],
 342                                 [disable WiFi support]),
 343                                         [enable_wifi=${enableval}])
 344 AM_CONDITIONAL(WIFI, test "${enable_wifi}" != "no")
 345
 346 AC_ARG_ENABLE(iwd, AC_HELP_STRING([--enable-iwd],
 347                                 [enable iwd support]),
 348                                         [enable_iwd=${enableval}])
 349 AM_CONDITIONAL(IWD, test "${enable_iwd}" = "yes")
 350
 351 AC_ARG_ENABLE(bluetooth, AC_HELP_STRING([--disable-bluetooth],
 352                                 [disable Bluetooth support]),
 353                                         [enable_bluetooth=${enableval}])
 354 AM_CONDITIONAL(BLUETOOTH, test "${enable_bluetooth}" != "no")
 355
 356 AC_ARG_ENABLE(ofono, AC_HELP_STRING([--disable-ofono],
 357                                 [disable oFono support]),
 358                                         [enable_ofono=${enableval}])
 359 AM_CONDITIONAL(OFONO, test "${enable_ofono}" != "no")
 360
 361 AC_ARG_ENABLE(dundee, AC_HELP_STRING([--disable-dundee],
 362                                 [disable dundee support (Bluetooth DUN)]),
 363                                         [enable_dundee=${enableval}])
 364 AM_CONDITIONAL(DUNDEE, test "${enable_dundee}" != "no")
 365
 366 AC_ARG_ENABLE(pacrunner, AC_HELP_STRING([--disable-pacrunner],
 367                                 [disable PACrunner support]),
 368                                         [enable_pacrunner=${enableval}])
 369 AM_CONDITIONAL(PACRUNNER, test "${enable_pacrunner}" != "no")
 370
 371 AC_ARG_ENABLE(neard, AC_HELP_STRING([--disable-neard],
 372                                 [disable Neard support]),
 373                                         [enable_neard=${enableval}])
 374 AM_CONDITIONAL(NEARD, test "${enable_neard}" != "no")
 375
 376 AC_ARG_ENABLE(wispr, AC_HELP_STRING([--disable-wispr],
 377                                 [disable WISPr support]),
 378                                         [enable_wispr=${enableval}])
 379 AM_CONDITIONAL(WISPR, test "${enable_wispr}" != "no")
 380
 381 AC_ARG_ENABLE(tools, AC_HELP_STRING([--disable-tools],
 382                                 [disable testing tools]),
 383                                         [enable_tools=${enableval}])
 384 AM_CONDITIONAL(TOOLS, test "${enable_tools}" != "no")
 385
 386 AC_ARG_ENABLE(stats, AC_HELP_STRING([--disable-stats],
 387                                 [disable statistics round robin file generation]),
 388                                         [enable_stats=${enableval}])
 389 AM_CONDITIONAL(STATS, test "${enable_stats}" != "no")
 390
 391 if (test "${enable_tools}" != "no"); then
 392         AC_PATH_PROGS(IPTABLES_SAVE, [iptables-save], [],
 393                                                 $PATH:/sbin:/usr/sbin)
 394         AC_PATH_PROGS(IP6TABLES_SAVE, [ip6tables-save], [],
 395                                                 $PATH:/sbin:/usr/sbin)
 396         IPTABLES_SAVE=$ac_cv_path_IPTABLES_SAVE
 397         IP6TABLES_SAVE=$ac_cv_path_IP6TABLES_SAVE
 398 else
 399         IPTABLES_SAVE=""
 400         IP6TABLES_SAVE=""
 401 fi
 402 AC_SUBST(IPTABLES_SAVE)
 403 AC_SUBST(IP6TABLES_SAVE)
 404
 405 AC_ARG_ENABLE(client, AC_HELP_STRING([--disable-client],
 406                                 [disable command line client]),
 407                                         [enable_client=${enableval}])
 408 AM_CONDITIONAL(CLIENT, test "${enable_client}" != "no")
 409
 410 if (test "${enable_wispr}" != "no"); then
 411         PKG_CHECK_MODULES(GNUTLS, gnutls, dummy=yes,
 412                                 AC_MSG_ERROR(GnuTLS library is required))
 413 else
 414         GNUTLS_CFLAGS=""
 415         GNUTLS_LIBS=""
 416 fi
 417 AC_SUBST(GNUTLS_CFLAGS)
 418 AC_SUBST(GNUTLS_LIBS)
 419
 420 if (test "${enable_loopback}" != "no"); then
 421         AC_CHECK_HEADERS(sys/inotify.h, dummy=yes,
 422                         AC_MSG_ERROR(inotify header files are required))
 423
 424         AC_CHECK_LIB(c, inotify_init, dummy=yes,
 425                         AC_MSG_ERROR(inotify library support is required))
 426 fi
 427
 428 if (test "${enable_wifi}" != "no"); then
 429         AC_PATH_PROG(WPASUPPLICANT, [wpa_supplicant], [],
 430                                                 $PATH:/sbin:/usr/sbin)
 431 fi
 432
 433 AC_ARG_ENABLE(datafiles, AC_HELP_STRING([--disable-datafiles],
 434                         [don't install configuration and data files]),
 435                                         [enable_datafiles=${enableval}])
 436 AM_CONDITIONAL(DATAFILES, test "${enable_datafiles}" != "no")
 437
 438 if (test "${enable_client}" != "no"); then
 439         AC_CHECK_HEADERS(readline/readline.h, dummy=yes,
 440                 AC_MSG_ERROR(readline header files are required))
 441 fi
 442
 443 AM_CONDITIONAL(VPN, test "${enable_openconnect}" != "no" -o \
 444                         "${enable_openvpn}" != "no" -o \
 445                         "${enable_vpnc}" != "no" -o \
 446                         "${enable_l2tp}" != "no" -o \
 447                         "${enable_pptp}" != "no")
 448
 449 AC_MSG_CHECKING(which DNS backend to use)
 450 AC_ARG_WITH(dns-backend, AC_HELP_STRING([--with-dns-backend=TYPE],
 451             [specify which DNS backend to use: internal or systemd-resolved [default=internal]]),
 452                 [dns_backend=${withval}],
 453                 [dns_backend="internal"])
 454
 455 if (test "${dns_backend}" != "internal" -a \
 456                 "${dns_backend}" != "systemd-resolved"); then
 457         AC_MSG_ERROR(no suitable DNS backend defined)
 458 fi
 459 AM_CONDITIONAL(INTERNAL_DNS_BACKEND, test "${dns_backend}" = "internal")
 460 AM_CONDITIONAL(SYSTEMD_RESOLVED_DNS_BACKEND, test "${dns_backend}" = "systemd-resolved")
 461 AC_MSG_RESULT(${dns_backend})
 462
 463 AC_OUTPUT(Makefile include/version.h connman.pc)