ares/configure.ac - third_party/curl - Git at Google


 dnl Process this file with autoconf to produce a configure script.
 AC_PREREQ(2.57)
 AC_INIT(ares_init.c)
 AC_CONFIG_SRCDIR([ares_ipv6.h])
 AM_CONFIG_HEADER(config.h)
 AM_MAINTAINER_MODE
 AM_INIT_AUTOMAKE(c-ares, CVS)

 AC_PROG_CC
 AC_PROG_INSTALL

 case $host_os in
 solaris*)
 	AC_DEFINE(ETC_INET, 1, [if a /etc/inet dir is being used])
 	;;
 esac

 AC_LIBTOOL_WIN32_DLL

 dnl ************************************************************
 dnl Option to switch on debug options. This makes an assumption that
 dnl this is built as an 'ares' subdir in the curl source tree. Subject for
 dnl improval in the future!
 dnl
 AC_MSG_CHECKING([whether to enable debug options])
 AC_ARG_ENABLE(debug,
 AC_HELP_STRING([--enable-debug],[Enable pedantic debug options])
 AC_HELP_STRING([--disable-debug],[Disable debug options]),
 [ case "$enableval" in
   no)
        AC_MSG_RESULT(no)
        ;;
   *)   AC_MSG_RESULT(yes)

     dnl when doing the debug stuff, use static library only
     AC_DISABLE_SHARED

     dnl the entire --enable-debug is a hack that lives and runs on top of
     dnl libcurl stuff so this BUILDING_LIBCURL is not THAT much uglier
     AC_DEFINE(BUILDING_LIBCURL, 1, [when building as static part of libcurl])

     CPPFLAGS="$CPPFLAGS -DCURLDEBUG -I$srcdir/../include"
     CFLAGS="$CFLAGS -g"

     dnl check for how to do large files, needed to get the curl_off_t check
     dnl done right
     AC_SYS_LARGEFILE

     AC_CHECK_SIZEOF(curl_off_t, ,[
 #include <stdio.h>
 #include "$srcdir/../include/curl/curl.h"
     ])

     dnl set compiler "debug" options to become more picky, and remove
     dnl optimize options from CFLAGS
     CURL_CC_DEBUG_OPTS

        ;;
   esac ],
        AC_MSG_RESULT(no)
 )

 dnl libtool setup
 CARES_CLEAR_LIBTOOL_TAGS
 AC_PROG_LIBTOOL

 AC_MSG_CHECKING([if we need -no-undefined])
 case $host in
   *-*-cygwin | *-*-mingw* | *-*-pw32*)
     need_no_undefined=yes
     ;;
   *)
     need_no_undefined=no
     ;;
 esac
 AC_MSG_RESULT($need_no_undefined)
 AM_CONDITIONAL(NO_UNDEFINED, test x$need_no_undefined = xyes)

 dnl **********************************************************************
 dnl Checks for libraries.
 dnl **********************************************************************

 dnl gethostbyname without lib or in the nsl lib?
 AC_CHECK_FUNC(gethostbyname,
               [HAVE_GETHOSTBYNAME="1"
               ],
               [ AC_CHECK_LIB(nsl, gethostbyname,
                              [HAVE_GETHOSTBYNAME="1"
                              LIBS="$LIBS -lnsl"
                              ])
               ])

 if test "$HAVE_GETHOSTBYNAME" != "1"
 then
   dnl gethostbyname in the socket lib?
   AC_CHECK_LIB(socket, gethostbyname,
                [HAVE_GETHOSTBYNAME="1"
                LIBS="$LIBS -lsocket"
                ])
 fi

 dnl At least one system has been identified to require BOTH nsl and socket
 dnl libs at the same time to link properly.
 if test "$HAVE_GETHOSTBYNAME" != "1"
 then
   AC_MSG_CHECKING([for gethostbyname with both nsl and socket libs])
   my_ac_save_LIBS=$LIBS
   LIBS="-lnsl -lsocket $LIBS"
   AC_TRY_LINK( ,
              [gethostbyname();],
              [ dnl found it!
              HAVE_GETHOSTBYNAME="1"
              AC_MSG_RESULT([yes])],
              [ dnl failed!
              AC_MSG_RESULT([no])
              dnl restore LIBS
              LIBS=$my_ac_save_LIBS]
              )
 fi

 if test "$HAVE_GETHOSTBYNAME" != "1"
 then
   dnl This is for Msys/Mingw
   AC_MSG_CHECKING([for gethostbyname in ws2_32])
   my_ac_save_LIBS=$LIBS
   LIBS="-lws2_32 $LIBS"
   AC_TRY_LINK([#include <winsock2.h>],
                [gethostbyname("www.dummysite.com");],
                [ dnl worked!
                ws2="yes"
                AC_MSG_RESULT([yes])
                HAVE_GETHOSTBYNAME="1"],
                [ dnl failed, restore LIBS
                LIBS=$my_ac_save_LIBS
                AC_MSG_RESULT(no)]
              )
 fi

 if test "$HAVE_GETHOSTBYNAME" != "1"
 then
   dnl This is for eCos with a stubbed DNS implementation
   AC_MSG_CHECKING([for gethostbyname for eCos])
   AC_TRY_LINK([
 #include <stdio.h>
 #include <netdb.h>],
                [gethostbyname("www.dummysite.com");],
                [ dnl worked!
                AC_MSG_RESULT([yes])
                HAVE_GETHOSTBYNAME="1"],
                AC_MSG_RESULT(no)
              )
 fi

 if test "$HAVE_GETHOSTBYNAME" != "1"
 then
   dnl gethostbyname in the net lib - for BeOS
   AC_CHECK_LIB(net, gethostbyname,
                [HAVE_GETHOSTBYNAME="1"
                LIBS="$LIBS -lnet"
                ])
 fi


 if test "$HAVE_GETHOSTBYNAME" = "1"; then
   AC_DEFINE(HAVE_GETHOSTBYNAME, 1, [If you have gethostbyname])
 else
   AC_MSG_ERROR([couldn't find libraries for gethostbyname()])
 fi

 dnl resolve lib?
 AC_CHECK_FUNC(strcasecmp, , [ AC_CHECK_LIB(resolve, strcasecmp) ])

 if test "$ac_cv_lib_resolve_strcasecmp" = "$ac_cv_func_strcasecmp"; then
   AC_CHECK_LIB(resolve, strcasecmp,
               [LIBS="-lresolve $LIBS"],
                ,
                -lnsl)
 fi

 dnl socket lib?
 AC_CHECK_FUNC(connect, , [ AC_CHECK_LIB(socket, connect) ])

 dnl dl lib?
 AC_CHECK_FUNC(dlclose, , [ AC_CHECK_LIB(dl, dlopen) ])

 AC_MSG_CHECKING([whether to use libgcc])
 AC_ARG_ENABLE(libgcc,
 AC_HELP_STRING([--enable-libgcc],[use libgcc when linking]),
 [ case "$enableval" in
   yes)
         LIBS="$LIBS -lgcc"
        AC_MSG_RESULT(yes)
        ;;
   *)   AC_MSG_RESULT(no)
        ;;
   esac ],
        AC_MSG_RESULT(no)
 )

 dnl **********************************************************************
 dnl Back to "normal" configuring
 dnl **********************************************************************

 dnl Checks for header files.
 AC_HEADER_STDC

 dnl **********************************************************************
 dnl Make sure that our checks for headers windows.h winsock.h winsock2.h
 dnl and ws2tcpip.h take precedence over any other further checks which
 dnl could be done later using AC_CHECK_HEADER or AC_CHECK_HEADERS for
 dnl this specific header files. And do them before its results are used.
 dnl **********************************************************************

 CURL_CHECK_HEADER_WINDOWS
 CURL_CHECK_HEADER_WINSOCK
 CURL_CHECK_HEADER_WINSOCK2
 CURL_CHECK_HEADER_WS2TCPIP

 CURL_CHECK_HEADER_MALLOC

 dnl check for a few basic system headers we need
 AC_CHECK_HEADERS(
        sys/types.h \
        sys/time.h \
        sys/select.h \
        sys/socket.h \
        sys/ioctl.h \
        netdb.h \
        netinet/in.h \
        net/if.h \
        arpa/nameser.h \
        arpa/nameser_compat.h \
        arpa/inet.h,
 dnl to do if not found
 [],
 dnl to do if found
 [],
 dnl default includes
 [
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
 #endif
 dnl We do this default-include simply to make sure that the nameser_compat.h
 dnl header *REALLY* can be include after the new nameser.h. It seems AIX 5.1
 dnl (and others?) is not designed to allow this.
 #ifdef HAVE_ARPA_NAMESER_H
 #include <arpa/nameser.h>
 #endif

 dnl *Sigh* these are needed in order for net/if.h to get properly detected.
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 ]
 )

 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_TYPE_SIZE_T
 AC_HEADER_TIME

 AC_CHECK_SIZEOF(size_t)
 AC_CHECK_SIZEOF(long)
 AC_CHECK_SIZEOF(time_t)

 AC_CHECK_TYPE(long long,
    [AC_DEFINE(HAVE_LONGLONG, 1, [if your compiler supports long long])]
    longlong="yes"
 )

 if test "xyes" = "x$longlong"; then
   AC_MSG_CHECKING([if numberLL works])
   AC_COMPILE_IFELSE([long long val = 1000LL;],
    [AC_DEFINE(HAVE_LL, 1, [if your compiler supports LL])]
    AC_MSG_RESULT(yes),
    AC_MSG_RESULT(no)
   )
 fi


 # check for ssize_t
 AC_CHECK_TYPE(ssize_t, ,
    AC_DEFINE(ssize_t, int, [the signed version of size_t]))

 # Check for socklen_t or equivalent
 CURL_CHECK_TYPE_SOCKLEN_T

 TYPE_IN_ADDR_T

 TYPE_SOCKADDR_STORAGE

 CURL_CHECK_FUNC_RECV

 CURL_CHECK_FUNC_SEND

 CURL_CHECK_MSG_NOSIGNAL

 dnl check for AF_INET6
 CARES_CHECK_CONSTANT(
   [
 #undef inline
 #ifdef HAVE_WINDOWS_H
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
 #ifdef HAVE_WINSOCK2_H
 #include <winsock2.h>
 #endif
 #else
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #endif
   ], [PF_INET6],
      AC_DEFINE_UNQUOTED(HAVE_PF_INET6,1,[Define to 1 if you have PF_INET6.])
 )

 dnl check for PF_INET6
 CARES_CHECK_CONSTANT(
   [
 #undef inline
 #ifdef HAVE_WINDOWS_H
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
 #ifdef HAVE_WINSOCK2_H
 #include <winsock2.h>
 #endif
 #else
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #endif
   ], [AF_INET6],
      AC_DEFINE_UNQUOTED(HAVE_AF_INET6,1,[Define to 1 if you have AF_INET6.])
 )


 dnl check for the in6_addr structure
 CARES_CHECK_STRUCT(
   [
 #undef inline
 #ifdef HAVE_WINDOWS_H
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
 #ifdef HAVE_WINSOCK2_H
 #include <winsock2.h>
 #ifdef HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
 #endif
 #endif
 #else
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 #endif
   ], [in6_addr],
      AC_DEFINE_UNQUOTED(HAVE_STRUCT_IN6_ADDR,1,[Define to 1 if you have struct in6_addr.])
 )

 dnl check for the sockaddr_in6 structure
 CARES_CHECK_STRUCT(
   [
 #undef inline
 #ifdef HAVE_WINDOWS_H
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
 #ifdef HAVE_WINSOCK2_H
 #include <winsock2.h>
 #ifdef HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
 #endif
 #endif
 #else
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 #endif
   ], [sockaddr_in6],
      AC_DEFINE_UNQUOTED(HAVE_STRUCT_SOCKADDR_IN6,1,
        [Define to 1 if you have struct sockaddr_in6.]) ac_have_sockaddr_in6=yes
 )

 AC_CHECK_MEMBER(struct sockaddr_in6.sin6_scope_id,
     AC_DEFINE_UNQUOTED(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID,1,
       [Define to 1 if your struct sockaddr_in6 has sin6_scope_id.])
    , ,
   [
 #undef inline
 #ifdef HAVE_WINDOWS_H
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
 #ifdef HAVE_WINSOCK2_H
 #include <winsock2.h>
 #ifdef HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
 #endif
 #endif
 #else
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 #endif
   ])

 dnl check for the addrinfo structure
 AC_CHECK_MEMBER(struct addrinfo.ai_flags,
      AC_DEFINE_UNQUOTED(HAVE_STRUCT_ADDRINFO,1,
        [Define to 1 if you have struct addrinfo.]),,
   [
 #undef inline
 #ifdef HAVE_WINDOWS_H
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
 #ifdef HAVE_WINSOCK2_H
 #include <winsock2.h>
 #ifdef HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
 #endif
 #endif
 #else
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #ifdef HAVE_NETDB_H
 #include <netdb.h>
 #endif
 #endif
   ]
 )


 AC_CHECK_FUNCS( bitncmp \
                 if_indextoname,
 dnl if found
 [],
 dnl if not found, $ac_func is the name we check for
 func="$ac_func"
 AC_MSG_CHECKING([deeper for $func])
 AC_TRY_LINK( [],
              [ $func ();],
              AC_MSG_RESULT(yes!)
              eval "ac_cv_func_$func=yes"
              def=`echo "HAVE_$func" | tr 'a-z' 'A-Z'`
              AC_DEFINE_UNQUOTED($def, 1, [If you have $func]),
              AC_MSG_RESULT(but still no)
              )
 )


 dnl check for inet_pton
 AC_CHECK_FUNCS(inet_pton)
 dnl Some systems have it, but not IPv6
 if test "$ac_cv_func_inet_pton" = "yes" ; then
 AC_MSG_CHECKING(if inet_pton supports IPv6)
 AC_TRY_RUN(
   [
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 int main()
   {
     struct in6_addr addr6;
     if (inet_pton(AF_INET6, "::1", &addr6) < 1)
       exit(1);
     else
       exit(0);
   }
   ], [
        AC_MSG_RESULT(yes)
        AC_DEFINE_UNQUOTED(HAVE_INET_PTON_IPV6,1,[Define to 1 if inet_pton supports IPv6.])
      ], AC_MSG_RESULT(no),AC_MSG_RESULT(no))
 fi
 dnl Check for inet_net_pton
 AC_CHECK_FUNCS(inet_net_pton)
 dnl Again, some systems have it, but not IPv6
 if test "$ac_cv_func_inet_net_pton" = "yes" ; then
 AC_MSG_CHECKING(if inet_net_pton supports IPv6)
 AC_TRY_RUN(
   [
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 int main()
   {
     struct in6_addr addr6;
     if (inet_net_pton(AF_INET6, "::1", &addr6, sizeof(addr6)) < 1)
       exit(1);
     else
       exit(0);
   }
   ], [
        AC_MSG_RESULT(yes)
        AC_DEFINE_UNQUOTED(HAVE_INET_NET_PTON_IPV6,1,[Define to 1 if inet_net_pton supports IPv6.])
      ], AC_MSG_RESULT(no),AC_MSG_RESULT(no))
 fi


 dnl Check for inet_ntop
 AC_CHECK_FUNCS(inet_ntop)
 dnl Again, some systems have it, but not IPv6
 if test "$ac_cv_func_inet_ntop" = "yes" ; then
 AC_MSG_CHECKING(if inet_ntop supports IPv6)
 AC_TRY_RUN(
   [
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 #include <errno.h>
 int main()
   {
     struct in6_addr addr6;
     char buf[128];
     if (inet_ntop(AF_INET6, &addr6, buf, 128) == 0 && errno == EAFNOSUPPORT)
       exit(1);
     else
       exit(0);
   }
   ], [
        AC_MSG_RESULT(yes)
        AC_DEFINE_UNQUOTED(HAVE_INET_NTOP_IPV6,1,
           [Define to 1 if inet_ntop supports IPv6.])
      ], AC_MSG_RESULT(no),AC_MSG_RESULT(no))
 fi

 AC_CHECK_SIZEOF(struct in6_addr, ,
 [
 #undef inline
 #ifdef HAVE_WINDOWS_H
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
 #ifdef HAVE_WINSOCK2_H
 #include <winsock2.h>
 #ifdef HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
 #endif
 #endif
 #else
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 #endif
 ]
 )

 AC_CHECK_SIZEOF(struct in_addr, ,
 [
 #undef inline
 #ifdef HAVE_WINDOWS_H
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
 #ifdef HAVE_WINSOCK2_H
 #include <winsock2.h>
 #ifdef HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
 #endif
 #endif
 #else
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 #endif
 ]
 )


 dnl Check if the getnameinfo function is available
 dnl and get the types of five of its arguments.
 CURL_CHECK_FUNC_GETNAMEINFO


 dnl God bless non-standardized functions! We need to see which getservbyport_r
 dnl variant is available
 CARES_CHECK_GETSERVBYPORT_R

 CURL_CHECK_NONBLOCKING_SOCKET

 AC_C_BIGENDIAN(
     [AC_DEFINE(ARES_BIG_ENDIAN, 1,
       [define this if ares is built for a big endian system])],
     ,
     [AC_MSG_WARN([couldn't figure out endianess, assuming little endian!])]
 )

 AC_OUTPUT(Makefile)

	dnl Process this file with autoconf to produce a configure script.
	AC_PREREQ(2.57)
	AC_INIT(ares_init.c)
	AC_CONFIG_SRCDIR([ares_ipv6.h])
	AM_CONFIG_HEADER(config.h)
	AM_MAINTAINER_MODE
	AM_INIT_AUTOMAKE(c-ares, CVS)

	AC_PROG_CC
	AC_PROG_INSTALL

	case $host_os in
	solaris*)
	AC_DEFINE(ETC_INET, 1, [if a /etc/inet dir is being used])
	;;
	esac

	AC_LIBTOOL_WIN32_DLL

	dnl ************************************************************
	dnl Option to switch on debug options. This makes an assumption that
	dnl this is built as an 'ares' subdir in the curl source tree. Subject for
	dnl improval in the future!
	dnl
	AC_MSG_CHECKING([whether to enable debug options])
	AC_ARG_ENABLE(debug,
	AC_HELP_STRING([--enable-debug],[Enable pedantic debug options])
	AC_HELP_STRING([--disable-debug],[Disable debug options]),
	[ case "$enableval" in
	no)
	AC_MSG_RESULT(no)
	;;
	*) AC_MSG_RESULT(yes)

	dnl when doing the debug stuff, use static library only
	AC_DISABLE_SHARED

	dnl the entire --enable-debug is a hack that lives and runs on top of
	dnl libcurl stuff so this BUILDING_LIBCURL is not THAT much uglier
	AC_DEFINE(BUILDING_LIBCURL, 1, [when building as static part of libcurl])

	CPPFLAGS="$CPPFLAGS -DCURLDEBUG -I$srcdir/../include"
	CFLAGS="$CFLAGS -g"

	dnl check for how to do large files, needed to get the curl_off_t check
	dnl done right
	AC_SYS_LARGEFILE

	AC_CHECK_SIZEOF(curl_off_t, ,[
	#include <stdio.h>
	#include "$srcdir/../include/curl/curl.h"
	])

	dnl set compiler "debug" options to become more picky, and remove
	dnl optimize options from CFLAGS
	CURL_CC_DEBUG_OPTS

	;;
	esac ],
	AC_MSG_RESULT(no)
	)

	dnl libtool setup
	CARES_CLEAR_LIBTOOL_TAGS
	AC_PROG_LIBTOOL

	AC_MSG_CHECKING([if we need -no-undefined])
	case $host in
	--cygwin \| --mingw* \| --pw32*)
	need_no_undefined=yes
	;;
	*)
	need_no_undefined=no
	;;
	esac
	AC_MSG_RESULT($need_no_undefined)
	AM_CONDITIONAL(NO_UNDEFINED, test x$need_no_undefined = xyes)

	dnl **********************************************************************
	dnl Checks for libraries.
	dnl **********************************************************************

	dnl gethostbyname without lib or in the nsl lib?
	AC_CHECK_FUNC(gethostbyname,
	[HAVE_GETHOSTBYNAME="1"
	],
	[ AC_CHECK_LIB(nsl, gethostbyname,
	[HAVE_GETHOSTBYNAME="1"
	LIBS="$LIBS -lnsl"
	])
	])

	if test "$HAVE_GETHOSTBYNAME" != "1"
	then
	dnl gethostbyname in the socket lib?
	AC_CHECK_LIB(socket, gethostbyname,
	[HAVE_GETHOSTBYNAME="1"
	LIBS="$LIBS -lsocket"
	])
	fi

	dnl At least one system has been identified to require BOTH nsl and socket
	dnl libs at the same time to link properly.
	if test "$HAVE_GETHOSTBYNAME" != "1"
	then
	AC_MSG_CHECKING([for gethostbyname with both nsl and socket libs])
	my_ac_save_LIBS=$LIBS
	LIBS="-lnsl -lsocket $LIBS"
	AC_TRY_LINK( ,
	[gethostbyname();],
	[ dnl found it!
	HAVE_GETHOSTBYNAME="1"
	AC_MSG_RESULT([yes])],
	[ dnl failed!
	AC_MSG_RESULT([no])
	dnl restore LIBS
	LIBS=$my_ac_save_LIBS]
	)
	fi

	if test "$HAVE_GETHOSTBYNAME" != "1"
	then
	dnl This is for Msys/Mingw
	AC_MSG_CHECKING([for gethostbyname in ws2_32])
	my_ac_save_LIBS=$LIBS
	LIBS="-lws2_32 $LIBS"
	AC_TRY_LINK([#include <winsock2.h>],
	[gethostbyname("www.dummysite.com");],
	[ dnl worked!
	ws2="yes"
	AC_MSG_RESULT([yes])
	HAVE_GETHOSTBYNAME="1"],
	[ dnl failed, restore LIBS
	LIBS=$my_ac_save_LIBS
	AC_MSG_RESULT(no)]
	)
	fi

	if test "$HAVE_GETHOSTBYNAME" != "1"
	then
	dnl This is for eCos with a stubbed DNS implementation
	AC_MSG_CHECKING([for gethostbyname for eCos])
	AC_TRY_LINK([
	#include <stdio.h>
	#include <netdb.h>],
	[gethostbyname("www.dummysite.com");],
	[ dnl worked!
	AC_MSG_RESULT([yes])
	HAVE_GETHOSTBYNAME="1"],
	AC_MSG_RESULT(no)
	)
	fi

	if test "$HAVE_GETHOSTBYNAME" != "1"
	then
	dnl gethostbyname in the net lib - for BeOS
	AC_CHECK_LIB(net, gethostbyname,
	[HAVE_GETHOSTBYNAME="1"
	LIBS="$LIBS -lnet"
	])
	fi


	if test "$HAVE_GETHOSTBYNAME" = "1"; then
	AC_DEFINE(HAVE_GETHOSTBYNAME, 1, [If you have gethostbyname])
	else
	AC_MSG_ERROR([couldn't find libraries for gethostbyname()])
	fi

	dnl resolve lib?
	AC_CHECK_FUNC(strcasecmp, , [ AC_CHECK_LIB(resolve, strcasecmp) ])

	if test "$ac_cv_lib_resolve_strcasecmp" = "$ac_cv_func_strcasecmp"; then
	AC_CHECK_LIB(resolve, strcasecmp,
	[LIBS="-lresolve $LIBS"],
	,
	-lnsl)
	fi

	dnl socket lib?
	AC_CHECK_FUNC(connect, , [ AC_CHECK_LIB(socket, connect) ])

	dnl dl lib?
	AC_CHECK_FUNC(dlclose, , [ AC_CHECK_LIB(dl, dlopen) ])

	AC_MSG_CHECKING([whether to use libgcc])
	AC_ARG_ENABLE(libgcc,
	AC_HELP_STRING([--enable-libgcc],[use libgcc when linking]),
	[ case "$enableval" in
	yes)
	LIBS="$LIBS -lgcc"
	AC_MSG_RESULT(yes)
	;;
	*) AC_MSG_RESULT(no)
	;;
	esac ],
	AC_MSG_RESULT(no)
	)

	dnl **********************************************************************
	dnl Back to "normal" configuring
	dnl **********************************************************************

	dnl Checks for header files.
	AC_HEADER_STDC

	dnl **********************************************************************
	dnl Make sure that our checks for headers windows.h winsock.h winsock2.h
	dnl and ws2tcpip.h take precedence over any other further checks which
	dnl could be done later using AC_CHECK_HEADER or AC_CHECK_HEADERS for
	dnl this specific header files. And do them before its results are used.
	dnl **********************************************************************

	CURL_CHECK_HEADER_WINDOWS
	CURL_CHECK_HEADER_WINSOCK
	CURL_CHECK_HEADER_WINSOCK2
	CURL_CHECK_HEADER_WS2TCPIP

	CURL_CHECK_HEADER_MALLOC

	dnl check for a few basic system headers we need
	AC_CHECK_HEADERS(
	sys/types.h \
	sys/time.h \
	sys/select.h \
	sys/socket.h \
	sys/ioctl.h \
	netdb.h \
	netinet/in.h \
	net/if.h \
	arpa/nameser.h \
	arpa/nameser_compat.h \
	arpa/inet.h,
	dnl to do if not found
	[],
	dnl to do if found
	[],
	dnl default includes
	[
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_TIME_H
	#include <sys/time.h>
	#endif
	dnl We do this default-include simply to make sure that the nameser_compat.h
	dnl header REALLY can be include after the new nameser.h. It seems AIX 5.1
	dnl (and others?) is not designed to allow this.
	#ifdef HAVE_ARPA_NAMESER_H
	#include <arpa/nameser.h>
	#endif

	dnl Sigh these are needed in order for net/if.h to get properly detected.
	#ifdef HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif
	#ifdef HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	]
	)

	dnl Checks for typedefs, structures, and compiler characteristics.
	AC_C_CONST
	AC_TYPE_SIZE_T
	AC_HEADER_TIME

	AC_CHECK_SIZEOF(size_t)
	AC_CHECK_SIZEOF(long)
	AC_CHECK_SIZEOF(time_t)

	AC_CHECK_TYPE(long long,
	[AC_DEFINE(HAVE_LONGLONG, 1, [if your compiler supports long long])]
	longlong="yes"
	)

	if test "xyes" = "x$longlong"; then
	AC_MSG_CHECKING([if numberLL works])
	AC_COMPILE_IFELSE([long long val = 1000LL;],
	[AC_DEFINE(HAVE_LL, 1, [if your compiler supports LL])]
	AC_MSG_RESULT(yes),
	AC_MSG_RESULT(no)
	)
	fi


	# check for ssize_t
	AC_CHECK_TYPE(ssize_t, ,
	AC_DEFINE(ssize_t, int, [the signed version of size_t]))

	# Check for socklen_t or equivalent
	CURL_CHECK_TYPE_SOCKLEN_T

	TYPE_IN_ADDR_T

	TYPE_SOCKADDR_STORAGE

	CURL_CHECK_FUNC_RECV

	CURL_CHECK_FUNC_SEND

	CURL_CHECK_MSG_NOSIGNAL

	dnl check for AF_INET6
	CARES_CHECK_CONSTANT(
	[
	#undef inline
	#ifdef HAVE_WINDOWS_H
	#ifndef WIN32_LEAN_AND_MEAN
	#define WIN32_LEAN_AND_MEAN
	#endif
	#include <windows.h>
	#ifdef HAVE_WINSOCK2_H
	#include <winsock2.h>
	#endif
	#else
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif
	#endif
	], [PF_INET6],
	AC_DEFINE_UNQUOTED(HAVE_PF_INET6,1,[Define to 1 if you have PF_INET6.])
	)

	dnl check for PF_INET6
	CARES_CHECK_CONSTANT(
	[
	#undef inline
	#ifdef HAVE_WINDOWS_H
	#ifndef WIN32_LEAN_AND_MEAN
	#define WIN32_LEAN_AND_MEAN
	#endif
	#include <windows.h>
	#ifdef HAVE_WINSOCK2_H
	#include <winsock2.h>
	#endif
	#else
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif
	#endif
	], [AF_INET6],
	AC_DEFINE_UNQUOTED(HAVE_AF_INET6,1,[Define to 1 if you have AF_INET6.])
	)


	dnl check for the in6_addr structure
	CARES_CHECK_STRUCT(
	[
	#undef inline
	#ifdef HAVE_WINDOWS_H
	#ifndef WIN32_LEAN_AND_MEAN
	#define WIN32_LEAN_AND_MEAN
	#endif
	#include <windows.h>
	#ifdef HAVE_WINSOCK2_H
	#include <winsock2.h>
	#ifdef HAVE_WS2TCPIP_H
	#include <ws2tcpip.h>
	#endif
	#endif
	#else
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	#endif
	], [in6_addr],
	AC_DEFINE_UNQUOTED(HAVE_STRUCT_IN6_ADDR,1,[Define to 1 if you have struct in6_addr.])
	)

	dnl check for the sockaddr_in6 structure
	CARES_CHECK_STRUCT(
	[
	#undef inline
	#ifdef HAVE_WINDOWS_H
	#ifndef WIN32_LEAN_AND_MEAN
	#define WIN32_LEAN_AND_MEAN
	#endif
	#include <windows.h>
	#ifdef HAVE_WINSOCK2_H
	#include <winsock2.h>
	#ifdef HAVE_WS2TCPIP_H
	#include <ws2tcpip.h>
	#endif
	#endif
	#else
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	#endif
	], [sockaddr_in6],
	AC_DEFINE_UNQUOTED(HAVE_STRUCT_SOCKADDR_IN6,1,
	[Define to 1 if you have struct sockaddr_in6.]) ac_have_sockaddr_in6=yes
	)

	AC_CHECK_MEMBER(struct sockaddr_in6.sin6_scope_id,
	AC_DEFINE_UNQUOTED(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID,1,
	[Define to 1 if your struct sockaddr_in6 has sin6_scope_id.])
	, ,
	[
	#undef inline
	#ifdef HAVE_WINDOWS_H
	#ifndef WIN32_LEAN_AND_MEAN
	#define WIN32_LEAN_AND_MEAN
	#endif
	#include <windows.h>
	#ifdef HAVE_WINSOCK2_H
	#include <winsock2.h>
	#ifdef HAVE_WS2TCPIP_H
	#include <ws2tcpip.h>
	#endif
	#endif
	#else
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	#endif
	])

	dnl check for the addrinfo structure
	AC_CHECK_MEMBER(struct addrinfo.ai_flags,
	AC_DEFINE_UNQUOTED(HAVE_STRUCT_ADDRINFO,1,
	[Define to 1 if you have struct addrinfo.]),,
	[
	#undef inline
	#ifdef HAVE_WINDOWS_H
	#ifndef WIN32_LEAN_AND_MEAN
	#define WIN32_LEAN_AND_MEAN
	#endif
	#include <windows.h>
	#ifdef HAVE_WINSOCK2_H
	#include <winsock2.h>
	#ifdef HAVE_WS2TCPIP_H
	#include <ws2tcpip.h>
	#endif
	#endif
	#else
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif
	#ifdef HAVE_NETDB_H
	#include <netdb.h>
	#endif
	#endif
	]
	)


	AC_CHECK_FUNCS( bitncmp \
	if_indextoname,
	dnl if found
	[],
	dnl if not found, $ac_func is the name we check for
	func="$ac_func"
	AC_MSG_CHECKING([deeper for $func])
	AC_TRY_LINK( [],
	[ $func ();],
	AC_MSG_RESULT(yes!)
	eval "ac_cv_func_$func=yes"
	def=`echo "HAVE_$func" \| tr 'a-z' 'A-Z'`
	AC_DEFINE_UNQUOTED($def, 1, [If you have $func]),
	AC_MSG_RESULT(but still no)
	)
	)


	dnl check for inet_pton
	AC_CHECK_FUNCS(inet_pton)
	dnl Some systems have it, but not IPv6
	if test "$ac_cv_func_inet_pton" = "yes" ; then
	AC_MSG_CHECKING(if inet_pton supports IPv6)
	AC_TRY_RUN(
	[
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif
	#ifdef HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	int main()
	{
	struct in6_addr addr6;
	if (inet_pton(AF_INET6, "::1", &addr6) < 1)
	exit(1);
	else
	exit(0);
	}
	], [
	AC_MSG_RESULT(yes)
	AC_DEFINE_UNQUOTED(HAVE_INET_PTON_IPV6,1,[Define to 1 if inet_pton supports IPv6.])
	], AC_MSG_RESULT(no),AC_MSG_RESULT(no))
	fi
	dnl Check for inet_net_pton
	AC_CHECK_FUNCS(inet_net_pton)
	dnl Again, some systems have it, but not IPv6
	if test "$ac_cv_func_inet_net_pton" = "yes" ; then
	AC_MSG_CHECKING(if inet_net_pton supports IPv6)
	AC_TRY_RUN(
	[
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif
	#ifdef HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	int main()
	{
	struct in6_addr addr6;
	if (inet_net_pton(AF_INET6, "::1", &addr6, sizeof(addr6)) < 1)
	exit(1);
	else
	exit(0);
	}
	], [
	AC_MSG_RESULT(yes)
	AC_DEFINE_UNQUOTED(HAVE_INET_NET_PTON_IPV6,1,[Define to 1 if inet_net_pton supports IPv6.])
	], AC_MSG_RESULT(no),AC_MSG_RESULT(no))
	fi


	dnl Check for inet_ntop
	AC_CHECK_FUNCS(inet_ntop)
	dnl Again, some systems have it, but not IPv6
	if test "$ac_cv_func_inet_ntop" = "yes" ; then
	AC_MSG_CHECKING(if inet_ntop supports IPv6)
	AC_TRY_RUN(
	[
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif
	#ifdef HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	#include <errno.h>
	int main()
	{
	struct in6_addr addr6;
	char buf[128];
	if (inet_ntop(AF_INET6, &addr6, buf, 128) == 0 && errno == EAFNOSUPPORT)
	exit(1);
	else
	exit(0);
	}
	], [
	AC_MSG_RESULT(yes)
	AC_DEFINE_UNQUOTED(HAVE_INET_NTOP_IPV6,1,
	[Define to 1 if inet_ntop supports IPv6.])
	], AC_MSG_RESULT(no),AC_MSG_RESULT(no))
	fi

	AC_CHECK_SIZEOF(struct in6_addr, ,
	[
	#undef inline
	#ifdef HAVE_WINDOWS_H
	#ifndef WIN32_LEAN_AND_MEAN
	#define WIN32_LEAN_AND_MEAN
	#endif
	#include <windows.h>
	#ifdef HAVE_WINSOCK2_H
	#include <winsock2.h>
	#ifdef HAVE_WS2TCPIP_H
	#include <ws2tcpip.h>
	#endif
	#endif
	#else
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif
	#ifdef HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	#endif
	]
	)

	AC_CHECK_SIZEOF(struct in_addr, ,
	[
	#undef inline
	#ifdef HAVE_WINDOWS_H
	#ifndef WIN32_LEAN_AND_MEAN
	#define WIN32_LEAN_AND_MEAN
	#endif
	#include <windows.h>
	#ifdef HAVE_WINSOCK2_H
	#include <winsock2.h>
	#ifdef HAVE_WS2TCPIP_H
	#include <ws2tcpip.h>
	#endif
	#endif
	#else
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif
	#ifdef HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	#endif
	]
	)


	dnl Check if the getnameinfo function is available
	dnl and get the types of five of its arguments.
	CURL_CHECK_FUNC_GETNAMEINFO


	dnl God bless non-standardized functions! We need to see which getservbyport_r
	dnl variant is available
	CARES_CHECK_GETSERVBYPORT_R

	CURL_CHECK_NONBLOCKING_SOCKET

	AC_C_BIGENDIAN(
	[AC_DEFINE(ARES_BIG_ENDIAN, 1,
	[define this if ares is built for a big endian system])],
	,
	[AC_MSG_WARN([couldn't figure out endianess, assuming little endian!])]
	)

	AC_OUTPUT(Makefile)