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  • #***************************************************************************
    #                                  _   _ ____  _
    #  Project                     ___| | | |  _ \| |
    #                             / __| | | | |_) | |
    #                            | (__| |_| |  _ <| |___
    #                             \___|\___/|_| \_\_____|
    #
    # Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
    #
    # This software is licensed as described in the file COPYING, which
    # you should have received as part of this distribution. The terms
    # are also available at http://curl.haxx.se/docs/copyright.html.
    #
    # You may opt to use, copy, modify, merge, publish, distribute and/or sell
    # copies of the Software, and permit persons to whom the Software is
    # furnished to do so, under the terms of the COPYING file.
    #
    # This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
    # KIND, either express or implied.
    #
    # $Id$
    #***************************************************************************
    
    # File version for 'aclocal' use. Keep it a single number.
    
    
    
    dnl CURL_INCLUDES_ARPA_INET
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when arpa/inet.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_ARPA_INET], [
    curl_includes_arpa_inet="\
    /* includes start */
    #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
    #ifdef HAVE_ARPA_INET_H
    #  include <arpa_inet.h>
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h sys/socket.h netinet/in.h arpa/inet.h,
        [], [], [$curl_includes_arpa_inet])
    ])
    
    dnl CURL_INCLUDES_IFADDRS
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when ifaddrs.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_IFADDRS], [
    curl_includes_ifaddrs="\
    /* includes start */
    #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
    #ifdef HAVE_IFADDRS_H
    #  include <ifaddrs.h>
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h sys/socket.h netinet/in.h ifaddrs.h,
        [], [], [$curl_includes_ifaddrs])
    ])
    
    
    
    dnl CURL_INCLUDES_NETDB
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when netdb.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_NETDB], [
    curl_includes_netdb="\
    /* includes start */
    #ifdef HAVE_SYS_TYPES_H
    #  include <sys/types.h>
    #endif
    #ifdef HAVE_NETDB_H
    #  include <netdb.h>
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h netdb.h,
        [], [], [$curl_includes_netdb])
    ])
    
    dnl CURL_INCLUDES_SETJMP
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when setjmp.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_SETJMP], [
    curl_includes_setjmp="\
    /* includes start */
    #ifdef HAVE_SYS_TYPES_H
    #  include <sys/types.h>
    #endif
    #ifdef HAVE_SETJMP_H
    #  include <setjmp.h>
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h setjmp.h,
        [], [], [$curl_includes_setjmp])
    ])
    
    
    
    dnl CURL_INCLUDES_SIGNAL
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when signal.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_SIGNAL], [
    curl_includes_signal="\
    /* includes start */
    #ifdef HAVE_SYS_TYPES_H
    #  include <sys/types.h>
    #endif
    #ifdef HAVE_SIGNAL_H
    #  include <signal.h>
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h signal.h,
        [], [], [$curl_includes_signal])
    ])
    
    
    
    dnl CURL_INCLUDES_STDIO
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when stdio.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_STDIO], [
    curl_includes_stdio="\
    /* includes start */
    #ifdef HAVE_SYS_TYPES_H
    #  include <sys/types.h>
    #endif
    #ifdef HAVE_STDIO_H
    #  include <stdio.h>
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h stdio.h,
        [], [], [$curl_includes_stdio])
    ])
    
    
    
    dnl CURL_INCLUDES_STDLIB
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when stdlib.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_STDLIB], [
    curl_includes_stdlib="\
    /* includes start */
    #ifdef HAVE_SYS_TYPES_H
    #  include <sys/types.h>
    #endif
    #ifdef HAVE_STDLIB_H
    #  include <stdlib.h>
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h stdlib.h,
        [], [], [$curl_includes_stdlib])
    ])
    
    
    
    dnl CURL_INCLUDES_STRING
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    
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    dnl included when string(s).h is to be included.
    
    
    AC_DEFUN([CURL_INCLUDES_STRING], [
    curl_includes_string="\
    /* includes start */
    #ifdef HAVE_SYS_TYPES_H
    #  include <sys/types.h>
    #endif
    #ifdef HAVE_STRING_H
    #  include <string.h>
    #endif
    
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    #ifdef HAVE_STRINGS_H
    #  include <strings.h>
    #endif
    
    /* includes end */"
      AC_CHECK_HEADERS(
    
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        sys/types.h string.h strings.h,
    
        [], [], [$curl_includes_string])
    ])
    
    
    
    dnl CURL_INCLUDES_SYS_SOCKET
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when sys/socket.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_SYS_SOCKET], [
    curl_includes_sys_socket="\
    /* includes start */
    #ifdef HAVE_SYS_TYPES_H
    #  include <sys/types.h>
    #endif
    #ifdef HAVE_SYS_SOCKET_H
    #  include <sys/socket.h>
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h sys/socket.h,
        [], [], [$curl_includes_sys_socket])
    ])
    
    
    
    dnl CURL_INCLUDES_SYS_UIO
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when sys/uio.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_SYS_UIO], [
    curl_includes_sys_uio="\
    /* includes start */
    #ifdef HAVE_SYS_TYPES_H
    #  include <sys/types.h>
    #endif
    #ifdef HAVE_SYS_UIO_H
    #  include <sys/uio.h>
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h sys/uio.h,
        [], [], [$curl_includes_sys_uio])
    ])
    
    
    
    dnl CURL_INCLUDES_TIME
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when time.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_TIME], [
    AC_REQUIRE([AC_HEADER_TIME])dnl
    curl_includes_time="\
    /* includes start */
    #ifdef HAVE_SYS_TYPES_H
    #  include <sys/types.h>
    #endif
    #ifdef HAVE_SYS_TIME_H
    #  include <sys/time.h>
    #  ifdef TIME_WITH_SYS_TIME
    #    include <time.h>
    #  endif
    #else
    #  ifdef HAVE_TIME_H
    #    include <time.h>
    #  endif
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h sys/time.h time.h,
        [], [], [$curl_includes_time])
    ])
    
    
    
    dnl CURL_INCLUDES_UNISTD
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when unistd.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_UNISTD], [
    curl_includes_unistd="\
    /* includes start */
    #ifdef HAVE_SYS_TYPES_H
    #  include <sys/types.h>
    #endif
    #ifdef HAVE_UNISTD_H
    #  include <unistd.h>
    #endif
    /* includes end */"
      AC_CHECK_HEADERS(
        sys/types.h unistd.h,
        [], [], [$curl_includes_unistd])
    ])
    
    
    
    dnl CURL_INCLUDES_WINSOCK2
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when winsock(2).h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_WINSOCK2], [
    curl_includes_winsock2="\
    /* includes start */
    #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>
    #  else
    #    ifdef HAVE_WINSOCK_H
    #      include <winsock.h>
    #    endif
    #  endif
    #endif
    /* includes end */"
      CURL_CHECK_HEADER_WINDOWS
      CURL_CHECK_HEADER_WINSOCK
      CURL_CHECK_HEADER_WINSOCK2
    ])
    
    
    
    dnl CURL_INCLUDES_WS2TCPIP
    dnl -------------------------------------------------
    dnl Set up variable with list of headers that must be
    dnl included when ws2tcpip.h is to be included.
    
    AC_DEFUN([CURL_INCLUDES_WS2TCPIP], [
    curl_includes_ws2tcpip="\
    /* includes start */
    #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
    #endif
    /* includes end */"
      CURL_CHECK_HEADER_WINDOWS
      CURL_CHECK_HEADER_WINSOCK2
      CURL_CHECK_HEADER_WS2TCPIP
    ])
    
    
    
    dnl CURL_CHECK_FUNC_ALARM
    dnl -------------------------------------------------
    dnl Verify if alarm is available, prototyped, and
    dnl can be compiled. If all of these are true, and
    dnl usage has not been previously disallowed with
    dnl shell variable curl_disallow_alarm, then
    dnl HAVE_ALARM will be defined.
    
    AC_DEFUN([CURL_CHECK_FUNC_ALARM], [
      AC_REQUIRE([CURL_INCLUDES_UNISTD])dnl
      #
      tst_links_alarm="unknown"
      tst_proto_alarm="unknown"
      tst_compi_alarm="unknown"
      tst_allow_alarm="unknown"
      #
      AC_MSG_CHECKING([if alarm can be linked])
      AC_LINK_IFELSE([
        AC_LANG_FUNC_LINK_TRY([alarm])
      ],[
        AC_MSG_RESULT([yes])
        tst_links_alarm="yes"
      ],[
        AC_MSG_RESULT([no])
        tst_links_alarm="no"
      ])
      #
      if test "$tst_links_alarm" = "yes"; then
        AC_MSG_CHECKING([if alarm is prototyped])
        AC_EGREP_CPP([alarm],[
          $curl_includes_unistd
        ],[
          AC_MSG_RESULT([yes])
          tst_proto_alarm="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_proto_alarm="no"
        ])
      fi
      #
      if test "$tst_proto_alarm" = "yes"; then
        AC_MSG_CHECKING([if alarm is compilable])
        AC_COMPILE_IFELSE([
          AC_LANG_PROGRAM([[
            $curl_includes_unistd
          ]],[[
            if(0 != alarm(0))
              return 1;
          ]])
        ],[
          AC_MSG_RESULT([yes])
          tst_compi_alarm="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_compi_alarm="no"
        ])
      fi
      #
      if test "$tst_compi_alarm" = "yes"; then
        AC_MSG_CHECKING([if alarm usage allowed])
        if test "x$curl_disallow_alarm" != "xyes"; then
          AC_MSG_RESULT([yes])
          tst_allow_alarm="yes"
        else
          AC_MSG_RESULT([no])
          tst_allow_alarm="no"
        fi
      fi
      #
      AC_MSG_CHECKING([if alarm might be used])
      if test "$tst_links_alarm" = "yes" &&
         test "$tst_proto_alarm" = "yes" &&
         test "$tst_compi_alarm" = "yes" &&
         test "$tst_allow_alarm" = "yes"; then
        AC_MSG_RESULT([yes])
        AC_DEFINE_UNQUOTED(HAVE_ALARM, 1,
          [Define to 1 if you have the alarm function.])
        ac_cv_func_alarm="yes"
      else
        AC_MSG_RESULT([no])
        ac_cv_func_alarm="no"
      fi
    ])
    
    
    
    dnl CURL_CHECK_FUNC_FDOPEN
    dnl -------------------------------------------------
    dnl Verify if fdopen is available, prototyped, and
    dnl can be compiled. If all of these are true, and
    dnl usage has not been previously disallowed with
    dnl shell variable curl_disallow_fdopen, then
    dnl HAVE_FDOPEN will be defined.
    
    AC_DEFUN([CURL_CHECK_FUNC_FDOPEN], [
      AC_REQUIRE([CURL_INCLUDES_STDIO])dnl
      #
      tst_links_fdopen="unknown"
      tst_proto_fdopen="unknown"
      tst_compi_fdopen="unknown"
      tst_allow_fdopen="unknown"
      #
      AC_MSG_CHECKING([if fdopen can be linked])
      AC_LINK_IFELSE([
        AC_LANG_FUNC_LINK_TRY([fdopen])
      ],[
        AC_MSG_RESULT([yes])
        tst_links_fdopen="yes"
      ],[
        AC_MSG_RESULT([no])
        tst_links_fdopen="no"
      ])
      #
      if test "$tst_links_fdopen" = "yes"; then
        AC_MSG_CHECKING([if fdopen is prototyped])
        AC_EGREP_CPP([fdopen],[
          $curl_includes_stdio
        ],[
          AC_MSG_RESULT([yes])
          tst_proto_fdopen="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_proto_fdopen="no"
        ])
      fi
      #
      if test "$tst_proto_fdopen" = "yes"; then
        AC_MSG_CHECKING([if fdopen is compilable])
        AC_COMPILE_IFELSE([
          AC_LANG_PROGRAM([[
            $curl_includes_stdio
          ]],[[
            if(0 != fdopen(0, 0))
              return 1;
          ]])
        ],[
          AC_MSG_RESULT([yes])
          tst_compi_fdopen="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_compi_fdopen="no"
        ])
      fi
      #
      if test "$tst_compi_fdopen" = "yes"; then
        AC_MSG_CHECKING([if fdopen usage allowed])
        if test "x$curl_disallow_fdopen" != "xyes"; then
          AC_MSG_RESULT([yes])
          tst_allow_fdopen="yes"
        else
          AC_MSG_RESULT([no])
          tst_allow_fdopen="no"
        fi
      fi
      #
      AC_MSG_CHECKING([if fdopen might be used])
      if test "$tst_links_fdopen" = "yes" &&
         test "$tst_proto_fdopen" = "yes" &&
         test "$tst_compi_fdopen" = "yes" &&
         test "$tst_allow_fdopen" = "yes"; then
        AC_MSG_RESULT([yes])
        AC_DEFINE_UNQUOTED(HAVE_FDOPEN, 1,
          [Define to 1 if you have the fdopen function.])
        ac_cv_func_fdopen="yes"
      else
        AC_MSG_RESULT([no])
        ac_cv_func_fdopen="no"
      fi
    ])
    
    
    
    dnl CURL_CHECK_FUNC_FREEADDRINFO
    dnl -------------------------------------------------
    dnl Verify if freeaddrinfo is available, prototyped,
    dnl and can be compiled. If all of these are true,
    dnl and usage has not been previously disallowed with
    dnl shell variable curl_disallow_freeaddrinfo, then
    dnl HAVE_FREEADDRINFO will be defined.
    
    AC_DEFUN([CURL_CHECK_FUNC_FREEADDRINFO], [
      AC_REQUIRE([CURL_INCLUDES_WS2TCPIP])dnl
      AC_REQUIRE([CURL_INCLUDES_SYS_SOCKET])dnl
      AC_REQUIRE([CURL_INCLUDES_NETDB])dnl
      #
      tst_links_freeaddrinfo="unknown"
      tst_proto_freeaddrinfo="unknown"
      tst_compi_freeaddrinfo="unknown"
      tst_allow_freeaddrinfo="unknown"
      #
      AC_MSG_CHECKING([if freeaddrinfo can be linked])
      AC_LINK_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_ws2tcpip
          $curl_includes_sys_socket
          $curl_includes_netdb
        ]],[[
          freeaddrinfo(0);
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_links_freeaddrinfo="yes"
      ],[
        AC_MSG_RESULT([no])
        tst_links_freeaddrinfo="no"
      ])
      #
      if test "$tst_links_freeaddrinfo" = "yes"; then
        AC_MSG_CHECKING([if freeaddrinfo is prototyped])
        AC_EGREP_CPP([freeaddrinfo],[
          $curl_includes_ws2tcpip
          $curl_includes_sys_socket
          $curl_includes_netdb
        ],[
          AC_MSG_RESULT([yes])
          tst_proto_freeaddrinfo="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_proto_freeaddrinfo="no"
        ])
      fi
      #
      if test "$tst_proto_freeaddrinfo" = "yes"; then
        AC_MSG_CHECKING([if freeaddrinfo is compilable])
        AC_COMPILE_IFELSE([
          AC_LANG_PROGRAM([[
            $curl_includes_ws2tcpip
            $curl_includes_sys_socket
            $curl_includes_netdb
          ]],[[
            freeaddrinfo(0);
          ]])
        ],[
          AC_MSG_RESULT([yes])
          tst_compi_freeaddrinfo="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_compi_freeaddrinfo="no"
        ])
      fi
      #
      if test "$tst_compi_freeaddrinfo" = "yes"; then
        AC_MSG_CHECKING([if freeaddrinfo usage allowed])
        if test "x$curl_disallow_freeaddrinfo" != "xyes"; then
          AC_MSG_RESULT([yes])
          tst_allow_freeaddrinfo="yes"
        else
          AC_MSG_RESULT([no])
          tst_allow_freeaddrinfo="no"
        fi
      fi
      #
      AC_MSG_CHECKING([if freeaddrinfo might be used])
      if test "$tst_links_freeaddrinfo" = "yes" &&
         test "$tst_proto_freeaddrinfo" = "yes" &&
         test "$tst_compi_freeaddrinfo" = "yes" &&
         test "$tst_allow_freeaddrinfo" = "yes"; then
        AC_MSG_RESULT([yes])
        AC_DEFINE_UNQUOTED(HAVE_FREEADDRINFO, 1,
          [Define to 1 if you have the freeaddrinfo function.])
        ac_cv_func_freeaddrinfo="yes"
      else
        AC_MSG_RESULT([no])
        ac_cv_func_freeaddrinfo="no"
      fi
    ])
    
    
    
    dnl CURL_CHECK_FUNC_FREEIFADDRS
    dnl -------------------------------------------------
    dnl Verify if freeifaddrs is available, prototyped, and
    dnl can be compiled. If all of these are true, and
    dnl usage has not been previously disallowed with
    dnl shell variable curl_disallow_freeifaddrs, then
    dnl HAVE_FREEIFADDRS will be defined.
    
    AC_DEFUN([CURL_CHECK_FUNC_FREEIFADDRS], [
      AC_REQUIRE([CURL_INCLUDES_IFADDRS])dnl
      #
      tst_links_freeifaddrs="unknown"
      tst_proto_freeifaddrs="unknown"
      tst_compi_freeifaddrs="unknown"
      tst_allow_freeifaddrs="unknown"
      #
      AC_MSG_CHECKING([if freeifaddrs can be linked])
      AC_LINK_IFELSE([
        AC_LANG_FUNC_LINK_TRY([freeifaddrs])
      ],[
        AC_MSG_RESULT([yes])
        tst_links_freeifaddrs="yes"
      ],[
        AC_MSG_RESULT([no])
        tst_links_freeifaddrs="no"
      ])
      #
      if test "$tst_links_freeifaddrs" = "yes"; then
        AC_MSG_CHECKING([if freeifaddrs is prototyped])
        AC_EGREP_CPP([freeifaddrs],[
          $curl_includes_ifaddrs
        ],[
          AC_MSG_RESULT([yes])
          tst_proto_freeifaddrs="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_proto_freeifaddrs="no"
        ])
      fi
      #
      if test "$tst_proto_freeifaddrs" = "yes"; then
        AC_MSG_CHECKING([if freeifaddrs is compilable])
        AC_COMPILE_IFELSE([
          AC_LANG_PROGRAM([[
            $curl_includes_ifaddrs
          ]],[[
            freeifaddrs(0);
          ]])
        ],[
          AC_MSG_RESULT([yes])
          tst_compi_freeifaddrs="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_compi_freeifaddrs="no"
        ])
      fi
      #
      if test "$tst_compi_freeifaddrs" = "yes"; then
        AC_MSG_CHECKING([if freeifaddrs usage allowed])
        if test "x$curl_disallow_freeifaddrs" != "xyes"; then
          AC_MSG_RESULT([yes])
          tst_allow_freeifaddrs="yes"
        else
          AC_MSG_RESULT([no])
          tst_allow_freeifaddrs="no"
        fi
      fi
      #
      AC_MSG_CHECKING([if freeifaddrs might be used])
      if test "$tst_links_freeifaddrs" = "yes" &&
         test "$tst_proto_freeifaddrs" = "yes" &&
         test "$tst_compi_freeifaddrs" = "yes" &&
         test "$tst_allow_freeifaddrs" = "yes"; then
        AC_MSG_RESULT([yes])
        AC_DEFINE_UNQUOTED(HAVE_FREEIFADDRS, 1,
          [Define to 1 if you have the freeifaddrs function.])
        ac_cv_func_freeifaddrs="yes"
      else
        AC_MSG_RESULT([no])
        ac_cv_func_freeifaddrs="no"
      fi
    ])
    
    
    
    dnl CURL_CHECK_FUNC_FTRUNCATE
    dnl -------------------------------------------------
    dnl Verify if ftruncate is available, prototyped, and
    dnl can be compiled. If all of these are true, and
    dnl usage has not been previously disallowed with
    dnl shell variable curl_disallow_ftruncate, then
    dnl HAVE_FTRUNCATE will be defined.
    
    AC_DEFUN([CURL_CHECK_FUNC_FTRUNCATE], [
      AC_REQUIRE([CURL_INCLUDES_UNISTD])dnl
      #
      tst_links_ftruncate="unknown"
      tst_proto_ftruncate="unknown"
      tst_compi_ftruncate="unknown"
      tst_allow_ftruncate="unknown"
      #
      AC_MSG_CHECKING([if ftruncate can be linked])
      AC_LINK_IFELSE([
        AC_LANG_FUNC_LINK_TRY([ftruncate])
      ],[
        AC_MSG_RESULT([yes])
        tst_links_ftruncate="yes"
      ],[
        AC_MSG_RESULT([no])
        tst_links_ftruncate="no"
      ])
      #
      if test "$tst_links_ftruncate" = "yes"; then
        AC_MSG_CHECKING([if ftruncate is prototyped])
        AC_EGREP_CPP([ftruncate],[
          $curl_includes_unistd
        ],[
          AC_MSG_RESULT([yes])
          tst_proto_ftruncate="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_proto_ftruncate="no"
        ])
      fi
      #
      if test "$tst_proto_ftruncate" = "yes"; then
        AC_MSG_CHECKING([if ftruncate is compilable])
        AC_COMPILE_IFELSE([
          AC_LANG_PROGRAM([[
            $curl_includes_unistd
          ]],[[
            if(0 != ftruncate(0, 0))
              return 1;
          ]])
        ],[
          AC_MSG_RESULT([yes])
          tst_compi_ftruncate="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_compi_ftruncate="no"
        ])
      fi
      #
      if test "$tst_compi_ftruncate" = "yes"; then
        AC_MSG_CHECKING([if ftruncate usage allowed])
        if test "x$curl_disallow_ftruncate" != "xyes"; then
          AC_MSG_RESULT([yes])
          tst_allow_ftruncate="yes"
        else
          AC_MSG_RESULT([no])
          tst_allow_ftruncate="no"
        fi
      fi
      #
      AC_MSG_CHECKING([if ftruncate might be used])
      if test "$tst_links_ftruncate" = "yes" &&
         test "$tst_proto_ftruncate" = "yes" &&
         test "$tst_compi_ftruncate" = "yes" &&
         test "$tst_allow_ftruncate" = "yes"; then
        AC_MSG_RESULT([yes])
        AC_DEFINE_UNQUOTED(HAVE_FTRUNCATE, 1,
          [Define to 1 if you have the ftruncate function.])
        ac_cv_func_ftruncate="yes"
      else
        AC_MSG_RESULT([no])
        ac_cv_func_ftruncate="no"
      fi
    ])
    
    
    
    dnl CURL_CHECK_FUNC_GETADDRINFO
    dnl -------------------------------------------------
    dnl Verify if getaddrinfo is available, prototyped, can
    dnl be compiled and seems to work. If all of these are
    dnl true, and usage has not been previously disallowed
    dnl with shell variable curl_disallow_getaddrinfo, then
    dnl HAVE_GETADDRINFO will be defined.
    
    AC_DEFUN([CURL_CHECK_FUNC_GETADDRINFO], [
      AC_REQUIRE([CURL_INCLUDES_WS2TCPIP])dnl
      AC_REQUIRE([CURL_INCLUDES_STDLIB])dnl
      AC_REQUIRE([CURL_INCLUDES_SYS_SOCKET])dnl
      AC_REQUIRE([CURL_INCLUDES_NETDB])dnl
      #
      tst_links_getaddrinfo="unknown"
      tst_proto_getaddrinfo="unknown"
      tst_compi_getaddrinfo="unknown"
      tst_works_getaddrinfo="unknown"
      tst_allow_getaddrinfo="unknown"
      #
      AC_MSG_CHECKING([if getaddrinfo can be linked])
      AC_LINK_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_ws2tcpip
          $curl_includes_sys_socket
          $curl_includes_netdb
        ]],[[
          if(0 != getaddrinfo(0, 0, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_links_getaddrinfo="yes"
      ],[
        AC_MSG_RESULT([no])
        tst_links_getaddrinfo="no"
      ])
      #
      if test "$tst_links_getaddrinfo" = "yes"; then
        AC_MSG_CHECKING([if getaddrinfo is prototyped])
        AC_EGREP_CPP([getaddrinfo],[
          $curl_includes_ws2tcpip
          $curl_includes_sys_socket
          $curl_includes_netdb
        ],[
          AC_MSG_RESULT([yes])
          tst_proto_getaddrinfo="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_proto_getaddrinfo="no"
        ])
      fi
      #
      if test "$tst_proto_getaddrinfo" = "yes"; then
        AC_MSG_CHECKING([if getaddrinfo is compilable])
        AC_COMPILE_IFELSE([
          AC_LANG_PROGRAM([[
            $curl_includes_ws2tcpip
            $curl_includes_sys_socket
            $curl_includes_netdb
          ]],[[
            if(0 != getaddrinfo(0, 0, 0, 0))
              return 1;
          ]])
        ],[
          AC_MSG_RESULT([yes])
          tst_compi_getaddrinfo="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_compi_getaddrinfo="no"
        ])
      fi
      #
      dnl only do runtime verification when not cross-compiling
      if test "x$cross_compiling" != "xyes" &&
        test "$tst_compi_getaddrinfo" = "yes"; then
        AC_MSG_CHECKING([if getaddrinfo seems to work])
        AC_RUN_IFELSE([
          AC_LANG_PROGRAM([[
            $curl_includes_ws2tcpip
            $curl_includes_stdlib
            $curl_includes_sys_socket
            $curl_includes_netdb
          ]],[[
            struct addrinfo hints;
            struct addrinfo *ai = 0;
            int error;
    
            memset(&hints, 0, sizeof(hints));
            hints.ai_flags = AI_NUMERICHOST;
            hints.ai_family = AF_UNSPEC;
            hints.ai_socktype = SOCK_STREAM;
            error = getaddrinfo("127.0.0.1", 0, &hints, &ai);
            if(error || !ai)
              exit(1); /* fail */
            else
              exit(0);
          ]])
        ],[
          AC_MSG_RESULT([yes])
          tst_works_getaddrinfo="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_works_getaddrinfo="no"
        ])
      fi
      #
      if test "$tst_compi_getaddrinfo" = "yes" &&
        test "$tst_works_getaddrinfo" != "no"; then
        AC_MSG_CHECKING([if getaddrinfo usage allowed])
        if test "x$curl_disallow_getaddrinfo" != "xyes"; then
          AC_MSG_RESULT([yes])
          tst_allow_getaddrinfo="yes"
        else
          AC_MSG_RESULT([no])
          tst_allow_getaddrinfo="no"
        fi
      fi
      #
      AC_MSG_CHECKING([if getaddrinfo might be used])
      if test "$tst_links_getaddrinfo" = "yes" &&
         test "$tst_proto_getaddrinfo" = "yes" &&
         test "$tst_compi_getaddrinfo" = "yes" &&
         test "$tst_allow_getaddrinfo" = "yes" &&
         test "$tst_works_getaddrinfo" != "no"; then
        AC_MSG_RESULT([yes])
        AC_DEFINE_UNQUOTED(HAVE_GETADDRINFO, 1,
          [Define to 1 if you have a working getaddrinfo function.])
        ac_cv_func_getaddrinfo="yes"
      else
        AC_MSG_RESULT([no])
        ac_cv_func_getaddrinfo="no"
      fi
    
    dnl CURL_CHECK_FUNC_GETHOSTBYADDR_R
    dnl -------------------------------------------------
    dnl Verify if gethostbyaddr_r is available, prototyped,
    dnl and can be compiled. If all of these are true, and
    dnl usage has not been previously disallowed with
    dnl shell variable curl_disallow_gethostbyaddr_r, then
    dnl HAVE_GETHOSTBYADDR_R will be defined.
    
    AC_DEFUN([CURL_CHECK_FUNC_GETHOSTBYADDR_R], [
    
      AC_REQUIRE([CURL_INCLUDES_NETDB])dnl
    
      #
      tst_links_gethostbyaddr_r="unknown"
      tst_proto_gethostbyaddr_r="unknown"
      tst_compi_gethostbyaddr_r="unknown"
      tst_allow_gethostbyaddr_r="unknown"
      tst_nargs_gethostbyaddr_r="unknown"
      #
      AC_MSG_CHECKING([if gethostbyaddr_r can be linked])
      AC_LINK_IFELSE([
        AC_LANG_FUNC_LINK_TRY([gethostbyaddr_r])
      ],[
        AC_MSG_RESULT([yes])
        tst_links_gethostbyaddr_r="yes"
      ],[
        AC_MSG_RESULT([no])
        tst_links_gethostbyaddr_r="no"
      ])
      #
      if test "$tst_links_gethostbyaddr_r" = "yes"; then
        AC_MSG_CHECKING([if gethostbyaddr_r is prototyped])
        AC_EGREP_CPP([gethostbyaddr_r],[
          $curl_includes_netdb
        ],[
          AC_MSG_RESULT([yes])
          tst_proto_gethostbyaddr_r="yes"
        ],[
          AC_MSG_RESULT([no])
          tst_proto_gethostbyaddr_r="no"
        ])
      fi
      #
      if test "$tst_proto_gethostbyaddr_r" = "yes"; then
        if test "$tst_nargs_gethostbyaddr_r" = "unknown"; then
          AC_MSG_CHECKING([if gethostbyaddr_r takes 5 args.])
          AC_COMPILE_IFELSE([
            AC_LANG_PROGRAM([[
              $curl_includes_netdb
            ]],[[
              if(0 != gethostbyaddr_r(0, 0, 0, 0, 0))
                return 1;
            ]])
          ],[
            AC_MSG_RESULT([yes])
            tst_compi_gethostbyaddr_r="yes"
            tst_nargs_gethostbyaddr_r="5"
          ],[
            AC_MSG_RESULT([no])
            tst_compi_gethostbyaddr_r="no"
          ])
        fi
        if test "$tst_nargs_gethostbyaddr_r" = "unknown"; then
          AC_MSG_CHECKING([if gethostbyaddr_r takes 7 args.])
          AC_COMPILE_IFELSE([
            AC_LANG_PROGRAM([[
              $curl_includes_netdb
            ]],[[
              if(0 != gethostbyaddr_r(0, 0, 0, 0, 0, 0, 0))
                return 1;
            ]])
          ],[
            AC_MSG_RESULT([yes])
            tst_compi_gethostbyaddr_r="yes"