configure.ac

#***************************************************************************
#                                  _   _ ____  _
#  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.
#
# $Id$
#***************************************************************************
dnl Process this file with autoconf to produce a configure script.

AC_PREREQ(2.57)

dnl We don't know the version number "statically" so we use a dash here
AC_INIT([curl], [-], [a suitable curl mailing list => http://curl.haxx.se/mail/])

dnl configure script copyright
AC_COPYRIGHT([Copyright (c) 1998 - 2008 Daniel Stenberg, <daniel@haxx.se>
This configure script may be copied, distributed and modified under the
terms of the curl license; see COPYING for more details])

AC_CONFIG_SRCDIR([lib/urldata.h])
AM_CONFIG_HEADER(lib/config.h src/config.h include/curl/curlbuild.h)
AM_MAINTAINER_MODE

dnl SED is mandatory for configure process and libtool.
dnl Set it now, allowing it to be changed later.
AC_PATH_PROG([SED], [sed], [not_found],
  [$PATH:/usr/bin:/usr/local/bin])
if test -z "$SED" || test "$SED" = "not_found"; then
  AC_MSG_ERROR([sed not found in PATH. Cannot continue without sed.])
fi
AC_SUBST([SED])

dnl GREP is mandatory for configure process and libtool.
dnl Set it now, allowing it to be changed later.
AC_PATH_PROG([GREP], [grep], [not_found],
  [$PATH:/usr/bin:/usr/local/bin])
if test -z "$GREP" || test "$GREP" = "not_found"; then
  AC_MSG_ERROR([grep not found in PATH. Cannot continue without grep.])
fi
AC_SUBST([GREP])

dnl EGREP is mandatory for configure process and libtool.
dnl Set it now, allowing it to be changed later.
if echo a | ($GREP -E '(a|b)') >/dev/null 2>&1; then
  AC_MSG_CHECKING([for egrep])
  EGREP="$GREP -E"
  AC_MSG_RESULT([$EGREP])
else
  AC_PATH_PROG([EGREP], [egrep], [not_found],
    [$PATH:/usr/bin:/usr/local/bin])
fi
if test -z "$EGREP" || test "$EGREP" = "not_found"; then
  AC_MSG_ERROR([egrep not found in PATH. Cannot continue without egrep.])
fi
AC_SUBST([EGREP])

dnl AR is mandatory for configure process and libtool.
dnl This is target dependant, so check it as a tool.
AC_PATH_TOOL([AR], [ar], [not_found],
  [$PATH:/usr/bin:/usr/local/bin])
if test -z "$AR" || test "$AR" = "not_found"; then
  AC_MSG_ERROR([ar not found in PATH. Cannot continue without ar.])
fi
AC_SUBST([AR])

AC_SUBST(libext)

dnl figure out the libcurl version
VERSION=`$SED -ne 's/^#define LIBCURL_VERSION "\(.*\)"/\1/p' ${srcdir}/include/curl/curlver.h`
AM_INIT_AUTOMAKE(curl,$VERSION)
AC_MSG_CHECKING([curl version])
AC_MSG_RESULT($VERSION)

dnl
dnl we extract the numerical version for curl-config only
VERSIONNUM=`$SED -ne 's/^#define LIBCURL_VERSION_NUM 0x\(.*\)/\1/p' ${srcdir}/include/curl/curlver.h`
AC_SUBST(VERSIONNUM)

dnl Solaris pkgadd support definitions
PKGADD_PKG="HAXXcurl"
PKGADD_NAME="cURL - a client that groks URLs"
PKGADD_VENDOR="curl.haxx.se"
AC_SUBST(PKGADD_PKG)
AC_SUBST(PKGADD_NAME)
AC_SUBST(PKGADD_VENDOR)

dnl
dnl initialize all the info variables
    curl_ssl_msg="no      (--with-ssl / --with-gnutls)"
    curl_ssh_msg="no      (--with-libssh2)"
   curl_zlib_msg="no      (--with-zlib)"
   curl_krb4_msg="no      (--with-krb4*)"
    curl_gss_msg="no      (--with-gssapi)"
 curl_spnego_msg="no      (--with-spnego)"
   curl_ares_msg="no      (--enable-ares)"
   curl_ipv6_msg="no      (--enable-ipv6)"
    curl_idn_msg="no      (--with-libidn)"
 curl_manual_msg="no      (--enable-manual)"
curl_verbose_msg="enabled (--disable-verbose)"
   curl_sspi_msg="no      (--enable-sspi)"
   curl_ldap_msg="no      (--enable-ldap / --with-ldap-lib / --with-lber-lib)"
  curl_ldaps_msg="no      (--enable-ldaps)"

dnl
dnl Save anything in $LIBS for later
dnl
ALL_LIBS=$LIBS

dnl
dnl Detect the canonical host and target build environment
dnl

AC_CANONICAL_HOST
dnl Get system canonical name
AC_DEFINE_UNQUOTED(OS, "${host}", [cpu-machine-OS])

dnl Checks for programs.
AC_PROG_CC

dnl Our curl_off_t internal and external configure settings
CURL_CONFIGURE_CURL_OFF_T

dnl This defines _ALL_SOURCE for AIX
CURL_CHECK_AIX_ALL_SOURCE

dnl Our configure and build reentrant settings
CURL_CONFIGURE_REENTRANT

dnl check for how to do large files
AC_SYS_LARGEFILE

dnl support building of Windows DLLs
AC_LIBTOOL_WIN32_DLL

dnl skip libtool C++ and Fortran compiler checks
m4_ifdef([AC_PROG_CXX], [m4_undefine([AC_PROG_CXX])])
m4_defun([AC_PROG_CXX],[])
m4_ifdef([AC_PROG_CXXCPP], [m4_undefine([AC_PROG_CXXCPP])])
m4_defun([AC_PROG_CXXCPP],[true])
m4_ifdef([AC_PROG_F77], [m4_undefine([AC_PROG_F77])])
m4_defun([AC_PROG_F77],[])

dnl skip libtool C++ and Fortran linker checks
m4_ifdef([AC_LIBTOOL_CXX], [m4_undefine([AC_LIBTOOL_CXX])])
m4_defun([AC_LIBTOOL_CXX],[])
m4_ifdef([AC_LIBTOOL_CXXCPP], [m4_undefine([AC_LIBTOOL_CXXCPP])])
m4_defun([AC_LIBTOOL_CXXCPP],[true])
m4_ifdef([AC_LIBTOOL_F77], [m4_undefine([AC_LIBTOOL_F77])])
m4_defun([AC_LIBTOOL_F77],[])

dnl force libtool to build static libraries with PIC on AMD64-Linux & FreeBSD
AC_MSG_CHECKING([if arch-OS host is AMD64-Linux/FreeBSD (to build static libraries with PIC)])
case $host in
  x86_64*linux*|amd64*freebsd*|ia64*freebsd*)
    AC_MSG_RESULT([yes])
    with_pic=yes
    ;;
  *)
    AC_MSG_RESULT([no])
    ;;
esac

dnl libtool setup
AC_PROG_LIBTOOL

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

AC_MSG_CHECKING([if we need -mimpure-text])
mimpure=no
case $host in
  *-*-solaris2*)
    if test "$GCC" = "yes"; then
      mimpure="yes"
    fi
    ;;
  *)
    ;;
esac
AC_MSG_RESULT($mimpure)
AM_CONDITIONAL(MIMPURE, test x$mimpure = xyes)
AM_CONDITIONAL(STATICLIB, false)

AC_MSG_CHECKING([if we need BUILDING_LIBCURL])
case $host in
  *-*-mingw*)
    AC_DEFINE(BUILDING_LIBCURL, 1, [when building libcurl itself])
    AC_MSG_RESULT(yes)
    AC_MSG_CHECKING([if we need CURL_STATICLIB])
    if test "X$enable_shared" = "Xno"
    then
      AC_DEFINE(CURL_STATICLIB, 1, [when not building a shared library])
      AC_MSG_RESULT(yes)
      AM_CONDITIONAL(STATICLIB, true)
    else
      AC_MSG_RESULT(no)
    fi
    ;;
  *)
    AC_MSG_RESULT(no)
    ;;
esac

# Determine whether all dependent libraries must be specified when linking
if test "X$enable_shared" = "Xyes" -a "X$link_all_deplibs" = "Xno"
then
    REQUIRE_LIB_DEPS=no
else
    REQUIRE_LIB_DEPS=yes
fi
AC_SUBST(REQUIRE_LIB_DEPS)

dnl The install stuff has already been taken care of by the automake stuff
dnl AC_PROG_INSTALL
AC_PROG_MAKE_SET

dnl check if there's a way to force code inline
AC_C_INLINE

dnl **********************************************************************
dnl platform/compiler/architecture specific checks/flags
dnl **********************************************************************

case $host in
  #
  x86_64*linux*|amd64*freebsd*|ia64*freebsd*)
    #
    dnl find out if icc is being used
    if test "z$ICC" = "z"; then
      CURL_DETECT_ICC
    fi
    #
    if test "$ICC" = "yes"; then
      dnl figure out icc version
      AC_MSG_CHECKING([icc version])
      iccver=`$CC -dumpversion`
      iccnhi=`echo $iccver | cut -d . -f1`
      iccnlo=`echo $iccver | cut -d . -f2`
      iccnum=`(expr $iccnhi "*" 100 + $iccnlo) 2>/dev/null`
      AC_MSG_RESULT($iccver)
      #
      if test "$iccnum" -ge "900" && test "$iccnum" -lt "1000"; then
        dnl icc 9.X specific
        CFLAGS="$CFLAGS -i-dynamic"
      fi
      #
      if test "$iccnum" -ge "1000"; then
        dnl icc 10.X or later
        CFLAGS="$CFLAGS -shared-intel"
      fi
      #
    fi
    ;;
  #
esac

AC_MSG_CHECKING([whether we are using the IBM C compiler])
CURL_CHECK_DEF([__IBMC__], [], [silent])
if test "$curl_cv_have_def___IBMC__" = "yes"; then
  AC_MSG_RESULT([yes])
  dnl Ensure that compiler optimizations are always thread-safe.
  CFLAGS="$CFLAGS -qthreaded"
  dnl Disable type based strict aliasing optimizations, using worst
  dnl case aliasing assumptions when compiling. Type based aliasing
  dnl would restrict the lvalues that could be safely used to access
  dnl a data object.
  CFLAGS="$CFLAGS -qnoansialias"
  dnl Force compiler to stop after the compilation phase, without
  dnl generating an object code file when compilation has errors.
  CFLAGS="$CFLAGS -qhalt=e"
else
  AC_MSG_RESULT([no])
fi

AC_MSG_CHECKING([whether we are using the Intel C compiler])
CURL_CHECK_DEF([__INTEL_COMPILER], [], [silent])
if test "$curl_cv_have_def___INTEL_COMPILER" = "yes"; then
  AC_MSG_RESULT([yes])
  dnl Select strict ANSI C conformance
  CPPFLAGS="$CPPFLAGS -strict-ansi"
  dnl Select ANSI C dialect
  CPPFLAGS="$CPPFLAGS -std=c89 -D__STRICT_ANSI__"
  dnl Change some warnings into errors
  dnl #140: too many arguments in function call
  dnl #147: declaration is incompatible with 'previous one'
  dnl #165: too few arguments in function call
  dnl #266: function declared implicitly
  CPPFLAGS="$CPPFLAGS -we 140,147,165,266"
  dnl Disable use of ANSI C aliasing rules in optimizations
  CFLAGS="$CFLAGS -no-ansi-alias"
else
  AC_MSG_RESULT([no])
fi

AC_MSG_CHECKING([whether we are using the DEC/Compaq C compiler])
CURL_CHECK_DEF([__DECC], [], [silent])
CURL_CHECK_DEF([__DECC_VER], [], [silent])
if test "$curl_cv_have_def___DECC" = "yes" &&
  test "$curl_cv_have_def___DECC_VER" = "yes"; then
  AC_MSG_RESULT([yes])
  dnl Select strict ANSI C compiler mode
  CFLAGS="$CFLAGS -std1"
  dnl Turn off optimizer ANSI C aliasing rules
  CFLAGS="$CFLAGS -noansi_alias"
  dnl Select a higher warning level than default level2
  CFLAGS="$CFLAGS -msg_enable level3"
  dnl Generate warnings for missing function prototypes
  CFLAGS="$CFLAGS -warnprotos"
  dnl Change some warnings into fatal errors
  CFLAGS="$CFLAGS -msg_fatal toofewargs,toomanyargs"
else
  AC_MSG_RESULT([no])
fi

CURL_CHECK_COMPILER_HALT_ON_ERROR
CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE

dnl **********************************************************************
dnl Compilation based checks should not be done before this point.
dnl **********************************************************************

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_NATIVE_WINDOWS
case X-"$ac_cv_native_windows" in
  X-yes)
    CURL_CHECK_HEADER_WINSOCK
    CURL_CHECK_HEADER_WINSOCK2
    CURL_CHECK_HEADER_WS2TCPIP
    CURL_CHECK_HEADER_WINLDAP
    CURL_CHECK_HEADER_WINBER
    ;;
  *)
    ac_cv_header_winsock_h="no"
    ac_cv_header_winsock2_h="no"
    ac_cv_header_ws2tcpip_h="no"
    ac_cv_header_winldap_h="no"
    ac_cv_header_winber_h="no"
    ;;
esac
CURL_CHECK_WIN32_LARGEFILE

dnl ************************************************************
dnl switch off particular protocols
dnl
AC_MSG_CHECKING([whether to support http])
AC_ARG_ENABLE(http,
AC_HELP_STRING([--enable-http],[Enable HTTP support])
AC_HELP_STRING([--disable-http],[Disable HTTP support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_HTTP, 1, [to disable HTTP])
       AC_MSG_WARN([disable HTTP disables FTP over proxy])
       AC_SUBST(CURL_DISABLE_HTTP, [1])
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)
AC_MSG_CHECKING([whether to support ftp])
AC_ARG_ENABLE(ftp,
AC_HELP_STRING([--enable-ftp],[Enable FTP support])
AC_HELP_STRING([--disable-ftp],[Disable FTP support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_FTP, 1, [to disable FTP])
       AC_SUBST(CURL_DISABLE_FTP, [1])
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)
AC_MSG_CHECKING([whether to support file])
AC_ARG_ENABLE(file,
AC_HELP_STRING([--enable-file],[Enable FILE support])
AC_HELP_STRING([--disable-file],[Disable FILE support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_FILE, 1, [to disable FILE])
       AC_SUBST(CURL_DISABLE_FILE, [1])
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)
AC_MSG_CHECKING([whether to support ldap])
AC_ARG_ENABLE(ldap,
AC_HELP_STRING([--enable-ldap],[Enable LDAP support])
AC_HELP_STRING([--disable-ldap],[Disable LDAP support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_LDAP, 1, [to disable LDAP])
       AC_SUBST(CURL_DISABLE_LDAP, [1])
       ;;
  *)
       case $host in
         *-*-cygwin*)
           # Force no ldap. config/build process is broken for cygwin
           AC_DEFINE(CURL_DISABLE_LDAP, 1, [to disable LDAP])
           AC_SUBST(CURL_DISABLE_LDAP, [1])
           AC_MSG_RESULT(no)
           ;;
         *)
           AC_MSG_RESULT(yes)
       esac
       ;;
  esac ],[
       case $host in
         *-*-cygwin*)
           # Force no ldap. config/build process is broken for cygwin
           AC_DEFINE(CURL_DISABLE_LDAP, 1, [to disable LDAP])
           AC_SUBST(CURL_DISABLE_LDAP, [1])
           AC_MSG_RESULT(no)
           ;;
         *)
           AC_MSG_RESULT(yes)
       esac ]
)
AC_MSG_CHECKING([whether to support ldaps])
AC_ARG_ENABLE(ldaps,
AC_HELP_STRING([--enable-ldaps],[Enable LDAPS support])
AC_HELP_STRING([--disable-ldaps],[Disable LDAPS support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_LDAPS, 1, [to disable LDAPS])
       AC_SUBST(CURL_DISABLE_LDAPS, [1])
       ;;
  *)   if test x$CURL_DISABLE_LDAP = x1 ; then
               AC_MSG_RESULT(LDAP support needs to be enabled in order to enable LDAPS support!)
               AC_DEFINE(CURL_DISABLE_LDAPS, 1, [to disable LDAPS])
               AC_SUBST(CURL_DISABLE_LDAPS, [1])
       else
               AC_MSG_RESULT(yes)
               AC_DEFINE(HAVE_LDAP_SSL, 1, [Use LDAPS implementation])
               curl_ldaps_msg="enabled"
       fi
       ;;
  esac ],
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_LDAPS, 1, [to disable LDAPS])
       AC_SUBST(CURL_DISABLE_LDAPS, [1])
)

AC_MSG_CHECKING([whether to support dict])
AC_ARG_ENABLE(dict,
AC_HELP_STRING([--enable-dict],[Enable DICT support])
AC_HELP_STRING([--disable-dict],[Disable DICT support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_DICT, 1, [to disable DICT])
       AC_SUBST(CURL_DISABLE_DICT, [1])
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)
AC_MSG_CHECKING([whether to support telnet])
AC_ARG_ENABLE(telnet,
AC_HELP_STRING([--enable-telnet],[Enable TELNET support])
AC_HELP_STRING([--disable-telnet],[Disable TELNET support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_TELNET, 1, [to disable TELNET])
       AC_SUBST(CURL_DISABLE_TELNET, [1])
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)
AC_MSG_CHECKING([whether to support tftp])
AC_ARG_ENABLE(tftp,
AC_HELP_STRING([--enable-tftp],[Enable TFTP support])
AC_HELP_STRING([--disable-tftp],[Disable TFTP support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_TFTP, 1, [to disable TFTP])
       AC_SUBST(CURL_DISABLE_TFTP, [1])
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)

dnl **********************************************************************
dnl Check for built-in manual
dnl **********************************************************************

AC_MSG_CHECKING([whether to provide built-in manual])
AC_ARG_ENABLE(manual,
AC_HELP_STRING([--enable-manual],[Enable built-in manual])
AC_HELP_STRING([--disable-manual],[Disable built-in manual]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       ;;
  *)   AC_MSG_RESULT(yes)
       USE_MANUAL="1"
       ;;
  esac ],
       AC_MSG_RESULT(yes)
       USE_MANUAL="1"
)
dnl The actual use of the USE_MANUAL variable is done much later in this
dnl script to allow other actions to disable it as well.

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 $LIBS"
  AC_LINK_IFELSE([
    AC_LANG_PROGRAM([[
    ]],[[
      gethostbyname();
    ]])
  ],[
    AC_MSG_RESULT([yes])
    HAVE_GETHOSTBYNAME="1"
  ],[
    AC_MSG_RESULT([no])
    LIBS=$my_ac_save_LIBS
  ])
fi

if test "$HAVE_GETHOSTBYNAME" != "1"
then
  dnl This is for winsock systems
  if test "$ac_cv_header_windows_h" = "yes"; then
    if test "$ac_cv_header_winsock_h" = "yes"; then
      case $host in
        *-*-mingw32ce*)
          winsock_LIB="-lwinsock"
          ;;
        *)
          winsock_LIB="-lwsock32"
          ;;
      esac
    fi
    if test "$ac_cv_header_winsock2_h" = "yes"; then
      winsock_LIB="-lws2_32"
    fi
    if test ! -z "$winsock_LIB"; then
      my_ac_save_LIBS=$LIBS
      LIBS="$winsock_LIB $LIBS"
      AC_MSG_CHECKING([for gethostbyname in $winsock_LIB])
      AC_LINK_IFELSE([
        AC_LANG_PROGRAM([[
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#else
#ifdef HAVE_WINSOCK_H
#include <winsock.h>
#endif
#endif
#endif
        ]],[[
          gethostbyname("www.dummysite.com");
        ]])
      ],[
        AC_MSG_RESULT([yes])
        HAVE_GETHOSTBYNAME="1"
      ],[
        AC_MSG_RESULT([no])
        winsock_LIB=""
        LIBS=$my_ac_save_LIBS
      ])
    fi
  fi
fi

if test "$HAVE_GETHOSTBYNAME" != "1"
then
  dnl This is for Minix 3.1
  AC_MSG_CHECKING([for gethostbyname for Minix 3])
  AC_LINK_IFELSE([
    AC_LANG_PROGRAM([[
/* Older Minix versions may need <net/gen/netdb.h> here instead */
#include <netdb.h>
    ]],[[
      gethostbyname("www.dummysite.com");
    ]])
  ],[
    AC_MSG_RESULT([yes])
    HAVE_GETHOSTBYNAME="1"
  ],[
    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_LINK_IFELSE([
    AC_LANG_PROGRAM([[
#include <stdio.h>
#include <netdb.h>
    ]],[[
      gethostbyname("www.dummysite.com");
    ]])
  ],[
    AC_MSG_RESULT([yes])
    HAVE_GETHOSTBYNAME="1"
  ],[
    AC_MSG_RESULT([no])
  ])
fi

if test "$HAVE_GETHOSTBYNAME" != "1"
then
  dnl gethostbyname in the network lib - for Haiku OS
  AC_CHECK_LIB(network, gethostbyname,
               [HAVE_GETHOSTBYNAME="1"
               LIBS="$LIBS -lnetwork"
               ])
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 **********************************************************************
dnl In case that function clock_gettime with monotonic timer is available,
dnl check for additional required libraries.
dnl **********************************************************************
CURL_CHECK_LIBS_CLOCK_GETTIME_MONOTONIC

dnl **********************************************************************
dnl The preceding library checks are all potentially useful for test
dnl servers (for providing networking support).  Save the list of required
dnl libraries at this point for use while linking those test servers.
dnl **********************************************************************
TEST_SERVER_LIBS=$LIBS

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

dnl **********************************************************************
dnl Check for LDAP
dnl **********************************************************************

LDAPLIBNAME=""
AC_ARG_WITH(ldap-lib,
AC_HELP_STRING([--with-ldap-lib=libname],[Specify name of ldap lib file]),
 [LDAPLIBNAME="$withval"])

LBERLIBNAME=""
AC_ARG_WITH(lber-lib,
AC_HELP_STRING([--with-lber-lib=libname],[Specify name of lber lib file]),
 [LBERLIBNAME="$withval"])

if test x$CURL_DISABLE_LDAP != x1 ; then

  CURL_CHECK_HEADER_LBER
  CURL_CHECK_HEADER_LDAP
  CURL_CHECK_HEADER_LDAPSSL
  CURL_CHECK_HEADER_LDAP_SSL

  if test -z "$LDAPLIBNAME" ; then
    case $host in
      *-*-cygwin* | *-*-mingw* | *-*-pw32*)
        dnl Windows uses a single and unique OpenLDAP DLL name
        LDAPLIBNAME="wldap32"
        LBERLIBNAME="no"
        ;;
    esac
  fi

  if test "$LDAPLIBNAME" ; then
    AC_CHECK_LIB("$LDAPLIBNAME", ldap_init,, [
      AC_MSG_WARN(["$LDAPLIBNAME" is not an LDAP library: LDAP disabled])
      AC_DEFINE(CURL_DISABLE_LDAP, 1, [to disable LDAP])
      AC_SUBST(CURL_DISABLE_LDAP, [1])])
      AC_DEFINE(CURL_DISABLE_LDAPS, 1, [to disable LDAPS])
      AC_SUBST(CURL_DISABLE_LDAPS, [1])
  else
    dnl Try to find the right ldap libraries for this system
    CURL_CHECK_LIBS_LDAP
    case X-"$curl_cv_ldap_LIBS" in
      X-unknown)
        AC_MSG_WARN([Cannot find libraries for LDAP support: LDAP disabled])
        AC_DEFINE(CURL_DISABLE_LDAP, 1, [to disable LDAP])
        AC_SUBST(CURL_DISABLE_LDAP, [1])
        AC_DEFINE(CURL_DISABLE_LDAPS, 1, [to disable LDAPS])
        AC_SUBST(CURL_DISABLE_LDAPS, [1])
        ;;
    esac
  fi
fi

if test x$CURL_DISABLE_LDAP != x1 ; then

  if test "$LBERLIBNAME" ; then
    dnl If name is "no" then don't define this library at all
    dnl (it's only needed if libldap.so's dependencies are broken).
    if test "$LBERLIBNAME" != "no" ; then
      AC_CHECK_LIB("$LBERLIBNAME", ber_free,, [
        AC_MSG_WARN(["$LBERLIBNAME" is not an LBER library: LDAP disabled])
        AC_DEFINE(CURL_DISABLE_LDAP, 1, [to disable LDAP])
        AC_SUBST(CURL_DISABLE_LDAP, [1])])
        AC_DEFINE(CURL_DISABLE_LDAPS, 1, [to disable LDAPS])
        AC_SUBST(CURL_DISABLE_LDAPS, [1])
    fi
  fi
fi

if test x$CURL_DISABLE_LDAP != x1 ; then
  AC_CHECK_FUNCS([ldap_url_parse])

  if test "$LDAPLIBNAME" = "wldap32"; then
    curl_ldap_msg="enabled (winldap)"
    AC_DEFINE(CURL_LDAP_WIN, 1, [Use W$ LDAP implementation])
    case $host in
      *-*-cygwin* | *-*-pw32*)
        AC_DEFINE(CURL_LDAP_HYBRID, 1, [W$ LDAP with non-W$ compiler])
        ;;
    esac
  else
    curl_ldap_msg="enabled (OpenLDAP)"
  fi
fi

dnl **********************************************************************
dnl Checks for IPv6
dnl **********************************************************************

AC_MSG_CHECKING([whether to enable ipv6])
AC_ARG_ENABLE(ipv6,
AC_HELP_STRING([--enable-ipv6],[Enable ipv6 (with ipv4) support])
AC_HELP_STRING([--disable-ipv6],[Disable ipv6 support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       ipv6=no
       ;;
  *)   AC_MSG_RESULT(yes)
       ipv6=yes
       ;;
  esac ],

  AC_TRY_RUN([ /* is AF_INET6 available? */
#include <sys/types.h>
#include <sys/socket.h>
main()
{
 if (socket(AF_INET6, SOCK_STREAM, 0) < 0)
   exit(1);
 else
   exit(0);
}
],
  AC_MSG_RESULT(yes)
  ipv6=yes,
  AC_MSG_RESULT(no)
  ipv6=no,
  AC_MSG_RESULT(no)
  ipv6=no
))

if test "$ipv6" = "yes"; then
  curl_ipv6_msg="enabled"
fi

dnl **********************************************************************
dnl Check how non-blocking sockets are set
dnl **********************************************************************
AC_ARG_ENABLE(nonblocking,
AC_HELP_STRING([--enable-nonblocking],[Enable detecting how to do it])
AC_HELP_STRING([--disable-nonblocking],[Disable non-blocking socket detection]),
[
  if test "$enableval" = "no" ; then
    AC_MSG_WARN([non-blocking sockets disabled])
    AC_DEFINE(HAVE_DISABLED_NONBLOCKING, 1,
    [to disable NON-BLOCKING connections])
  else
    CURL_CHECK_NONBLOCKING_SOCKET
  fi
],
[
  CURL_CHECK_NONBLOCKING_SOCKET
])

dnl **********************************************************************
dnl Check if the operating system allows programs to write to their own argv[]
dnl **********************************************************************

AC_MSG_CHECKING([if argv can be written to])
AC_CACHE_VAL(curl_cv_writable_argv, [
AC_RUN_IFELSE([[
int main(int argc, char ** argv) {
        argv[0][0] = ' ';
        return (argv[0][0] == ' ')?0:1;
}
        ]],
        curl_cv_writable_argv=yes,
        curl_cv_writable_argv=no,
        curl_cv_writable_argv=cross)
])
case $curl_cv_writable_argv in
yes)
        AC_DEFINE(HAVE_WRITABLE_ARGV, 1, [Define this symbol if your OS supports changing the contents of argv])
        AC_MSG_RESULT(yes)
        ;;
no)
        AC_MSG_RESULT(no)
        ;;
*)
        AC_MSG_RESULT(no)
        AC_MSG_WARN([the previous check could not be made default was used])
        ;;
esac

dnl **********************************************************************
dnl Check for the presence of Kerberos4 libraries and headers
dnl **********************************************************************

AC_ARG_WITH(krb4-includes,
AC_HELP_STRING([--with-krb4-includes=DIR],
               [Specify location of kerberos4 headers]),[
 CPPFLAGS="$CPPFLAGS -I$withval"
 KRB4INC="$withval"
 want_krb4=yes
 ])

AC_ARG_WITH(krb4-libs,
AC_HELP_STRING([--with-krb4-libs=DIR],[Specify location of kerberos4 libs]),[
 LDFLAGS="$LDFLAGS -L$withval"
 KRB4LIB="$withval"
 want_krb4=yes
 ])


OPT_KRB4=off
AC_ARG_WITH(krb4,dnl
AC_HELP_STRING([--with-krb4=DIR],[where to look for Kerberos4]),[
  OPT_KRB4="$withval"
  if test X"$OPT_KRB4" != Xno; then
    want_krb4="yes"
    if test X"$OPT_KRB4" != Xyes; then
      LDFLAGS="$LDFLAGS -L$OPT_KRB4/lib$libsuff"
      KRB4LIB="$OPT_KRB4/lib$libsuff"
      CPPFLAGS="$CPPFLAGS -I$OPT_KRB4/include"
      KRB4INC="$OPT_KRB4/include"
    fi
  fi
 ])

AC_MSG_CHECKING([if Kerberos4 support is requested])

if test "$want_krb4" = yes
then
  if test "$ipv6" = "yes"; then
    echo krb4 is not compatible with IPv6
    exit 1
  fi
  AC_MSG_RESULT(yes)

  dnl Check for & handle argument to --with-krb4

  AC_MSG_CHECKING(where to look for Kerberos4)
  if test X"$OPT_KRB4" = Xyes
  then
    AC_MSG_RESULT([defaults])
  else
    AC_MSG_RESULT([libs in $KRB4LIB, headers in $KRB4INC])
  fi

  dnl Check for DES library
  AC_CHECK_LIB(des, des_pcbc_encrypt,
  [
    AC_CHECK_HEADERS(des.h)

    dnl resolv lib?
    AC_CHECK_FUNC(res_search, , [AC_CHECK_LIB(resolv, res_search)])

    dnl Check for the Kerberos4 library
    AC_CHECK_LIB(krb, krb_net_read,
    [
      dnl Check for header files
      AC_CHECK_HEADERS(krb.h)

      dnl we found the required libraries, add to LIBS
      LIBS="-lkrb -lcom_err -ldes $LIBS"

      dnl Check for function krb_get_our_ip_for_realm
      dnl this is needed for NAT networks
      AC_CHECK_FUNCS(krb_get_our_ip_for_realm)

      dnl add define KRB4