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)
AM_MAINTAINER_MODE

dnl SED is needed by some of the tools
AC_PATH_PROG( SED, sed, sed-was-not-found-by-configure,
              $PATH:/usr/bin:/usr/local/bin)
AC_SUBST(SED)

if test "x$SED" = "xsed-was-not-found-by-configure"; then
  AC_MSG_WARN([sed was not found, this may ruin your chances to build fine])
fi

dnl AR is used by libtool, and try the odd Solaris path too
dnl we use AC_CHECK_TOOL since this should make a library for the target
dnl platform
AC_CHECK_TOOL(AR, ar,
              ar-was-not-found-by-configure,
              $PATH:/usr/bin:/usr/local/bin:/usr/ccs/bin)
AC_SUBST(AR)
if test "x$AR" = "xar-was-not-found-by-configure"; then
  AC_MSG_WARN([ar was not found, this may ruin your chances to build fine])
fi
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 Check for AIX weirdos
AC_AIX

dnl Checks for programs.
AC_PROG_CC

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
AC_MSG_CHECKING([if arch-OS host is AMD64-linux (to build static libraries with PIC)])
case $host in
  x86_64*linux*)
    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 $host in
  *-*-cygwin | *-*-mingw* | *-*-pw32*)
    need_no_undefined=yes
    ;;
  *)
    need_no_undefined=no
    ;;
esac
AC_MSG_RESULT($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 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_WINLDAP
CURL_CHECK_HEADER_WINBER

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

case $host in
  #
  x86_64*linux*)
    #
    dnl find out if icc is being used
    if test "z$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

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 check if this is the Intel ICC compiler, and if so make it stricter
dnl (convert warning 147 into an error) so that it properly can detect the
dnl gethostbyname_r() version
dnl **********************************************************************
CURL_DETECT_ICC([CFLAGS="$CFLAGS -we 147"])

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 Minix 3.1
  AC_MSG_CHECKING([for gethostbyname for Minix 3])
  AC_TRY_LINK([
/* Older Minix versions may need <net/gen/netdb.h> here instead */
#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 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 **********************************************************************
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(["$LDAPLIBNAME" is not an LDAP library: LDAP disabled])
      AC_DEFINE(CURL_DISABLE_LDAP, 1, [to disable LDAP])
      AC_SUBST(CURL_DISABLE_LDAP, [1])])
  else
    dnl Try to find the right ldap libraries for this system
    CURL_CHECK_LIBS_LDAP
    case X-"$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])
        ;;
    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])])
    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 Check for the presence of the winmm library.
dnl **********************************************************************

case $host in
  *-*-cygwin*)
    dnl Under Cygwin, winmm exists but is not needed as WIN32 is not #defined
    dnl and gettimeofday() will be used regardless of the outcome of this test.
    dnl Skip this test, otherwise -lwinmm will be needlessly added to LIBS
    dnl (and recorded as such in the .la file, potentially affecting downstream
    dnl clients of the library.)
    ;;
  *)
    AC_MSG_CHECKING([for timeGetTime in winmm])
    my_ac_save_LIBS=$LIBS
    LIBS="-lwinmm $LIBS"
    AC_TRY_LINK([#include <windef.h>
                 #include <mmsystem.h>
                 ],
                 [timeGetTime();],
                 [ dnl worked!
                 AC_MSG_RESULT([yes])
                 ],
                 [ dnl failed, restore LIBS
                 LIBS=$my_ac_save_LIBS
                 AC_MSG_RESULT(no)]
               )
    ;;
esac

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
      AC_DEFINE(HAVE_KRB4, 1,
      [if you have the Kerberos4 libraries (including -ldes)])

      dnl substitute it too!
      KRB4_ENABLED=1
      AC_SUBST(KRB4_ENABLED)

      curl_krb4_msg="enabled"

      dnl the krb4 stuff needs a strlcpy()
      AC_CHECK_FUNCS(strlcpy)

    ])
  ])
else
  AC_MSG_RESULT(no)
fi

dnl **********************************************************************
dnl Check for FBopenssl(SPNEGO) libraries
dnl **********************************************************************

AC_ARG_WITH(spnego,
  AC_HELP_STRING([--with-spnego=DIR],
                 [Specify location of SPNEGO library fbopenssl]), [
  SPNEGO_ROOT="$withval"
  if test x"$SPNEGO_ROOT" != xno; then
    want_spnego="yes"
  fi
])

AC_MSG_CHECKING([if SPNEGO support is requested])
if test x"$want_spnego" = xyes; then

  if test X"$SPNEGO_ROOT" = Xyes; then
     AC_MSG_ERROR([FBOpenSSL libs and/or directories were not found where specified!])
     AC_MSG_RESULT(no)
  else
     if test -z "$SPNEGO_LIB_DIR"; then
        LDFLAGS="$LDFLAGS -L$SPNEGO_ROOT -lfbopenssl"
     else
        LDFLAGS="$LDFLAGS $SPNEGO_LIB_DIR"
     fi

     AC_MSG_RESULT(yes)
     AC_DEFINE(HAVE_SPNEGO, 1,
               [Define this if you have the SPNEGO library fbopenssl])
     curl_spnego_msg="enabled"
  fi
else
  AC_MSG_RESULT(no)
fi

dnl **********************************************************************
dnl Check for GSS-API libraries
dnl **********************************************************************

dnl check for gss stuff in the /usr as default

GSSAPI_ROOT="/usr"
AC_ARG_WITH(gssapi-includes,
  AC_HELP_STRING([--with-gssapi-includes=DIR],
                 [Specify location of GSSAPI header]),
  [ GSSAPI_INCS="-I$withval"
    want_gss="yes" ]
)

AC_ARG_WITH(gssapi-libs,
  AC_HELP_STRING([--with-gssapi-libs=DIR],
                 [Specify location of GSSAPI libs]),
  [ GSSAPI_LIB_DIR="-L$withval"
    want_gss="yes" ]
)

AC_ARG_WITH(gssapi,
  AC_HELP_STRING([--with-gssapi=DIR],
                 [Where to look for GSSAPI]), [
  GSSAPI_ROOT="$withval"
  if test x"$GSSAPI_ROOT" != xno; then
    want_gss="yes"
    if test x"$GSSAPI_ROOT" = xyes; then
      dnl if yes, then use default root
      GSSAPI_ROOT="/usr"
    fi
  fi
])

save_CPPFLAGS="$CPPFLAGS"
AC_MSG_CHECKING([if GSSAPI support is requested])
if test x"$want_gss" = xyes; then
  AC_MSG_RESULT(yes)

  if test -z "$GSSAPI_INCS"; then
     if test -f "$GSSAPI_ROOT/bin/krb5-config"; then
        GSSAPI_INCS=`$GSSAPI_ROOT/bin/krb5-config --cflags gssapi`
        GSSAPI_LIBS=`$GSSAPI_ROOT/bin/krb5-config --libs gssapi`
     elif test "$GSSAPI_ROOT" != "yes"; then
        GSSAPI_INCS="-I$GSSAPI_ROOT/include"
        GSSAPI_LIBS="-lgssapi"
     fi
  fi

  CPPFLAGS="$CPPFLAGS $GSSAPI_INCS"
  LIBS="$LIBS $GSSAPI_LIBS"

  AC_CHECK_HEADER(gss.h,
    [
      dnl found in the given dirs
      AC_DEFINE(HAVE_GSSGNU, 1, [if you have the GNU gssapi libraries])
      gnu_gss=yes
    ],
    [
      dnl not found, check MIT
      AC_CHECK_HEADER(gssapi/gssapi.h,
        [
          dnl found in the given dirs
          AC_DEFINE(HAVE_GSSMIT, 1, [if you have the MIT gssapi libraries])
        ],
        [
          dnl not found, check for Heimdal
          AC_CHECK_HEADER(gssapi.h,
            [
              dnl found
              AC_DEFINE(HAVE_GSSHEIMDAL, 1, [if you have the Heimdal gssapi libraries])
            ],
            [
              dnl no header found, disabling GSS
              want_gss=no
              AC_MSG_WARN(disabling GSSAPI since no header files was found)
            ]
          )
        ]
      )