configure.ac

dnl $Id$
dnl Process this file with autoconf to produce a configure script.

AC_PREREQ(2.57)

dnl We don't know the version number "staticly" so we use a dash here
AC_INIT(curl, [-], [curl-bug@haxx.se])

dnl configure script copyright
AC_COPYRIGHT([Copyright (c) 1998 - 2004 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
AC_PATH_PROG( 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

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 to 'no'
    curl_ssl_msg="no     (--with-ssl)"
   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)"

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 check for cygwin stuff
AC_LIBTOOL_WIN32_DLL

dnl libtool setup
AM_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])
case $host in
  *-*-solaris2*)
    if test "$GCC" = "yes"; then
      mimpure="yes"
    fi
    ;;
  *)
    mimpure=no
    ;;
esac
AC_MSG_RESULT($mimpure)
AM_CONDITIONAL(MIMPURE, test x$mimpure = xyes)

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

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 "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_HTTP, 1, [to disable HTTP])
       AC_MSG_WARN([disable HTTP disables FTP over proxy and GOPHER too])
       AC_DEFINE(CURL_DISABLE_GOPHER, 1, [to disable GOPHER])
       AC_SUBST(CURL_DISABLE_HTTP)
       AC_SUBST(CURL_DISABLE_GOPHER)
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)
AC_MSG_CHECKING([whether to support ftp])
AC_ARG_ENABLE(ftp,
AC_HELP_STRING([--enable-ftp],[Enable FTP support])
AC_HELP_STRING([--disable-ftp],[Disable FTP support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_FTP, 1, [to disable FTP])
       AC_SUBST(CURL_DISABLE_FTP)
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)
AC_MSG_CHECKING([whether to support gopher])
AC_ARG_ENABLE(gopher,
AC_HELP_STRING([--enable-gopher],[Enable GOPHER support])
AC_HELP_STRING([--disable-gopher],[Disable GOPHER support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_GOPHER, 1, [to disable GOPHER])
       AC_SUBST(CURL_DISABLE_GOPHER)
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)
AC_MSG_CHECKING([whether to support file])
AC_ARG_ENABLE(file,
AC_HELP_STRING([--enable-file],[Enable FILE support])
AC_HELP_STRING([--disable-file],[Disable FILE support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_FILE, 1, [to disable FILE])
       AC_SUBST(CURL_DISABLE_FILE)
       ;;
  *)   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 "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_LDAP, 1, [to disable LDAP])
       AC_SUBST(CURL_DISABLE_LDAP)
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)
AC_MSG_CHECKING([whether to support dict])
AC_ARG_ENABLE(dict,
AC_HELP_STRING([--enable-dict],[Enable DICT support])
AC_HELP_STRING([--disable-dict],[Disable DICT support]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_DICT, 1, [to disable DICT])
       AC_SUBST(CURL_DISABLE_DICT)
       ;;
  *)   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)
       ;;
  *)   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 "$HAVE_GETHOSTBYNAME" != "1"
then
  AC_MSG_CHECKING([trying gethostbyname with both nsl and socket libs])
  my_ac_save_LIBS=$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 $LIBS"
  AC_TRY_LINK([#include <winsock2.h>],
               [gethostbyname("www.dummysite.com");],
               [ dnl worked!
               AC_MSG_RESULT([yes])
               HAVE_GETHOSTBYNAME="1"],
               [ dnl failed, restore LIBS
               LIBS=$my_ac_save_LIBS
               AC_MSG_RESULT(no)]
             )
fi

if test "$HAVE_GETHOSTBYNAME" = "1"; then
  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 Check for the presence of the winmm library.
dnl **********************************************************************

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)]
           )

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"

  CURL_CHECK_WORKING_GETADDRINFO

  CURL_CHECK_NI_WITHSCOPEID
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 for the random seed preferences 
dnl **********************************************************************

AC_ARG_WITH(egd-socket,
AC_HELP_STRING([--with-egd-socket=FILE],
               [Entropy Gathering Daemon socket pathname]),
    [ EGD_SOCKET="$withval" ]
)
if test -n "$EGD_SOCKET" ; then
	AC_DEFINE_UNQUOTED(EGD_SOCKET, "$EGD_SOCKET",
        [your Entropy Gathering Daemon socket pathname] )
fi

dnl Check for user-specified random device
AC_ARG_WITH(random,
AC_HELP_STRING([--with-random=FILE],[read randomness from FILE (default=/dev/urandom)]),
    [ RANDOM_FILE="$withval" ],
    [
        dnl Check for random device
        AC_CHECK_FILE("/dev/urandom", [ RANDOM_FILE="/dev/urandom"] )
    ]
)
if test -n "$RANDOM_FILE" ; then
	AC_SUBST(RANDOM_FILE)
	AC_DEFINE_UNQUOTED(RANDOM_FILE, "$RANDOM_FILE",
        [a suitable file to read random data from])
fi

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" != 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
  want_krb4="yes"
 ])

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 -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="$withval"
    want_spnego="yes" ]
)
AC_MSG_CHECKING([if SPNEGO support is requested])
if test x"$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 **********************************************************************

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_LIBS="-L$withval -lgssapi"
    want_gss="yes" ]
)

AC_ARG_WITH(gssapi,
  AC_HELP_STRING([--with-gssapi=DIR],
                 [Where to look for GSSAPI]),
  [ GSSAPI_ROOT="$withval"
    want_gss="yes" ]
)

AC_MSG_CHECKING([if GSSAPI support is requested])
if test x"$want_gss" = xyes; then
  if test -z "$GSSAPI_INCS"; then
     if test -f "$GSSAPI_ROOT/bin/krb5-config"; then
        GSSAPI_INCS=`$GSSAPI_ROOT/bin/krb5-config --cflags gssapi`
     else
        GSSAPI_INCS="-I$GSSAPI_ROOT/include"
     fi
  fi
  CPPFLAGS="$CPPFLAGS $GSSAPI_INCS"
  
  if test -z "$GSSAPI_LIB_DIR"; then
     if test -f "$GSSAPI_ROOT/bin/krb5-config"; then
        gss_ldflags=`$GSSAPI_ROOT/bin/krb5-config --libs gssapi`
	LDFLAGS="$LDFLAGS $gss_ldflags"
     else
        LDFLAGS="$LDFLAGS -L$GSSAPI_ROOT/lib$libsuff -lgssapi"
     fi
  else
     LDFLAGS="$LDFLAGS $GSSAPI_LIB_DIR"
  fi

  AC_MSG_RESULT(yes)
  AC_DEFINE(HAVE_GSSAPI, 1, [if you have the gssapi libraries])

  curl_gss_msg="enabled"

  if test -n "$GSSAPI_INCS"; then
    # cut off the preceding -I from the include path
    GSSAPI_INCS=`echo $GSSAPI_INCS | sed -e s/^-I//g`
  fi

  if test -f "$GSSAPI_INCS/gssapi.h"; then
      AC_DEFINE(HAVE_GSSHEIMDAL, 1, [if you have the Heimdal gssapi libraries])
  else
      AC_DEFINE(HAVE_GSSMIT, 1, [if you have the MIT gssapi libraries])
  fi
  
else
  AC_MSG_RESULT(no)
fi
  
dnl **********************************************************************
dnl Check for the presence of SSL libraries and headers
dnl **********************************************************************

dnl Default to compiler & linker defaults for SSL files & libraries.
OPT_SSL=off
dnl Default to no CA bundle
ca="no"
AC_ARG_WITH(ssl,dnl
AC_HELP_STRING([--with-ssl=PATH],[where to look for SSL, PATH points to the SSL installation (default: /usr/local/ssl)])
AC_HELP_STRING([--without-ssl], [disable SSL]),
  OPT_SSL=$withval)

if test X"$OPT_SSL" = Xno
then
  AC_MSG_WARN([SSL disabled, you will not be able to use HTTPS, FTPS, NTLM and more])  
else

  dnl backup the pre-ssl variables
  CLEANLDFLAGS="$LDFLAGS"
  CLEANCPPFLAGS="$CPPFLAGS"
  CLEANLIBS="$LIBS"

  dnl Detect the pkg-config tool, as it may have extra info about the openssl
  dnl installation we can use. I *believe* this is what we are expected to do
  dnl on really recent Redhat Linux hosts.

  AC_PATH_PROG( PKGCONFIG, pkg-config, no, $PATH:/usr/bin:/usr/local/bin)
  if test "$PKGCONFIG" != "no" ; then
    AC_MSG_CHECKING([OpenSSL options with pkg-config])

    $PKGCONFIG --exists openssl
    SSL_EXISTS=$?

    if test "$SSL_EXISTS" -eq "0"; then
      SSL_LIBS=`$PKGCONFIG --libs-only-l openssl 2>/dev/null`
      SSL_LDFLAGS=`$PKGCONFIG --libs-only-L openssl 2>/dev/null`
      SSL_CPPFLAGS=`$PKGCONFIG --cflags-only-I openssl 2>/dev/null`

      dnl use the values pkg-config reported
      LIBS="$LIBS $SSL_LIBS"
      CPPFLAGS="$CPPFLAGS $SSL_CPPFLAGS"
      LDFLAGS="$LDFLAGS $SSL_LDFLAGS"
      AC_MSG_RESULT([found])
    else
      AC_MSG_RESULT([no])
    fi
  fi

  case "$OPT_SSL" in
  yes)
    EXTRA_SSL=/usr/local/ssl ;;
  off)
    EXTRA_SSL= ;;
  *)
    dnl check the given spot right away!
    EXTRA_SSL=$OPT_SSL
    LDFLAGS="$LDFLAGS -L$EXTRA_SSL/lib$libsuff"
    CPPFLAGS="$CPPFLAGS -I$EXTRA_SSL/include/openssl -I$EXTRA_SSL/include"
    ;;
  esac

  AC_CHECK_LIB(crypto, CRYPTO_lock,[
     HAVECRYPTO="yes"
     ],[
     LDFLAGS="$CLEANLDFLAGS -L$EXTRA_SSL/lib$libsuff"
     CPPFLAGS="$CLEANCPPFLAGS -I$EXTRA_SSL/include/openssl -I$EXTRA_SSL/include"
     AC_CHECK_LIB(crypto, CRYPTO_add_lock,[
       HAVECRYPTO="yes" ], [
       LDFLAGS="$CLEANLDFLAGS"
       CPPFLAGS="$CLEANCPPFLAGS"
       LIBS="$CLEANLIBS"
       ])
    ])


  if test "$HAVECRYPTO" = "yes"; then
    dnl This is only reasonable to do if crypto actually is there: check for
    dnl SSL libs NOTE: it is important to do this AFTER the crypto lib

    dnl This is for Msys/Mingw
    AC_MSG_CHECKING([for gdi32])
    my_ac_save_LIBS=$LIBS
    LIBS="-lgdi32 $LIBS"
    AC_TRY_LINK([#include <windef.h>
                 #include <wingdi.h>],
               [GdiFlush();],
               [ dnl worked!
               AC_MSG_RESULT([yes])],
               [ dnl failed, restore LIBS
               LIBS=$my_ac_save_LIBS
               AC_MSG_RESULT(no)]
              )

    AC_CHECK_LIB(crypto, CRYPTO_add_lock)
    AC_CHECK_LIB(ssl, SSL_connect)

    if test "$ac_cv_lib_ssl_SSL_connect" != yes; then
        dnl we didn't find the SSL lib, try the RSAglue/rsaref stuff
        AC_MSG_CHECKING(for ssl with RSAglue/rsaref libs in use);
        OLIBS=$LIBS
        LIBS="$LIBS -lRSAglue -lrsaref"
        AC_CHECK_LIB(ssl, SSL_connect)
        if test "$ac_cv_lib_ssl_SSL_connect" != yes; then
            dnl still no SSL_connect
            AC_MSG_RESULT(no)
            LIBS=$OLIBS
        else
            AC_MSG_RESULT(yes)
        fi
    fi


    dnl Check for SSLeay headers
    AC_CHECK_HEADERS(openssl/x509.h openssl/rsa.h openssl/crypto.h \
                     openssl/pem.h openssl/ssl.h openssl/err.h,
      curl_ssl_msg="enabled"
      OPENSSL_ENABLED=1)

    if test $ac_cv_header_openssl_x509_h = no; then
      AC_CHECK_HEADERS(x509.h rsa.h crypto.h pem.h ssl.h err.h,
        curl_ssl_msg="enabled"
        OPENSSL_ENABLED=1)
    fi

    dnl If the ENGINE library seems to be around, check for the OpenSSL engine
    dnl header, it is kind of "separated" from the main SSL check
    AC_CHECK_FUNC(ENGINE_init, [ AC_CHECK_HEADERS(openssl/engine.h) ])

    AC_SUBST(OPENSSL_ENABLED)

    AC_MSG_CHECKING([CA cert bundle install path])

    AC_ARG_WITH(ca-bundle,
AC_HELP_STRING([--with-ca-bundle=FILE], [File name to install the CA bundle as])
AC_HELP_STRING([--without-ca-bundle], [Don't install the CA bundle]),
    [ ca="$withval" ],
    [
      if test "x$prefix" != xNONE; then
        ca="\${prefix}/share/curl/curl-ca-bundle.crt"
      else
        ca="$ac_default_prefix/share/curl/curl-ca-bundle.crt"
      fi
    ] )

    if test X"$OPT_SSL" = Xno; then
      ca="no"
    fi

    if test "x$ca" != "xno"; then
      CURL_CA_BUNDLE='"'$ca'"'
      AC_SUBST(CURL_CA_BUNDLE)  
    fi
    AC_MSG_RESULT([$ca])

    dnl these can only exist if openssl exists

    AC_CHECK_FUNCS( RAND_status \
                    RAND_screen \
                    RAND_egd \
                    CRYPTO_cleanup_all_ex_data )

  fi

  if test X"$OPT_SSL" != Xoff &&
     test "$OPENSSL_ENABLED" != "1"; then
    AC_MSG_ERROR([OpenSSL libs and/or directories were not found where specified!])
  fi

fi

AM_CONDITIONAL(CABUNDLE, test x$ca != xno)

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

dnl Check for & handle argument to --with-zlib.

_cppflags=$CPPFLAGS
_ldflags=$LDFLAGS
OPT_ZLIB="/usr/local"
AC_ARG_WITH(zlib,
AC_HELP_STRING([--with-zlib=PATH],[search for zlib in PATH])
AC_HELP_STRING([--without-zlib],[disable use of zlib]),
               [OPT_ZLIB="$withval"])

case "$OPT_ZLIB" in
  no)
    AC_MSG_WARN([zlib disabled]) ;;
  *)
    dnl check for the lib first without setting any new path, since many
    dnl people have it in the default path

    AC_CHECK_LIB(z, inflateEnd,
                   dnl libz found, set the variable
                   [HAVE_LIBZ="1"],
                   dnl if no lib found, try to add the given library
                   [if test -d "$OPT_ZLIB"; then
                      CPPFLAGS="$CPPFLAGS -I$OPT_ZLIB/include"
                      LDFLAGS="$LDFLAGS -L$OPT_ZLIB/lib$libsuff"
                   fi])

    AC_CHECK_HEADER(zlib.h,
      [
      dnl zlib.h was found
      HAVE_ZLIB_H="1"
      dnl if the lib wasn't found already, try again with the new paths
      if test "$HAVE_LIBZ" != "1"; then
        AC_CHECK_LIB(z, gzread,
                     [
                     dnl the lib was found!
                     HAVE_LIBZ="1"
                     ],
                     [ CPPFLAGS=$_cppflags
                     LDFLAGS=$_ldflags])
      fi
      ],
      [
        dnl zlib.h was not found, restore the flags
        CPPFLAGS=$_cppflags
        LDFLAGS=$_ldflags]
      )

    if test "$HAVE_LIBZ" = "1" && test "$HAVE_ZLIB_H" != "1"
    then
      AC_MSG_WARN([configure found only the libz lib, not the header file!])
    elif test "$HAVE_LIBZ" != "1" && test "$HAVE_ZLIB_H" = "1"
    then
      AC_MSG_WARN([configure found only the libz header file, not the lib!])
    elif test "$HAVE_LIBZ" = "1" && test "$HAVE_ZLIB_H" = "1"
    then
      dnl both header and lib were found!
      AC_SUBST(HAVE_LIBZ)
      AC_DEFINE(HAVE_ZLIB_H, 1, [if you have the zlib.h header file])
      AC_DEFINE(HAVE_LIBZ, 1, [if zlib is available])

      LIBS="$LIBS -lz"

      dnl replace 'HAVE_LIBZ' in the automake makefile.ams
      AMFIXLIB="1"
      AC_MSG_NOTICE([found both libz and libz.h header])
      curl_zlib_msg="enabled"
    fi
    ;;
esac

dnl set variable for use in automakefile(s)
AM_CONDITIONAL(HAVE_LIBZ, test x"$AMFIXLIB" = x1)

AC_MSG_CHECKING([whether to build with libidn])
AC_ARG_WITH(libidn,
AC_HELP_STRING([--with-libidn=PATH],[Enable libidn usage])
AC_HELP_STRING([--without-libidn],[Disable libidn usage]),
  [LIBIDN="$withval"])

case "$LIBIDN" in
  no)
       AC_MSG_RESULT(no)
       ;;
  *)   AC_MSG_RESULT(yes)
       AC_CHECK_LIB(idn, idna_to_ascii_lz, ,
                    [
                    dnl if there was a given path, try it
                    nolibidn="true"
                    if test "x$LIBIDN" != "xyes"; then
                      nolibidn="" dnl reset to test again
                      oldLDFLAGS=$LDFLAGS
                      oldCPPFLAGS=$CPPFLAGS
                      LDFLAGS="$LDFLAGS -L$LIBIDN/lib"
                      CPPFLAGS="$CPPFLAGS -I$LIBIDN/include"
                      AC_CHECK_LIB(idn, idna_to_ascii_4i, ,
                                   nolibidn="true"
                                   AC_MSG_WARN([no libidn found in $LIBIDN])
                                   LDFLAGS=$oldLDFLAGS
                                   CPPFLAGS=$oldCPPFLAGS)
                    fi
                    ])
       if test "x$nolibidn" != "xtrue"; then
         curl_idn_msg="enabled"
       fi
                    
       ;; 
esac

dnl Default is to try the thread-safe versions of a few functions
OPT_THREAD=on

dnl detect AIX 4.3 or later
dnl see full docs on this reasoning in the lib/hostip.c source file
AC_MSG_CHECKING([AIX 4.3 or later])
AC_PREPROC_IFELSE([
#if defined(_AIX) && defined(_AIX43)
printf("just fine");
#else
#error "this is not AIX 4.3 or later"
#endif
],
 [ AC_MSG_RESULT([yes])
   RECENTAIX=yes
   OPT_THREAD=off ],
 [ AC_MSG_RESULT([no]) ]
)

AC_ARG_ENABLE(thread,dnl
AC_HELP_STRING([--disable-thread],[don't look for thread-safe functions])
AC_HELP_STRING([--enable-thread],[look for thread-safe functions]),
[ case "$enableval" in
  no)
    OPT_THREAD=off
    AC_MSG_WARN(libcurl will not get built using thread-safe functions)
    ;;
  *)
    ;;
  esac
]