configure.ac

    else
       LIBS="$CLEANLIBS"
    fi
    dnl USE_SSLEAY is the historical name for what configure calls
    dnl OPENSSL_ENABLED; the names should really be unified
    USE_SSLEAY="$OPENSSL_ENABLED"
    AC_SUBST(USE_SSLEAY)

    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

  if test X"$OPENSSL_ENABLED" = X"1"; then
    dnl If the ENGINE library seems to be around, check for the OpenSSL engine
    dnl stuff, it is kind of "separated" from the main SSL check
    AC_CHECK_FUNC(ENGINE_init,
              [
                AC_CHECK_HEADERS(openssl/engine.h)
                AC_CHECK_FUNCS( ENGINE_load_builtin_engines )
              ])

    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 "$OPENSSL_ENABLED" = "1"; then
    if test -n "$LIB_OPENSSL"; then
       dnl when the ssl shared libs were found in a path that the run-time
       dnl linker doesn't search through, we need to add it to LD_LIBRARY_PATH
       dnl to prevent further configure tests to fail due to this

       LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$LIB_OPENSSL"
       export LD_LIBRARY_PATH
       AC_MSG_NOTICE([Added $LIB_OPENSSL to LD_LIBRARY_PATH])
    fi
  fi

fi

dnl **********************************************************************
dnl Check for the presence of LIBSSH2 libraries and headers
dnl **********************************************************************

dnl Default to compiler & linker defaults for LIBSSH2 files & libraries.
OPT_LIBSSH2=off
AC_ARG_WITH(libssh2,dnl
AC_HELP_STRING([--with-libssh2=PATH],[Where to look for libssh2, PATH points to the LIBSSH2 installation (default: /usr/local/lib); when possible, set the PKG_CONFIG_PATH environment variable instead of using this option])
AC_HELP_STRING([--without-libssh2], [disable LIBSSH2]),
  OPT_LIBSSH2=$withval)

if test X"$OPT_LIBSSH2" != Xno; then
  dnl backup the pre-libssh2 variables
  CLEANLDFLAGS="$LDFLAGS"
  CLEANCPPFLAGS="$CPPFLAGS"
  CLEANLIBS="$LIBS"

  case "$OPT_LIBSSH2" in
  yes)
    dnl --with-libssh2 (without path) used
    PREFIX_LIBSSH2=/usr/local/lib
    LIB_LIBSSH2="$PREFIX_LIBSSH2/lib$libsuff"
    ;;
  off)
    dnl no --with-libssh2 option given, just check default places
    PREFIX_LIBSSH2=
    ;;
  *)
    dnl check the given --with-libssh2 spot
    PREFIX_LIBSSH2=$OPT_LIBSSH2
    LIB_LIBSSH2="$PREFIX_LIBSSH2/lib$libsuff"
    LDFLAGS="$LDFLAGS -L$LIB_LIBSSH2"
    CPPFLAGS="$CPPFLAGS -I$PREFIX_LIBSSH2/include/libssh2 -I$PREFIX_LIBSSH2/include"
    ;;
  esac

  if test X"$HAVECRYPTO" = X"yes"; then
    dnl This is only reasonable to do if crypto actually is there: check for
    dnl LIBSSH2 libs NOTE: it is important to do this AFTER the crypto lib

    AC_CHECK_LIB(ssh2, libssh2_channel_open_ex)
    
    AC_CHECK_HEADERS(libssh2.h,
      curl_ssh_msg="enabled (libSSH2)"
      LIBSSH2_ENABLED=1
      AC_DEFINE(USE_LIBSSH2, 1, [if libSSH2 is in use]))

    if test X"$OPT_LIBSSH2" != Xoff &&
       test "$LIBSSH2_ENABLED" != "1"; then
      AC_MSG_ERROR([libSSH2 libs and/or directories were not found where specified!])
    fi
  fi

  if test "$LIBSSH2_ENABLED" = "1"; then
    if test -n "$LIB_LIBSSH2"; then
       dnl when the libssh2 shared libs were found in a path that the run-time
       dnl linker doesn't search through, we need to add it to LD_LIBRARY_PATH
       dnl to prevent further configure tests to fail due to this

       LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$LIB_LIBSSH2"
       export LD_LIBRARY_PATH
       AC_MSG_NOTICE([Added $LIB_LIBSSH2 to LD_LIBRARY_PATH])
    fi
  fi
fi

dnl **********************************************************************
dnl Check for the random seed preferences 
dnl **********************************************************************

if test X"$OPENSSL_ENABLED" = X"1"; then
  AC_ARG_WITH(egd-socket,
  AC_HELP_STRING([--with-egd-socket=FILE],
                 [Entropy Gathering Daemon socket pathname]),
      [ EGD_SOCKET="$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" && test X"$RANDOM_FILE" != Xno ; then
          AC_SUBST(RANDOM_FILE)
          AC_DEFINE_UNQUOTED(RANDOM_FILE, "$RANDOM_FILE",
          [a suitable file to read random data from])
  fi
fi

dnl ----------------------------------------------------
dnl FIX: only check for GnuTLS if OpenSSL is not enabled
dnl ----------------------------------------------------

dnl Default to compiler & linker defaults for GnuTLS files & libraries.
OPT_GNUTLS=no

AC_ARG_WITH(gnutls,dnl
AC_HELP_STRING([--with-gnutls=PATH],[where to look for GnuTLS, PATH points to the installation root (default: /usr/local/)])
AC_HELP_STRING([--without-gnutls], [disable GnuTLS detection]),
  OPT_GNUTLS=$withval)

if test "$OPENSSL_ENABLED" != "1"; then

  if test X"$OPT_GNUTLS" != Xno; then
    if test "x$OPT_GNUTLS" = "xyes"; then
     check=`libgnutls-config --version 2>/dev/null`
     if test -n "$check"; then
       addlib=`libgnutls-config --libs`
       addcflags=`libgnutls-config --cflags`
       version=`libgnutls-config --version`
       gtlsprefix=`libgnutls-config --prefix`
     fi
    else
      addlib=`$OPT_GNUTLS/bin/libgnutls-config --libs`
      addcflags=`$OPT_GNUTLS/bin/libgnutls-config --cflags`
      version=`$OPT_GNUTLS/bin/libgnutls-config --version 2>/dev/null`
      gtlsprefix=$OPT_GNUTLS
      if test -z "$version"; then
        version="unknown"
      fi
    fi
    if test -n "$addlib"; then

      CLEANLIBS="$LIBS"
      CLEANCPPFLAGS="$CPPFLAGS"
  
      LIBS="$LIBS $addlib"
      if test "$addcflags" != "-I/usr/include"; then
         CPPFLAGS="$CPPFLAGS $addcflags"
      fi
  
      AC_CHECK_LIB(gnutls, gnutls_check_version,
       [
       AC_DEFINE(USE_GNUTLS, 1, [if GnuTLS is enabled])
       AC_SUBST(USE_GNUTLS, [1])
       USE_GNUTLS="yes"
       curl_ssl_msg="enabled (GnuTLS)"
       ],
       [
         LIBS="$CLEANLIBS"
         CPPFLAGS="$CLEANCPPFLAGS"
       ])
  
      if test "x$USE_GNUTLS" = "xyes"; then
        AC_MSG_NOTICE([detected GnuTLS version $version])

        dnl when shared libs were found in a path that the run-time
        dnl linker doesn't search through, we need to add it to
        dnl LD_LIBRARY_PATH to prevent further configure tests to fail
        dnl due to this

        LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$gtlsprefix/lib$libsuff"
        export LD_LIBRARY_PATH
        AC_MSG_NOTICE([Added $gtlsprefix/lib$libsuff to LD_LIBRARY_PATH])
      fi

    fi

  fi dnl GNUTLS not disabled

  if test X"$USE_GNUTLS" != "Xyes"; then
    AC_MSG_WARN([SSL disabled, you will not be able to use HTTPS, FTPS, NTLM and more.])
    AC_MSG_WARN([Use --with-ssl or --with-gnutls to address this.])
  fi

fi dnl OPENSSL != 1

dnl **********************************************************************
dnl Check for the CA bundle
dnl **********************************************************************

if test X"$USE_GNUTLS$OPENSSL_ENABLED" != "X"; then

  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$ca" != "xno"; then
      CURL_CA_BUNDLE='"'$ca'"'
      AC_SUBST(CURL_CA_BUNDLE)  
    fi
    AC_MSG_RESULT([$ca])
fi dnl only done if some kind of SSL was enabled

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
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"])

if test "$OPT_ZLIB" = "no" ; then
    AC_MSG_WARN([zlib disabled])
else
  if test "$OPT_ZLIB" = "yes" ; then
     OPT_ZLIB=""
  fi

  if test -z "$OPT_ZLIB" ; then
    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 /usr/local
                   [OPT_ZLIB="/usr/local"])

  fi

  dnl Add a nonempty path to the compiler flags
  if test -n "$OPT_ZLIB"; then
     CPPFLAGS="$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
fi

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)

       idn=""
       dnl if there is a given path, check that FIRST
       if test -n "$LIBIDN"; then
         if test "x$LIBIDN" != "xyes"; then
            oldLDFLAGS=$LDFLAGS
            oldCPPFLAGS=$CPPFLAGS
            LDFLAGS="$LDFLAGS -L$LIBIDN/lib"
            CPPFLAGS="$CPPFLAGS -I$LIBIDN/include"
            idn="yes"
            AC_CHECK_LIB(idn, idna_to_ascii_4i, ,
                         idn=""
                         LDFLAGS=$oldLDFLAGS
                         CPPFLAGS=$oldCPPFLAGS)
         fi
       fi

       if test "x$idn" != "xyes"; then
          dnl check with default paths
          idn="yes"
          AC_CHECK_LIB(idn, idna_to_ascii_lz, ,
                       idn="")
       fi

       if test "x$idn" = "xyes"; then
         curl_idn_msg="enabled"
         AC_SUBST(IDN_ENABLED, [1])
         dnl different versions of libidn have different setups of these:
         AC_CHECK_FUNCS( idn_free idna_strerror tld_strerror)
         AC_CHECK_HEADERS( idn-free.h tld.h )
       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
]
)

if test X"$OPT_THREAD" = Xoff
then
  AC_DEFINE(DISABLED_THREADSAFE, 1,
    [Set to explicitly specify we don't want to use thread-safe functions])
else
  if test "$ipv6" != "yes"; then
    dnl dig around for gethostbyname_r()
    CURL_CHECK_GETHOSTBYNAME_R()

    dnl dig around for gethostbyaddr_r()
    dnl CURL_CHECK_GETHOSTBYADDR_R()
  fi

  dnl poke around for inet_ntoa_r()
  CURL_CHECK_INET_NTOA_R()

  dnl is there a localtime_r()
  CURL_CHECK_LOCALTIME_R()

  dnl is there a strerror_r()
  CURL_CHECK_STRERROR_R()

  checkfor_gmtime_r="yes"
fi

dnl for recent AIX versions, we skip all the thread-safe checks above since
dnl they claim a thread-safe libc using the standard API. But there are
dnl some functions still not thread-safe. Check for these!

dnl Let's hope this split URL remains working:
dnl http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/ \
dnl genprogc/thread_quick_ref.htm

if test "x$RECENTAIX" = "xyes"; then

  AC_DEFINE(_THREAD_SAFE, 1, [define this if you need it to compile thread-safe code])

  dnl check if this is the IMB xlc compiler
  dnl Details thanks to => http://predef.sourceforge.net/
  AC_MSG_CHECKING([if this is the xlc compiler])
  AC_EGREP_CPP([^__xlC__], [__xlC__],
         dnl action if the text is found, this it has not been replaced by the
         dnl cpp
         XLC="no"
         AC_MSG_RESULT([no]),
         dnl the text was not found, it was replaced by the cpp
         XLC="yes"
         AC_MSG_RESULT([yes])
         CFLAGS="$CFLAGS -qthreaded"
       )


  dnl is there a localtime_r()
  CURL_CHECK_LOCALTIME_R()

  dnl is there a strerror_r()
  CURL_CHECK_STRERROR_R()

  checkfor_gmtime_r="yes"
fi

if test x$cross_compiling != xyes; then

  if test x$checkfor_gmtime_r = xyes; then

    dnl if gmtime_r was found, verify that it actuall works, as (at least) HPUX
    dnl 10.20 is known to have a buggy one. If it doesn't work, disable use of
    dnl it.

    AC_MSG_CHECKING([if gmtime_r exists and works])
    AC_RUN_IFELSE([[
    #include <time.h>
    int main(void)
    {
    time_t local = 1170352587;
    struct tm *gmt;
    struct tm keeper;
    putenv("TZ=CST6CDT");
    tzset();
    gmt = gmtime_r(&local, &keeper);
    if(gmt) {
      return 0;
    }
    return 1; /* failure */
    }
     ]],
     dnl success, do nothing
     AC_MSG_RESULT(yes)
     AC_DEFINE(HAVE_GMTIME_R, 1, [if you have (a working) gmtime_r])
     ,
     dnl failure, now disable the function
     AC_MSG_RESULT(no)
    ,
    dnl not invoked when crosscompiling)
     echo "hej"
    )
  fi
else
  dnl and for crosscompilings
  AC_CHECK_FUNCS(gmtime_r)
fi


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

dnl Checks for header files.
AC_HEADER_STDC

CURL_CHECK_HEADER_MALLOC

dnl Now check for the very most basic headers. Then we can use these
dnl ones as default-headers when checking for the rest!
AC_CHECK_HEADERS(
        sys/types.h \
        sys/time.h \
        sys/select.h \
        sys/socket.h \
        sys/ioctl.h \
        assert.h \
        unistd.h \
        stdlib.h \
        limits.h \
        arpa/inet.h \
        net/if.h \
        netinet/in.h \
        netinet/tcp.h \
        netdb.h \
        sys/sockio.h \
        sys/stat.h \
        sys/param.h \
        termios.h \
        termio.h \
        sgtty.h \
        fcntl.h \
        dlfcn.h \
        alloca.h \
        time.h \
        io.h \
        pwd.h \
        utime.h \
        sys/utime.h \
        sys/poll.h \
        sys/resource.h \
        libgen.h \
        locale.h \
        errno.h \
        arpa/tftp.h \
        sys/filio.h \
        setjmp.h,
dnl to do if not found
[],
dnl to do if found
[],
dnl default includes
[
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
]
)

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

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

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

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


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

# Check for socklen_t or equivalent
CURL_CHECK_TYPE_SOCKLEN_T

TYPE_IN_ADDR_T

TYPE_SOCKADDR_STORAGE

AC_FUNC_SELECT_ARGTYPES

CURL_CHECK_FUNC_RECV

CURL_CHECK_FUNC_SEND

CURL_CHECK_MSG_NOSIGNAL

dnl Checks for library functions.
dnl AC_PROG_GCC_TRADITIONAL
AC_TYPE_SIGNAL
dnl AC_FUNC_VPRINTF
case $host in
  *msdosdjgpp)
     ac_cv_func_pipe=no
     skipcheck_pipe=yes
     AC_MSG_NOTICE([skip check for pipe on msdosdjgpp])
    ;;
esac
AC_CHECK_FUNCS( strtoll \
                socket \
                select \
                strdup \
                strstr \
                strtok_r \
                uname \
                strcasecmp \
                stricmp \
                strcmpi \
                gethostbyaddr \
                gettimeofday \
                inet_addr \
                inet_ntoa \
                inet_pton \
                perror \
                closesocket \
                siginterrupt \
                sigaction \
                signal \
                getpass_r \
                strlcat \
                getpwuid \
                geteuid \
                dlopen \
                utime \
                sigsetjmp \
                basename \
                setlocale \
                ftruncate \
                pipe \
                poll \
                getprotobyname \
                getrlimit \
                setrlimit \
                fork,
dnl if found
[],
dnl if not found, $ac_func is the name we check for
func="$ac_func"
eval skipcheck=\$skipcheck_$func
if test "x$skipcheck" != "xyes"; then
  AC_MSG_CHECKING([deeper for $func])
  AC_TRY_LINK( [],
               [ $func ();],
               AC_MSG_RESULT(yes!)
               eval "ac_cv_func_$func=yes"
               def=`echo "HAVE_$func" | tr 'a-z' 'A-Z'`
               AC_DEFINE_UNQUOTED($def, 1, [If you have $func]),
               AC_MSG_RESULT(but still no)
               )
fi
)

dnl For some reason, the check above doesn't properly detect select() with
dnl Msys/Mingw
if test "$ac_cv_func_select" = "no"; then
  AC_MSG_CHECKING([for select in ws2_32])
  AC_TRY_LINK([
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#else
#ifdef HAVE_WINSOCK_H
#include <winsock.h>
#endif
#endif
#endif
    ],[
      select(0,(fd_set *)NULL,(fd_set *)NULL,(fd_set *)NULL,(struct timeval *)NULL);
    ],[ 
      AC_MSG_RESULT([yes])
      HAVE_SELECT="1"
      AC_DEFINE_UNQUOTED(HAVE_SELECT, 1,
        [Define to 1 if you have the select function.])
    ],[
      AC_MSG_ERROR([You can't compile without a select])
  ])
fi

dnl sigsetjmp() might be a macro and no function so if it isn't found already
dnl we make an extra check here!
if test "$ac_cv_func_sigsetjmp" != "yes"; then
  AC_MSG_CHECKING([for sigsetjmp defined as macro])
  AC_TRY_LINK( [#include <setjmp.h>],
               [sigjmp_buf jmpenv;
                sigsetjmp(jmpenv, 1);],
               AC_MSG_RESULT(yes)
               AC_DEFINE(HAVE_SIGSETJMP, 1, [If you have sigsetjmp]),
               AC_MSG_RESULT(no)
               )
fi

AC_CHECK_DECL(basename, ,
              AC_DEFINE(NEED_BASENAME_PROTO, 1, [If you lack a fine basename() prototype]),
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_LIBGEN_H
#include <libgen.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
)

AC_CHECK_DECL(inet_pton, ,
              AC_DEFINE(HAVE_NO_INET_PTON_PROTO, 1,
                        [Defined if no inet_pton() prototype available]),
[
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
]
)

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

if test "$ipv6" = "yes"; then
  CURL_CHECK_WORKING_GETADDRINFO
  CURL_CHECK_NI_WITHSCOPEID
fi

AC_MSG_CHECKING([if we are Mac OS X (to disable poll)])
disable_poll=no
case $host in
  *-*-darwin*)
    disable_poll="yes";
    ;;
  *)
    ;;
esac
AC_MSG_RESULT($disable_poll)

if test "$disable_poll" = "no"; then

  dnl poll() might be badly emulated, as in Mac OS X 10.3 (and other BSDs?) and
  dnl to find out we make an extra check here!
  if test "$ac_cv_func_poll" = "yes"; then
    AC_MSG_CHECKING([if poll works with NULL inputs])
    AC_RUN_IFELSE([
#ifdef HAVE_SYS_POLL_H
#include <sys/poll.h>
#endif

  int main(void)
  {
    /* make this return 0 == timeout since there's nothing to read from */
    return poll((void *)0, 0, 10 /*ms*/);
  }
],
    AC_MSG_RESULT(yes)
    AC_DEFINE(HAVE_POLL_FINE, 1, [If you have a fine poll]),
    AC_MSG_RESULT(no),
    AC_MSG_RESULT(cross-compiling assumes yes)
    AC_DEFINE(HAVE_POLL_FINE, 1, [If you have a fine poll])
    ) dnl end of AC_RUN_IFELSE
  fi dnl poll() was found
fi dnl poll()-check is not disabled


AC_PATH_PROG( PERL, perl, , 
  $PATH:/usr/local/bin/perl:/usr/bin/:/usr/local/bin )
AC_SUBST(PERL)

AC_PATH_PROGS( NROFF, gnroff nroff, , 
  $PATH:/usr/bin/:/usr/local/bin )
AC_SUBST(NROFF)

if test -n "$NROFF"; then
  dnl only check for nroff options if an nroff command was found

  AC_MSG_CHECKING([how to use *nroff to get plain text from man pages])
  MANOPT="-man"
  mancheck=`echo foo | $NROFF $MANOPT 2>/dev/null`
  if test -z "$mancheck"; then
    MANOPT="-mandoc"
   mancheck=`echo foo | $NROFF $MANOPT 2>/dev/null`
    if test -z "$mancheck"; then
      MANOPT=""
      AC_MSG_RESULT([failed])
      AC_MSG_WARN([found no *nroff option to get plaintext from man pages])
    else
      AC_MSG_RESULT([$MANOPT])
    fi
  else
    AC_MSG_RESULT([$MANOPT])
  fi
  AC_SUBST(MANOPT)
fi

if test -z "$MANOPT"
then
  dnl if no nroff tool was found, or no option that could convert man pages
  dnl was found, then disable the built-in manual stuff
  AC_MSG_WARN([disabling built-in manual])
  USE_MANUAL="no";
fi

dnl *************************************************************************
dnl If the manual variable still is set, then we go with providing a built-in
dnl manual

if test "$USE_MANUAL" = "1"; then
  AC_DEFINE(USE_MANUAL, 1, [If you want to build curl with the built-in manual])
  curl_manual_msg="enabled"
fi

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

AC_MSG_CHECKING([whether to enable ares])
AC_ARG_ENABLE(ares,
AC_HELP_STRING([--enable-ares=PATH],[Enable ares for name lookups])
AC_HELP_STRING([--disable-ares],[Disable ares for name lookups]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       ;;
  *)   AC_MSG_RESULT(yes)

       if test "x$IPV6_ENABLED" = "x1"; then
         AC_MSG_NOTICE([ares may not work properly with ipv6])
       fi

       AC_DEFINE(USE_ARES, 1, [Define if you want to enable ares support])
       dnl substitute HAVE_ARES for curl-config and similar
       HAVE_ARES="1"
       AC_SUBST(HAVE_ARES)
       curl_ares_msg="enabled"

       LIBS="-lcares $LIBS"

       dnl For backwards compatibility default to includes/lib in srcdir/ares
       dnl If a value is specified it is assumed that the libs are in $val/lib
       dnl and the includes are in $val/include. This is the default setup for
       dnl ares so it should not be a problem.
       if test "x$enableval" = "xyes" ; then
         if test -d "$srcdir/ares"; then
            aresembedded="yes"
            AC_CONFIG_SUBDIRS(ares)
            aresinc=`cd $srcdir/ares && pwd`
            CPPFLAGS="$CPPFLAGS -I$aresinc"

            dnl the pwd= below cannot 'cd' into the ares dir to get the full
            dnl path to it, since it may not exist yet if we build outside of
            dnl the source tree
            pwd=`pwd`
            LDFLAGS="$LDFLAGS -L$pwd/ares"
         fi
       else
         CPPFLAGS="$CPPFLAGS -I$enableval/include"
         LDFLAGS="$LDFLAGS -L$enableval/lib"
       fi

       if test -z "$aresembedded"; then
         dnl verify that a sufficient c-ares is here if we have pointed one
         dnl out and don't use the "embedded" ares dir (in which case we don't
         dnl check it because it might not have been built yet)
         AC_MSG_CHECKING([that c-ares is good and recent enough])
         AC_LINK_IFELSE( [
#include <ares.h>
/* provide a set of dummy functions in case c-ares was built with debug */
void curl_dofree() { }
void curl_sclose() { }
void curl_domalloc() { }

int main(void)
{
  ares_channel channel;
  ares_cancel(channel);
  return 0;
}
],
          AC_MSG_RESULT(yes),
          AC_MSG_RESULT(no)
          AC_MSG_ERROR([c-ares library defective or too old])
          )
       fi
       ;;
  esac ],
       AC_MSG_RESULT(no)
)

dnl ************************************************************
dnl disable verbose text strings
dnl
AC_MSG_CHECKING([whether to enable verbose strings])
AC_ARG_ENABLE(verbose,
AC_HELP_STRING([--enable-verbose],[Enable verbose strings])
AC_HELP_STRING([--disable-verbose],[Disable verbose strings]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       AC_DEFINE(CURL_DISABLE_VERBOSE_STRINGS, 1, [to disable verbose strings])
       AC_SUBST(CURL_DISABLE_VERBOSE_STRINGS)
       curl_verbose_msg="no"
       ;;
  *)   AC_MSG_RESULT(yes)
       ;;
  esac ],
       AC_MSG_RESULT(yes)
)

dnl ************************************************************
dnl enable SSPI support
dnl
AC_MSG_CHECKING([whether to enable SSPI support (win32 builds only)])
AC_ARG_ENABLE(sspi,
AC_HELP_STRING([--enable-sspi],[Enable SSPI])
AC_HELP_STRING([--disable-sspi],[Disable SSPI]),
[ case "$enableval" in
  yes)
       AC_MSG_RESULT(yes)
       AC_DEFINE(USE_WINDOWS_SSPI, 1, [to enable SSPI support])
       AC_SUBST(USE_WINDOWS_SSPI)
       curl_sspi_msg="yes"
       ;;
  *)
       AC_MSG_RESULT(no)
       ;;
  esac ],
       AC_MSG_RESULT(no)
)

dnl ************************************************************
dnl lame option to switch on debug options
dnl
AC_MSG_CHECKING([whether to enable debug options])
AC_ARG_ENABLE(debug,
AC_HELP_STRING([--enable-debug],[Enable pedantic debug options])
AC_HELP_STRING([--disable-debug],[Disable debug options]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       ;;
  *)   AC_MSG_RESULT(yes)

    CPPFLAGS="$CPPFLAGS -DCURLDEBUG"
    CFLAGS="$CFLAGS -g"