GIF89a=( �' 7IAXKgNgYvYx\%wh&h}t�h%�s%x�}9�R��&�0%� (�.��5�SD��&�a)�x5��;ͣ*ȡ&ղ)ׯ7׵<ѻ4�3�H֧KͯT��Y�aq��q��F� !� ' !� NETSCAPE2.0 , =( ��pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g���E�������R���E����B�� ��ȸ��D���"�Ů� �H��L��D٫D�B�����D���T���H �G��A R�ڐ |�� ٭&��E8�S�kG�A�px�a��� R2XB��E8I���6X�:vT)�~��q�賥��"F~%x� � 4#Z�0O|-4Bs�X:= Q� Sal��yXJ`GȦ|s h��K3l7�B|�$'7Jީܪ0!��D�n=�P� ����0`�R�lj����v>���5 �.69�ϸd�����nlv�9��f{���Pbx �l5}�p� ��� �3a���I�O����!ܾ���i��9��#��)p�a ޽ �{�)vm��%D~ 6f��s}Œ�D�W E�`!� �&L8x� �ܝ{)x`X/>�}m��R�*|`D�=�_ ^�5 !_&'a�O�7�c��`DCx`�¥�9�Y�F���`?��"� �n@`�} lď��@4>�d S �v�xN��"@~d��=�g�s~G��� ���ud &p8Q�)ƫlXD����A~H�ySun�j���k*D�LH�] ��C"J��Xb~ʪwSt}6K,��q�S:9ت:���l�@�`�� �.۬�t9�S�[:��=`9N����{¿�A !R�:���6��x�0�_ �;������^���#����!����U���;0L1�����p% A��U̬ݵ��%�S��!���~`�G���� ���=4�np�3���������u�u�ٮ|%2�I��r�#0��J``8�@S@5� ���^`8E�]�.�S���7 � �0�j S�D� z���i�S�����!���l��w9*�D�I�nEX��� &A�Go�Qf��F��;���}�J����F5��Q|���X��T��y���]� o ��C=��:���PB@ D׽S�(>�C�x}`��xJЬ�۠��p+eE0`�}`A �/NE�� �9@��� H�7�!%B0`�l*��!8 2�%� �:�1�0E��ux%nP1�!�C)�P81l�ɸF#Ƭ{����B0>�� �b�`��O3��()yRpb��E.ZD8�H@% �Rx+%���c� ���f��b�d�`F�"8�XH"��-�|1�6iI, 2�$+](A*j� QT�o0.�U�`�R�}`�SN����yae�����b��o~ S)�y�@��3 �tT�0�&�+~L�f"�-|�~��>!�v��~�\Q1)}@�}h#aP72�"�$ !� " , =( &7IAXG]KgNgYvYxR"k\%w]'}h}t�h%�g+�s%r.m3ax3�x�}9��&��+�!7�0%� (�.�SD��&��;�"&ײ)׻4��6�K� �@pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g �� E �� �������E �´��C���ǶR��D��"Ʒ�ʱH��M��GڬD�B����D��T����G���C�C� l&�~:'�tU�6ɹ#��)�'�.6�&��Ȼ K(8p0N�?!�2"��NIJX>R��OM '��2�*x�>#n� �@<[:�I�f ��T���Cdb��[�}E�5MBo��@�`@��tW-3 �x�B���jI�&E�9[T&$��ﯧ&"s��ȳ����dc�UUρ#���ldj?����`\}���u|3'�R]�6 �S#�!�FKL�*N E���`$�:e�YD�q�.�촁�s \-�jA 9�����-��M[�x(�s��x�|���p��}k�T�DpE@W� ��]k`1� ���Yb ��0l��*n0��"~zBd�~u�7�0Bl��0-�x~|U�U0 �h�*HS�|��e"#"?vp�i`e6^�+q��`m8 #V�� ��VS|`��"m"сSn|@:U���~`pb�G�ED����2F�I�? >�x� R� ��%~jx��<�a�9ij�2�D��&: Z`�]w���:�6��B�7eFJ|�ҧ�,���FǮcS�ʶ+B�,�ܺN���>PAD�HD��~���n��}�#�� Q��S���2�X�{�k�lQ�2�����w�|2� h9��G�,m���3��6-��E�L��I�³*K���q�`DwV�QXS��peS��� qܧTS����R�u �<�a�*At�lmE� � ��N[P1�ۦ��$��@`��Dpy�yXvCAy�B`}D� 0QwG#� �a[^�� $���Ǧ{L�"[��K�g�;�S~��GX.�goT.��ư��x���?1z��x~:�g�|�L� ��S`��0S]P�^p F<""�?!,�!N4&P� ����:T�@h�9%t��:�-~�I<`�9p I&.)^ 40D#p@�j4�ج:�01��rܼF2oW�#Z ;$Q q  �K��Nl#29 !F@�Bh�ᏬL!XF�LHKh�.�hE&J�G��<"WN!�����Y@� >R~19J"�2,/ &.GXB%�R�9B6�W]���W�I�$��9�RE8Y� ��"�A5�Q.axB�&ة�J�! �t)K%tS-�JF b�NMxL��)�R��"���6O!TH�H� 0 !� ) , =( &AXKgNgYvYxR"k\%wh&h}h%�g+�s%r.x3�x�}9��&��+�R,�!7�0%� (�.��5��&�a)��;�"&ף*Ȳ)ׯ7׻4�3��6�H֧KͻH�T��Y��q��h� ��pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g �� E$����� � ����$E$��"��D� � ������R��C��� E ��H�M��G�D� �B��ϾD��a��`1r��Ӑ�� �o~�zU!L�C'�yW�UGt����ll�0���uG�)A�s[��x� �xO%��X2�  P�n:R/��aHae+�Dm?# ǣ6�8�J�x�Di�M���j���5oQ7�- <! *�l��R2r/a!l)d� A"�E���� &� ;��c �%����b��pe~C"B���H�eF2��`8qb�t_`ur`e� w�u3��Pv�h""�`�Íx�LĹ��3� �~ֺ�:���MDfJ� �۵�W�%�S�X �؁)�@��:E��w�u�Sxb8y\m�zS��Zb�E�L��w!y(>�"w�=�|��s�d �C�W)H�cC$�L �7r.�\{)@�`@ �X�$PD `aaG:���O�72E�amn]�"Rc�x�R� &dR8`g��i�xLR!�P &d����T���i�|�_ � Qi�#�`g:��:noM� :V �)p����W&a=�e�k� j���1߲s�x�W�jal|0��B0�, \j۴:6���C ��W��|��9���zĸV {�;��n��V�m�I��.��PN� ����C��+��By�ѾHŸ:��� 7�Y�FTk�SaoaY$D�S���29R�kt� ��f� ��:��Sp�3�I��DZ� �9���g��u�*3)O��[_hv ,���Et x�BH� �[��64M@�S�M7d�l�ܶ5-��U܍��z�R3Ԭ3~ ��P��5�g: ���kN�&0�j4���#{��3S�2�K�'ợl���2K{� {۶?~m𸧠�I�nE�='����^���_�=��~�#O���'���o..�Y�n��CSO��a��K��o,���b�����{�C�� "�{�K ��w��Ozdը�:$ ���v�] A#� ���a�z)Rx׿ƥ�d``�w-�y�f�K!����|��P��=�`�(f��'Pa ��BJa%��f�%`�}F����6>��`G"�}�=�!o`�^FP�ةQ�C���`(�}\�ݮ ��$<��n@dĠE#��U�I�!� #l��9`k���'Rr��Z�NB�MF �[�+9���-�wj���8�r� ,V�h"�|�S=�G_��"E� 0i*%̲��da0mVk�):;&6p>�jK ��# �D�:�c?:R Ӭf��I-�"�<�="��7�3S��c2RW ,�8(T"P0F¡Jh�" ; 403WebShell
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Current File : /usr/share/autoconf/autoconf/libs.m4
# This file is part of Autoconf.                       -*- Autoconf -*-
# Checking for libraries.
# Copyright (C) 1992-1996, 1998-2006, 2008-2012 Free Software
# Foundation, Inc.

# This file is part of Autoconf.  This program is free
# software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# Under Section 7 of GPL version 3, you are granted additional
# permissions described in the Autoconf Configure Script Exception,
# version 3.0, as published by the Free Software Foundation.
#
# You should have received a copy of the GNU General Public License
# and a copy of the Autoconf Configure Script Exception along with
# this program; see the files COPYINGv3 and COPYING.EXCEPTION
# respectively.  If not, see <http://www.gnu.org/licenses/>.

# Written by David MacKenzie, with help from
# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
# Roland McGrath, Noah Friedman, david d zuhn, and many others.

# Table of contents
#
# 1. Generic tests for libraries
# 2. Tests for specific libraries


## --------------------------------- ##
## 1. Generic tests for libraries.## ##
## --------------------------------- ##



# AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS,
#                [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#                [OTHER-LIBRARIES])
# --------------------------------------------------------
# Search for a library defining FUNC, if it's not already available.
AC_DEFUN([AC_SEARCH_LIBS],
[AS_VAR_PUSHDEF([ac_Search], [ac_cv_search_$1])dnl
AC_CACHE_CHECK([for library containing $1], [ac_Search],
[ac_func_search_save_LIBS=$LIBS
AC_LANG_CONFTEST([AC_LANG_CALL([], [$1])])
for ac_lib in '' $2; do
  if test -z "$ac_lib"; then
    ac_res="none required"
  else
    ac_res=-l$ac_lib
    LIBS="-l$ac_lib $5 $ac_func_search_save_LIBS"
  fi
  AC_LINK_IFELSE([], [AS_VAR_SET([ac_Search], [$ac_res])])
  AS_VAR_SET_IF([ac_Search], [break])
done
AS_VAR_SET_IF([ac_Search], , [AS_VAR_SET([ac_Search], [no])])
rm conftest.$ac_ext
LIBS=$ac_func_search_save_LIBS])
AS_VAR_COPY([ac_res], [ac_Search])
AS_IF([test "$ac_res" != no],
  [test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
  $3],
      [$4])
AS_VAR_POPDEF([ac_Search])dnl
])



# AC_CHECK_LIB(LIBRARY, FUNCTION,
#              [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#              [OTHER-LIBRARIES])
# ------------------------------------------------------
#
# Use a cache variable name containing both the library and function name,
# because the test really is for library $1 defining function $2, not
# just for library $1.  Separate tests with the same $1 and different $2s
# may have different results.
#
# Note that using directly AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])
# is asking for troubles, since AC_CHECK_LIB($lib, fun) would give
# ac_cv_lib_$lib_fun, which is definitely not what was meant.  Hence
# the AS_LITERAL_IF indirection.
#
# FIXME: This macro is extremely suspicious.  It DEFINEs unconditionally,
# whatever the FUNCTION, in addition to not being a *S macro.  Note
# that the cache does depend upon the function we are looking for.
#
# It is on purpose we used `ac_check_lib_save_LIBS' and not just
# `ac_save_LIBS': there are many macros which don't want to see `LIBS'
# changed but still want to use AC_CHECK_LIB, so they save `LIBS'.
# And ``ac_save_LIBS' is too tempting a name, so let's leave them some
# freedom.
AC_DEFUN([AC_CHECK_LIB],
[m4_ifval([$3], , [AH_CHECK_LIB([$1])])dnl
AS_LITERAL_WORD_IF([$1],
	      [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])],
	      [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1''_$2])])dnl
AC_CACHE_CHECK([for $2 in -l$1], [ac_Lib],
[ac_check_lib_save_LIBS=$LIBS
LIBS="-l$1 $5 $LIBS"
AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
	       [AS_VAR_SET([ac_Lib], [yes])],
	       [AS_VAR_SET([ac_Lib], [no])])
LIBS=$ac_check_lib_save_LIBS])
AS_VAR_IF([ac_Lib], [yes],
      [m4_default([$3], [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
  LIBS="-l$1 $LIBS"
])],
      [$4])
AS_VAR_POPDEF([ac_Lib])dnl
])# AC_CHECK_LIB


# AH_CHECK_LIB(LIBNAME)
# ---------------------
m4_define([AH_CHECK_LIB],
[AH_TEMPLATE(AS_TR_CPP([HAVE_LIB$1]),
	     [Define to 1 if you have the `$1' library (-l$1).])])


# AC_HAVE_LIBRARY(LIBRARY,
#                 [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#                 [OTHER-LIBRARIES])
# ---------------------------------------------------------
#
# This macro is equivalent to calling `AC_CHECK_LIB' with a FUNCTION
# argument of `main'.  In addition, LIBRARY can be written as any of
# `foo', `-lfoo', or `libfoo.a'.  In all of those cases, the compiler
# is passed `-lfoo'.  However, LIBRARY cannot be a shell variable;
# it must be a literal name.
AU_DEFUN([AC_HAVE_LIBRARY],
[m4_pushdef([AC_Lib_Name],
	    m4_bpatsubst(m4_bpatsubst([[$1]],
				    [lib\([^\.]*\)\.a], [\1]),
			[-l], []))dnl
AC_CHECK_LIB(AC_Lib_Name, main, [$2], [$3], [$4])dnl
ac_cv_lib_[]AC_Lib_Name()=ac_cv_lib_[]AC_Lib_Name()_main
m4_popdef([AC_Lib_Name])dnl
])




## --------------------------------- ##
## 2. Tests for specific libraries.  ##
## --------------------------------- ##



# --------------------- #
# Checks for X window.  #
# --------------------- #


# _AC_PATH_X_XMKMF
# ----------------
# Internal subroutine of _AC_PATH_X.
# Set ac_x_includes and/or ac_x_libraries.
m4_define([_AC_PATH_X_XMKMF],
[AC_ARG_VAR(XMKMF, [Path to xmkmf, Makefile generator for X Window System])dnl
rm -f -r conftest.dir
if mkdir conftest.dir; then
  cd conftest.dir
  cat >Imakefile <<'_ACEOF'
incroot:
	@echo incroot='${INCROOT}'
usrlibdir:
	@echo usrlibdir='${USRLIBDIR}'
libdir:
	@echo libdir='${LIBDIR}'
_ACEOF
  if (export CC; ${XMKMF-xmkmf}) >/dev/null 2>/dev/null && test -f Makefile; then
    # GNU make sometimes prints "make[1]: Entering ...", which would confuse us.
    for ac_var in incroot usrlibdir libdir; do
      eval "ac_im_$ac_var=\`\${MAKE-make} $ac_var 2>/dev/null | sed -n 's/^$ac_var=//p'\`"
    done
    # Open Windows xmkmf reportedly sets LIBDIR instead of USRLIBDIR.
    for ac_extension in a so sl dylib la dll; do
      if test ! -f "$ac_im_usrlibdir/libX11.$ac_extension" &&
	 test -f "$ac_im_libdir/libX11.$ac_extension"; then
	ac_im_usrlibdir=$ac_im_libdir; break
      fi
    done
    # Screen out bogus values from the imake configuration.  They are
    # bogus both because they are the default anyway, and because
    # using them would break gcc on systems where it needs fixed includes.
    case $ac_im_incroot in
	/usr/include) ac_x_includes= ;;
	*) test -f "$ac_im_incroot/X11/Xos.h" && ac_x_includes=$ac_im_incroot;;
    esac
    case $ac_im_usrlibdir in
	/usr/lib | /usr/lib64 | /lib | /lib64) ;;
	*) test -d "$ac_im_usrlibdir" && ac_x_libraries=$ac_im_usrlibdir ;;
    esac
  fi
  cd ..
  rm -f -r conftest.dir
fi
])# _AC_PATH_X_XMKMF


# _AC_PATH_X_DIRECT
# -----------------
# Internal subroutine of _AC_PATH_X.
# Set ac_x_includes and/or ac_x_libraries.
m4_define([_AC_PATH_X_DIRECT],
[# Standard set of common directories for X headers.
# Check X11 before X11Rn because it is often a symlink to the current release.
ac_x_header_dirs='
/usr/X11/include
/usr/X11R7/include
/usr/X11R6/include
/usr/X11R5/include
/usr/X11R4/include

/usr/include/X11
/usr/include/X11R7
/usr/include/X11R6
/usr/include/X11R5
/usr/include/X11R4

/usr/local/X11/include
/usr/local/X11R7/include
/usr/local/X11R6/include
/usr/local/X11R5/include
/usr/local/X11R4/include

/usr/local/include/X11
/usr/local/include/X11R7
/usr/local/include/X11R6
/usr/local/include/X11R5
/usr/local/include/X11R4

/usr/X386/include
/usr/x386/include
/usr/XFree86/include/X11

/usr/include
/usr/local/include
/usr/unsupported/include
/usr/athena/include
/usr/local/x11r5/include
/usr/lpp/Xamples/include

/usr/openwin/include
/usr/openwin/share/include'

if test "$ac_x_includes" = no; then
  # Guess where to find include files, by looking for Xlib.h.
  # First, try using that file with no special directory specified.
  AC_PREPROC_IFELSE([AC_LANG_SOURCE([@%:@include <X11/Xlib.h>])],
[# We can compile using X headers with no special include directory.
ac_x_includes=],
[for ac_dir in $ac_x_header_dirs; do
  if test -r "$ac_dir/X11/Xlib.h"; then
    ac_x_includes=$ac_dir
    break
  fi
done])
fi # $ac_x_includes = no

if test "$ac_x_libraries" = no; then
  # Check for the libraries.
  # See if we find them without any special options.
  # Don't add to $LIBS permanently.
  ac_save_LIBS=$LIBS
  LIBS="-lX11 $LIBS"
  AC_LINK_IFELSE([AC_LANG_PROGRAM([@%:@include <X11/Xlib.h>],
				  [XrmInitialize ()])],
		 [LIBS=$ac_save_LIBS
# We can link X programs with no special library path.
ac_x_libraries=],
		 [LIBS=$ac_save_LIBS
for ac_dir in `AS_ECHO(["$ac_x_includes $ac_x_header_dirs"]) | sed s/include/lib/g`
do
  # Don't even attempt the hair of trying to link an X program!
  for ac_extension in a so sl dylib la dll; do
    if test -r "$ac_dir/libX11.$ac_extension"; then
      ac_x_libraries=$ac_dir
      break 2
    fi
  done
done])
fi # $ac_x_libraries = no
])# _AC_PATH_X_DIRECT


# _AC_PATH_X
# ----------
# Compute ac_cv_have_x.
AC_DEFUN([_AC_PATH_X],
[AC_CACHE_VAL(ac_cv_have_x,
[# One or both of the vars are not set, and there is no cached value.
ac_x_includes=no ac_x_libraries=no
_AC_PATH_X_XMKMF
_AC_PATH_X_DIRECT
case $ac_x_includes,$ac_x_libraries in #(
  no,* | *,no | *\'*)
    # Didn't find X, or a directory has "'" in its name.
    ac_cv_have_x="have_x=no";; #(
  *)
    # Record where we found X for the cache.
    ac_cv_have_x="have_x=yes\
	ac_x_includes='$ac_x_includes'\
	ac_x_libraries='$ac_x_libraries'"
esac])dnl
])


# AC_PATH_X
# ---------
# If we find X, set shell vars x_includes and x_libraries to the
# paths, otherwise set no_x=yes.
# Uses ac_ vars as temps to allow command line to override cache and checks.
# --without-x overrides everything else, but does not touch the cache.
AN_HEADER([X11/Xlib.h],  [AC_PATH_X])
AC_DEFUN([AC_PATH_X],
[dnl Document the X abnormal options inherited from history.
m4_divert_once([HELP_BEGIN], [
X features:
  --x-includes=DIR    X include files are in DIR
  --x-libraries=DIR   X library files are in DIR])dnl
AC_MSG_CHECKING([for X])

AC_ARG_WITH(x, [  --with-x                use the X Window System])
# $have_x is `yes', `no', `disabled', or empty when we do not yet know.
if test "x$with_x" = xno; then
  # The user explicitly disabled X.
  have_x=disabled
else
  case $x_includes,$x_libraries in #(
    *\'*) AC_MSG_ERROR([cannot use X directory names containing ']);; #(
    *,NONE | NONE,*) _AC_PATH_X;; #(
    *) have_x=yes;;
  esac
  eval "$ac_cv_have_x"
fi # $with_x != no

if test "$have_x" != yes; then
  AC_MSG_RESULT([$have_x])
  no_x=yes
else
  # If each of the values was on the command line, it overrides each guess.
  test "x$x_includes" = xNONE && x_includes=$ac_x_includes
  test "x$x_libraries" = xNONE && x_libraries=$ac_x_libraries
  # Update the cache value to reflect the command line values.
  ac_cv_have_x="have_x=yes\
	ac_x_includes='$x_includes'\
	ac_x_libraries='$x_libraries'"
  AC_MSG_RESULT([libraries $x_libraries, headers $x_includes])
fi
])# AC_PATH_X



# AC_PATH_XTRA
# ------------
# Find additional X libraries, magic flags, etc.
AC_DEFUN([AC_PATH_XTRA],
[AC_REQUIRE([AC_PATH_X])dnl
if test "$no_x" = yes; then
  # Not all programs may use this symbol, but it does not hurt to define it.
  AC_DEFINE([X_DISPLAY_MISSING], 1,
	    [Define to 1 if the X Window System is missing or not being used.])
  X_CFLAGS= X_PRE_LIBS= X_LIBS= X_EXTRA_LIBS=
else
  if test -n "$x_includes"; then
    X_CFLAGS="$X_CFLAGS -I$x_includes"
  fi

  # It would also be nice to do this for all -L options, not just this one.
  if test -n "$x_libraries"; then
    X_LIBS="$X_LIBS -L$x_libraries"
    # For Solaris; some versions of Sun CC require a space after -R and
    # others require no space.  Words are not sufficient . . . .
    AC_MSG_CHECKING([whether -R must be followed by a space])
    ac_xsave_LIBS=$LIBS; LIBS="$LIBS -R$x_libraries"
    ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag=$ac_[]_AC_LANG_ABBREV[]_werror_flag
    ac_[]_AC_LANG_ABBREV[]_werror_flag=yes
    AC_LINK_IFELSE([AC_LANG_PROGRAM()],
      [AC_MSG_RESULT([no])
       X_LIBS="$X_LIBS -R$x_libraries"],
      [LIBS="$ac_xsave_LIBS -R $x_libraries"
       AC_LINK_IFELSE([AC_LANG_PROGRAM()],
	 [AC_MSG_RESULT([yes])
	  X_LIBS="$X_LIBS -R $x_libraries"],
	 [AC_MSG_RESULT([neither works])])])
    ac_[]_AC_LANG_ABBREV[]_werror_flag=$ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag
    LIBS=$ac_xsave_LIBS
  fi

  # Check for system-dependent libraries X programs must link with.
  # Do this before checking for the system-independent R6 libraries
  # (-lICE), since we may need -lsocket or whatever for X linking.

  if test "$ISC" = yes; then
    X_EXTRA_LIBS="$X_EXTRA_LIBS -lnsl_s -linet"
  else
    # Martyn Johnson says this is needed for Ultrix, if the X
    # libraries were built with DECnet support.  And Karl Berry says
    # the Alpha needs dnet_stub (dnet does not exist).
    ac_xsave_LIBS="$LIBS"; LIBS="$LIBS $X_LIBS -lX11"
    AC_LINK_IFELSE([AC_LANG_CALL([], [XOpenDisplay])],
		   [],
    [AC_CHECK_LIB(dnet, dnet_ntoa, [X_EXTRA_LIBS="$X_EXTRA_LIBS -ldnet"])
    if test $ac_cv_lib_dnet_dnet_ntoa = no; then
      AC_CHECK_LIB(dnet_stub, dnet_ntoa,
	[X_EXTRA_LIBS="$X_EXTRA_LIBS -ldnet_stub"])
    fi])
    LIBS="$ac_xsave_LIBS"

    # msh@cis.ufl.edu says -lnsl (and -lsocket) are needed for his 386/AT,
    # to get the SysV transport functions.
    # Chad R. Larson says the Pyramis MIS-ES running DC/OSx (SVR4)
    # needs -lnsl.
    # The nsl library prevents programs from opening the X display
    # on Irix 5.2, according to T.E. Dickey.
    # The functions gethostbyname, getservbyname, and inet_addr are
    # in -lbsd on LynxOS 3.0.1/i386, according to Lars Hecking.
    AC_CHECK_FUNC(gethostbyname)
    if test $ac_cv_func_gethostbyname = no; then
      AC_CHECK_LIB(nsl, gethostbyname, X_EXTRA_LIBS="$X_EXTRA_LIBS -lnsl")
      if test $ac_cv_lib_nsl_gethostbyname = no; then
	AC_CHECK_LIB(bsd, gethostbyname, X_EXTRA_LIBS="$X_EXTRA_LIBS -lbsd")
      fi
    fi

    # lieder@skyler.mavd.honeywell.com says without -lsocket,
    # socket/setsockopt and other routines are undefined under SCO ODT
    # 2.0.  But -lsocket is broken on IRIX 5.2 (and is not necessary
    # on later versions), says Simon Leinen: it contains gethostby*
    # variants that don't use the name server (or something).  -lsocket
    # must be given before -lnsl if both are needed.  We assume that
    # if connect needs -lnsl, so does gethostbyname.
    AC_CHECK_FUNC(connect)
    if test $ac_cv_func_connect = no; then
      AC_CHECK_LIB(socket, connect, X_EXTRA_LIBS="-lsocket $X_EXTRA_LIBS", ,
	$X_EXTRA_LIBS)
    fi

    # Guillermo Gomez says -lposix is necessary on A/UX.
    AC_CHECK_FUNC(remove)
    if test $ac_cv_func_remove = no; then
      AC_CHECK_LIB(posix, remove, X_EXTRA_LIBS="$X_EXTRA_LIBS -lposix")
    fi

    # BSDI BSD/OS 2.1 needs -lipc for XOpenDisplay.
    AC_CHECK_FUNC(shmat)
    if test $ac_cv_func_shmat = no; then
      AC_CHECK_LIB(ipc, shmat, X_EXTRA_LIBS="$X_EXTRA_LIBS -lipc")
    fi
  fi

  # Check for libraries that X11R6 Xt/Xaw programs need.
  ac_save_LDFLAGS=$LDFLAGS
  test -n "$x_libraries" && LDFLAGS="$LDFLAGS -L$x_libraries"
  # SM needs ICE to (dynamically) link under SunOS 4.x (so we have to
  # check for ICE first), but we must link in the order -lSM -lICE or
  # we get undefined symbols.  So assume we have SM if we have ICE.
  # These have to be linked with before -lX11, unlike the other
  # libraries we check for below, so use a different variable.
  # John Interrante, Karl Berry
  AC_CHECK_LIB(ICE, IceConnectionNumber,
    [X_PRE_LIBS="$X_PRE_LIBS -lSM -lICE"], , $X_EXTRA_LIBS)
  LDFLAGS=$ac_save_LDFLAGS

fi
AC_SUBST(X_CFLAGS)dnl
AC_SUBST(X_PRE_LIBS)dnl
AC_SUBST(X_LIBS)dnl
AC_SUBST(X_EXTRA_LIBS)dnl
])# AC_PATH_XTRA

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