m4/ltdl.m4 - quagga - Gitiles

 ## ltdl.m4 - Configure ltdl for the target system. -*-Autoconf-*-
 ## Copyright (C) 1999-2004 Free Software Foundation, Inc.
 ##
 ## 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 2 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.
 ##
 ## You should have received a copy of the GNU General Public License
 ## along with this program; if not, write to the Free Software
 ## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 ##
 ## As a special exception to the GNU General Public License, if you
 ## distribute this file as part of a program that contains a
 ## configuration script generated by Autoconf, you may include it under
 ## the same distribution terms that you use for the rest of that program.

 # serial 6 AC_LIB_LTDL

 # AC_WITH_LTDL([DIRECTORY])
 # -------------------------
 # Clients of libltdl can use this macro to allow the installer to
 # choose between a shipped copy of the ltdl sources or a preinstalled
 # version of the library.
 AC_DEFUN([AC_WITH_LTDL],
 [AC_ARG_WITH([included_ltdl],
     [AC_HELP_STRING([--with-included-ltdl],
                     [use the GNU ltdl sources included here])])

 if test "x$with_included_ltdl" != xyes; then
   # We are not being forced to use the included libltdl sources, so
   # decide whether there is a useful installed version we can use.
   AC_CHECK_HEADER([ltdl.h],
       [AC_CHECK_LIB([ltdl], [lt_dlcaller_register],
           [with_included_ltdl=no],
           [with_included_ltdl=yes])],

       [],
       [AC_INCLUDES_DEFAULT]
   )
 fi

 if test "x$enable_ltdl_install" != xyes; then
   # If the user did not specify an installable libltdl, then default
   # to a convenience lib.
   AC_LIBLTDL_CONVENIENCE
 fi

 if test "x$with_included_ltdl" = xno; then
   # If the included ltdl is not to be used. then Use the
   # preinstalled libltdl we found.
   AC_DEFINE([HAVE_LTDL], 1,
     [Define this if a modern libltdl is already installed])
   LIBLTDL=-lltdl
 fi

 # Report our decision...
 AC_MSG_CHECKING([whether to use included libltdl])
 AC_MSG_RESULT([$with_included_ltdl])

 AC_CONFIG_SUBDIRS(m4_if($#, 1, [$1], [libltdl]))
 ])# AC_WITH_LTDL


 # AC_LIBLTDL_CONVENIENCE([DIRECTORY])
 # -----------------------------------
 # sets LIBLTDL to the link flags for the libltdl convenience library and
 # LTDLINCL to the include flags for the libltdl header and adds
 # --enable-ltdl-convenience to the configure arguments.  Note that LIBLTDL
 # and LTDLINCL are not AC_SUBSTed, nor is AC_CONFIG_SUBDIRS called.  If
 # DIRECTORY is not provided, it is assumed to be `libltdl'.  LIBLTDL will
 # be prefixed with '${top_builddir}/' and LTDLINCL will be prefixed with
 # '${top_srcdir}/' (note the single quotes!).  If your package is not
 # flat and you're not using automake, define top_builddir and
 # top_srcdir appropriately in the Makefiles.
 AC_DEFUN([AC_LIBLTDL_CONVENIENCE],
 [case $enable_ltdl_convenience in
   no) AC_MSG_ERROR([this package needs a convenience libltdl]) ;;
   "") enable_ltdl_convenience=yes
       ac_configure_args="$ac_configure_args --enable-ltdl-convenience" ;;
   esac
 LIBLTDL='${top_builddir}/'m4_if($#, 1, [$1], ['libltdl'])/libltdlc.la
 LTDLINCL='-I${top_srcdir}/'m4_if($#, 1, [$1], ['libltdl'])

 AC_SUBST([LIBLTDL])
 AC_SUBST([LTDLINCL])

 # For backwards non-gettext consistent compatibility...
 INCLTDL="$LTDLINCL"
 AC_SUBST([INCLTDL])
 ])# AC_LIBLTDL_CONVENIENCE


 # AC_LIBLTDL_INSTALLABLE([DIRECTORY])
 # -----------------------------------
 # sets LIBLTDL to the link flags for the libltdl installable library and
 # LTDLINCL to the include flags for the libltdl header and adds
 # --enable-ltdl-install to the configure arguments.  Note that LIBLTDL
 # and LTDLINCL are not AC_SUBSTed, nor is AC_CONFIG_SUBDIRS called.  If
 # DIRECTORY is not provided and an installed libltdl is not found, it is
 # assumed to be `libltdl'.  LIBLTDL will be prefixed with '${top_builddir}/'
 # and LTDLINCL will be prefixed with '${top_srcdir}/' (note the single
 # quotes!).  If your package is not flat and you're not using automake,
 # define top_builddir and top_srcdir appropriately in the Makefiles.
 # In the future, this macro may have to be called after LT_INIT.
 AC_DEFUN([AC_LIBLTDL_INSTALLABLE],
 [AC_CHECK_LIB(ltdl, lt_dlinit,
   [test x"$enable_ltdl_install" != xyes && enable_ltdl_install=no],
   [if test x"$enable_ltdl_install" = xno; then
      AC_MSG_WARN([libltdl not installed, but installation disabled])
    else
      enable_ltdl_install=yes
    fi
   ])
 if test x"$enable_ltdl_install" = x"yes"; then
   ac_configure_args="$ac_configure_args --enable-ltdl-install"
   LIBLTDL='${top_builddir}/'m4_if($#, 1, [$1], ['libltdl'])/libltdl.la
   LTDLINCL='-I${top_srcdir}/'m4_if($#, 1, [$1], ['libltdl'])
 else
   ac_configure_args="$ac_configure_args --enable-ltdl-install=no"
   LIBLTDL="-lltdl"
   LTDLINCL=
 fi

 AC_SUBST([LIBLTDL])
 AC_SUBST([LTDLINCL])

 # For backwards non-gettext consistent compatibility...
 INCLTDL="$LTDLINCL"
 AC_SUBST([INCLTDL])
 ])# AC_LIBLTDL_INSTALLABLE


 # AC_LIB_LTDL
 # -----------
 # Perform all the checks necessary for compilation of the ltdl objects
 #  -- including compiler checks and header checks.
 AC_DEFUN([AC_LIB_LTDL],
 [AC_REQUIRE([AC_PROG_CC])
 AC_REQUIRE([AC_C_CONST])
 AC_REQUIRE([AC_HEADER_STDC])
 AC_REQUIRE([AC_HEADER_DIRENT])
 AC_REQUIRE([_LT_AC_CHECK_DLFCN])
 AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])
 AC_REQUIRE([AC_LTDL_SHLIBEXT])
 AC_REQUIRE([AC_LTDL_SHLIBPATH])
 AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])
 AC_REQUIRE([AC_LTDL_OBJDIR])
 AC_REQUIRE([AC_LTDL_DLPREOPEN])
 AC_REQUIRE([AC_LTDL_DLLIB])
 AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
 AC_REQUIRE([AC_LTDL_DLSYM_USCORE])
 AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])
 AC_REQUIRE([gl_FUNC_ARGZ])

 # In order that ltdl.c can compile, run AC_CONFIG_HEADERS for the user
 # if they did not call it themself.  This is so that ltdl.h can pick up
 # the parent projects config.h file, The first file in AC_CONFIG_HEADERS
 # must contain the definitions required by ltdl.c.
 m4_ifset([AC_LIST_HEADERS],
     [CONFIG_H=`echo "AC_LIST_HEADERS" | $SED 's,^[[ 	]]*,,;s,[[ :]].*$,,'`],
   [CONFIG_H=config.h;AC_CONFIG_HEADERS([config.h])])
 AC_SUBST([CONFIG_H])

 AC_CHECK_HEADERS([memory.h unistd.h dl.h sys/dl.h dld.h mach-o/dyld.h],
 	[], [], [AC_INCLUDES_DEFAULT])
 AC_CHECK_HEADERS([string.h strings.h], [break], [], [AC_INCLUDES_DEFAULT])

 AC_CHECK_FUNCS([closedir opendir readdir], [], [AC_LIBOBJ([lt__dirent])])
 ])# AC_LIB_LTDL


 # AC_LTDL_ENABLE_INSTALL
 # ----------------------
 AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
 [AC_ARG_ENABLE([ltdl-install],
     [AC_HELP_STRING([--enable-ltdl-install], [install libltdl])])

 AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno)
 AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno)
 ])])# AC_LTDL_ENABLE_INSTALL


 # AC_LTDL_SYS_DLOPEN_DEPLIBS
 # --------------------------
 AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS],
 [AC_REQUIRE([AC_CANONICAL_HOST])
 AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
   [libltdl_cv_sys_dlopen_deplibs],
   [# PORTME does your system automatically load deplibs for dlopen?
   # or its logical equivalent (e.g. shl_load for HP-UX < 11)
   # For now, we just catch OSes we know something about -- in the
   # future, we'll try test this programmatically.
   libltdl_cv_sys_dlopen_deplibs=unknown
   case "$host_os" in
   aix3*|aix4.1.*|aix4.2.*)
     # Unknown whether this is true for these versions of AIX, but
     # we want this `case' here to explicitly catch those versions.
     libltdl_cv_sys_dlopen_deplibs=unknown
     ;;
   aix[[45]]*)
     libltdl_cv_sys_dlopen_deplibs=yes
     ;;
   darwin*)
     # Assuming the user has installed a libdl from somewhere, this is true
     # If you are looking for one http://www.opendarwin.org/projects/dlcompat
     libltdl_cv_sys_dlopen_deplibs=yes
     ;;
   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
     # GNU and its variants, using gnu ld.so (Glibc)
     libltdl_cv_sys_dlopen_deplibs=yes
     ;;
   hpux10*|hpux11*)
     libltdl_cv_sys_dlopen_deplibs=yes
     ;;
   irix[[12345]]*|irix6.[[01]]*)
     # Catch all versions of IRIX before 6.2, and indicate that we don't
     # know how it worked for any of those versions.
     libltdl_cv_sys_dlopen_deplibs=unknown
     ;;
   irix*)
     # The case above catches anything before 6.2, and it's known that
     # at 6.2 and later dlopen does load deplibs.
     libltdl_cv_sys_dlopen_deplibs=yes
     ;;
   netbsd*)
     libltdl_cv_sys_dlopen_deplibs=yes
     ;;
   openbsd*)
     libltdl_cv_sys_dlopen_deplibs=yes
     ;;
   osf[[1234]]*)
     # dlopen did load deplibs (at least at 4.x), but until the 5.x series,
     # it did *not* use an RPATH in a shared library to find objects the
     # library depends on, so we explictly say `no'.
     libltdl_cv_sys_dlopen_deplibs=no
     ;;
   osf5.0|osf5.0a|osf5.1)
     # dlopen *does* load deplibs and with the right loader patch applied
     # it even uses RPATH in a shared library to search for shared objects
     # that the library depends on, but there's no easy way to know if that
     # patch is installed.  Since this is the case, all we can really
     # say is unknown -- it depends on the patch being installed.  If
     # it is, this changes to `yes'.  Without it, it would be `no'.
     libltdl_cv_sys_dlopen_deplibs=unknown
     ;;
   osf*)
     # the two cases above should catch all versions of osf <= 5.1.  Read
     # the comments above for what we know about them.
     # At > 5.1, deplibs are loaded *and* any RPATH in a shared library
     # is used to find them so we can finally say `yes'.
     libltdl_cv_sys_dlopen_deplibs=yes
     ;;
   qnx*)
     libltdl_cv_sys_dlopen_deplibs=yes
     ;;
   solaris*)
     libltdl_cv_sys_dlopen_deplibs=yes
     ;;
   esac
   ])
 if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
  AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1],
     [Define if the OS needs help to load dependent libraries for dlopen().])
 fi
 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS


 # AC_LTDL_SHLIBEXT
 # ----------------
 AC_DEFUN([AC_LTDL_SHLIBEXT],
 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
 AC_CACHE_CHECK([which extension is used for loadable modules],
   [libltdl_cv_shlibext],
 [
 module=yes
 eval libltdl_cv_shlibext=$shrext_cmds
   ])
 if test -n "$libltdl_cv_shlibext"; then
   AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",
     [Define to the extension used for shared libraries, say, ".so".])
 fi
 ])# AC_LTDL_SHLIBEXT


 # AC_LTDL_SHLIBPATH
 # -----------------
 AC_DEFUN([AC_LTDL_SHLIBPATH],
 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
 AC_CACHE_CHECK([which variable specifies run-time library path],
   [libltdl_cv_shlibpath_var], [libltdl_cv_shlibpath_var="$shlibpath_var"])
 if test -n "$libltdl_cv_shlibpath_var"; then
   AC_DEFINE_UNQUOTED(LTDL_SHLIBPATH_VAR, "$libltdl_cv_shlibpath_var",
     [Define to the name of the environment variable that determines the dynamic library search path.])
 fi
 ])# AC_LTDL_SHLIBPATH


 # AC_LTDL_SYSSEARCHPATH
 # ---------------------
 AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
 AC_CACHE_CHECK([for the default library search path],
   [libltdl_cv_sys_search_path],
   [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
 if test -n "$libltdl_cv_sys_search_path"; then
   sys_search_path=
   for dir in $libltdl_cv_sys_search_path; do
     if test -z "$sys_search_path"; then
       sys_search_path="$dir"
     else
       sys_search_path="$sys_search_path$PATH_SEPARATOR$dir"
     fi
   done
   AC_DEFINE_UNQUOTED(LTDL_SYSSEARCHPATH, "$sys_search_path",
     [Define to the system default library search path.])
 fi
 ])# AC_LTDL_SYSSEARCHPATH


 # AC_LTDL_OBJDIR
 # --------------
 AC_DEFUN([AC_LTDL_OBJDIR],
 [AC_CACHE_CHECK([for objdir],
   [libltdl_cv_objdir],
   [libltdl_cv_objdir="$objdir"
   if test -n "$objdir"; then
     :
   else
     rm -f .libs 2>/dev/null
     mkdir .libs 2>/dev/null
     if test -d .libs; then
       libltdl_cv_objdir=.libs
     else
       # MS-DOS does not allow filenames that begin with a dot.
       libltdl_cv_objdir=_libs
     fi
   rmdir .libs 2>/dev/null
   fi
   ])
 AC_DEFINE_UNQUOTED(LTDL_OBJDIR, "$libltdl_cv_objdir/",
   [Define to the sub-directory in which libtool stores uninstalled libraries.])
 ])# AC_LTDL_OBJDIR


 # AC_LTDL_DLPREOPEN
 # -----------------
 AC_DEFUN([AC_LTDL_DLPREOPEN],
 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
 AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
   [libltdl_cv_preloaded_symbols],
   [if test -n "$lt_cv_sys_global_symbol_pipe"; then
     libltdl_cv_preloaded_symbols=yes
   else
     libltdl_cv_preloaded_symbols=no
   fi
   ])
 if test x"$libltdl_cv_preloaded_symbols" = xyes; then
   AC_DEFINE(HAVE_PRELOADED_SYMBOLS, 1,
     [Define if libtool can extract symbol lists from object files.])
 fi
 ])# AC_LTDL_DLPREOPEN


 # AC_LTDL_DLLIB
 # -------------
 AC_DEFUN([AC_LTDL_DLLIB],
 [m4_pattern_allow([^LT_DLLOADERS$])
 LT_DLLOADERS=
 AC_SUBST([LT_DLLOADERS])

 AC_LANG_PUSH([C])

 LIBADD_DLOPEN=
 AC_CHECK_LIB([dl], [dlopen],
 	[AC_DEFINE([HAVE_LIBDL], [1],
 		   [Define if you have the libdl library or equivalent.])
 	LIBADD_DLOPEN="-ldl" libltdl_cv_lib_dl_dlopen="yes"
 	LT_DLLOADERS="$LT_DLLOADERS dlopen.la"],
     [AC_TRY_LINK([#if HAVE_DLFCN_H
 #  include <dlfcn.h>
 #endif
     ], [dlopen(0, 0);],
 	    [AC_DEFINE([HAVE_LIBDL], [1],
 		       [Define if you have the libdl library or equivalent.])
 	    libltdl_cv_func_dlopen="yes"
 	    LT_DLLOADERS="$LT_DLLOADERS dlopen.la"],
 	[AC_CHECK_LIB([svld], [dlopen],
 		[AC_DEFINE([HAVE_LIBDL], [1],
 			 [Define if you have the libdl library or equivalent.])
 	        LIBADD_DLOPEN="-lsvld" libltdl_cv_func_dlopen="yes"
 		LT_DLLOADERS="$LT_DLLOADERS dlopen.la"])])])
 if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes
 then
   lt_save_LIBS="$LIBS"
   LIBS="$LIBS $LIBADD_DLOPEN"
   AC_CHECK_FUNCS([dlerror])
   LIBS="$lt_save_LIBS"
 fi
 AC_SUBST([LIBADD_DLOPEN])

 LIBADD_SHL_LOAD=
 AC_CHECK_FUNC([shl_load],
 	[AC_DEFINE([HAVE_SHL_LOAD], [1],
 		   [Define if you have the shl_load function.])
 	LT_DLLOADERS="$LT_DLLOADERS shl_load.la"],
     [AC_CHECK_LIB([dld], [shl_load],
 	    [AC_DEFINE([HAVE_SHL_LOAD], [1],
 		       [Define if you have the shl_load function.])
 	    LT_DLLOADERS="$LT_DLLOADERS shl_load.la"
 	    LIBADD_SHL_LOAD="-ldld"])])
 AC_SUBST([LIBADD_SHL_LOAD])

 AC_CHECK_FUNC([_dyld_func_lookup],
 	[AC_DEFINE([HAVE_DYLD], [1],
 		   [Define if you have the _dyld_func_lookup function.])
 	LT_DLLOADERS="$LT_DLLOADERS dyld.la"])

 case $host_os in
 beos*)
   LT_DLLOADERS="$LT_DLLOADERS load_add_on.la"
   ;;
 cygwin* | mingw* | os2* | pw32*)
   LT_DLLOADERS="$LT_DLLOADERS loadlibrary.la"
   ;;
 esac

 AC_CHECK_LIB([dld], [dld_link],
 	[AC_DEFINE([HAVE_DLD], [1],
 		   [Define if you have the GNU dld library.])
 		LT_DLLOADERS="$LT_DLLOADERS dld_link.la"])
 AC_SUBST([LIBADD_DLD_LINK])

 m4_pattern_allow([^LT_DLPREOPEN$])
 LT_DLPREOPEN=
 for lt_loader in $LT_DLLOADERS; do
   LT_DLPREOPEN="$LT_DLPREOPEN-dlpreopen loaders/$lt_loader "
 done
 AC_SUBST([LT_DLPREOPEN])

 dnl This isn't used anymore, but set it for backwards compatibility
 LIBADD_DL="$LIBADD_DLOPEN $LIBADD_SHL_LOAD"
 AC_SUBST([LIBADD_DL])

 AC_LANG_POP
 ])# AC_LTDL_DLLIB


 # AC_LTDL_SYMBOL_USCORE
 # ---------------------
 # does the compiler prefix global symbols with an underscore?
 AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
 AC_CACHE_CHECK([for _ prefix in compiled symbols],
   [ac_cv_sys_symbol_underscore],
   [ac_cv_sys_symbol_underscore=no
   cat > conftest.$ac_ext <<EOF
 void nm_test_func(){}
 int main(){nm_test_func;return 0;}
 EOF
   if AC_TRY_EVAL(ac_compile); then
     # Now try to grab the symbols.
     ac_nlist=conftest.nm
     if AC_TRY_EVAL(NM conftest.$ac_objext \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
       # See whether the symbols have a leading underscore.
       if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
         ac_cv_sys_symbol_underscore=yes
       else
         if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
 	  :
         else
 	  echo "configure: cannot find nm_test_func in $ac_nlist" >&AS_MESSAGE_LOG_FD
         fi
       fi
     else
       echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AS_MESSAGE_LOG_FD
     fi
   else
     echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
     cat conftest.c >&AS_MESSAGE_LOG_FD
   fi
   rm -rf conftest*
   ])
 ])# AC_LTDL_SYMBOL_USCORE


 # AC_LTDL_DLSYM_USCORE
 # --------------------
 AC_DEFUN([AC_LTDL_DLSYM_USCORE],
 [AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
 if test x"$ac_cv_sys_symbol_underscore" = xyes; then
   if test x"$libltdl_cv_func_dlopen" = xyes ||
      test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
 	AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
 	  [libltdl_cv_need_uscore],
 	  [libltdl_cv_need_uscore=unknown
           save_LIBS="$LIBS"
           LIBS="$LIBS $LIBADD_DLOPEN"
 	  _LT_AC_TRY_DLOPEN_SELF(
 	    [libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
 	    [],				 [libltdl_cv_need_uscore=cross])
 	  LIBS="$save_LIBS"
 	])
   fi
 fi

 if test x"$libltdl_cv_need_uscore" = xyes; then
   AC_DEFINE(NEED_USCORE, 1,
     [Define if dlsym() requires a leading underscore in symbol names.])
 fi
 ])# AC_LTDL_DLSYM_USCORE
	## ltdl.m4 - Configure ltdl for the target system. --Autoconf--
	## Copyright (C) 1999-2004 Free Software Foundation, Inc.
	##
	## 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 2 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.
	##
	## You should have received a copy of the GNU General Public License
	## along with this program; if not, write to the Free Software
	## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	##
	## As a special exception to the GNU General Public License, if you
	## distribute this file as part of a program that contains a
	## configuration script generated by Autoconf, you may include it under
	## the same distribution terms that you use for the rest of that program.

	# serial 6 AC_LIB_LTDL

	# AC_WITH_LTDL([DIRECTORY])
	# -------------------------
	# Clients of libltdl can use this macro to allow the installer to
	# choose between a shipped copy of the ltdl sources or a preinstalled
	# version of the library.
	AC_DEFUN([AC_WITH_LTDL],
	[AC_ARG_WITH([included_ltdl],
	[AC_HELP_STRING([--with-included-ltdl],
	[use the GNU ltdl sources included here])])

	if test "x$with_included_ltdl" != xyes; then
	# We are not being forced to use the included libltdl sources, so
	# decide whether there is a useful installed version we can use.
	AC_CHECK_HEADER([ltdl.h],
	[AC_CHECK_LIB([ltdl], [lt_dlcaller_register],
	[with_included_ltdl=no],
	[with_included_ltdl=yes])],

	[],
	[AC_INCLUDES_DEFAULT]
	)
	fi

	if test "x$enable_ltdl_install" != xyes; then
	# If the user did not specify an installable libltdl, then default
	# to a convenience lib.
	AC_LIBLTDL_CONVENIENCE
	fi

	if test "x$with_included_ltdl" = xno; then
	# If the included ltdl is not to be used. then Use the
	# preinstalled libltdl we found.
	AC_DEFINE([HAVE_LTDL], 1,
	[Define this if a modern libltdl is already installed])
	LIBLTDL=-lltdl
	fi

	# Report our decision...
	AC_MSG_CHECKING([whether to use included libltdl])
	AC_MSG_RESULT([$with_included_ltdl])

	AC_CONFIG_SUBDIRS(m4_if($#, 1, [$1], [libltdl]))
	])# AC_WITH_LTDL


	# AC_LIBLTDL_CONVENIENCE([DIRECTORY])
	# -----------------------------------
	# sets LIBLTDL to the link flags for the libltdl convenience library and
	# LTDLINCL to the include flags for the libltdl header and adds
	# --enable-ltdl-convenience to the configure arguments. Note that LIBLTDL
	# and LTDLINCL are not AC_SUBSTed, nor is AC_CONFIG_SUBDIRS called. If
	# DIRECTORY is not provided, it is assumed to be `libltdl'. LIBLTDL will
	# be prefixed with '${top_builddir}/' and LTDLINCL will be prefixed with
	# '${top_srcdir}/' (note the single quotes!). If your package is not
	# flat and you're not using automake, define top_builddir and
	# top_srcdir appropriately in the Makefiles.
	AC_DEFUN([AC_LIBLTDL_CONVENIENCE],
	[case $enable_ltdl_convenience in
	no) AC_MSG_ERROR([this package needs a convenience libltdl]) ;;
	"") enable_ltdl_convenience=yes
	ac_configure_args="$ac_configure_args --enable-ltdl-convenience" ;;
	esac
	LIBLTDL='${top_builddir}/'m4_if($#, 1, [$1], ['libltdl'])/libltdlc.la
	LTDLINCL='-I${top_srcdir}/'m4_if($#, 1, [$1], ['libltdl'])

	AC_SUBST([LIBLTDL])
	AC_SUBST([LTDLINCL])

	# For backwards non-gettext consistent compatibility...
	INCLTDL="$LTDLINCL"
	AC_SUBST([INCLTDL])
	])# AC_LIBLTDL_CONVENIENCE


	# AC_LIBLTDL_INSTALLABLE([DIRECTORY])
	# -----------------------------------
	# sets LIBLTDL to the link flags for the libltdl installable library and
	# LTDLINCL to the include flags for the libltdl header and adds
	# --enable-ltdl-install to the configure arguments. Note that LIBLTDL
	# and LTDLINCL are not AC_SUBSTed, nor is AC_CONFIG_SUBDIRS called. If
	# DIRECTORY is not provided and an installed libltdl is not found, it is
	# assumed to be `libltdl'. LIBLTDL will be prefixed with '${top_builddir}/'
	# and LTDLINCL will be prefixed with '${top_srcdir}/' (note the single
	# quotes!). If your package is not flat and you're not using automake,
	# define top_builddir and top_srcdir appropriately in the Makefiles.
	# In the future, this macro may have to be called after LT_INIT.
	AC_DEFUN([AC_LIBLTDL_INSTALLABLE],
	[AC_CHECK_LIB(ltdl, lt_dlinit,
	[test x"$enable_ltdl_install" != xyes && enable_ltdl_install=no],
	[if test x"$enable_ltdl_install" = xno; then
	AC_MSG_WARN([libltdl not installed, but installation disabled])
	else
	enable_ltdl_install=yes
	fi
	])
	if test x"$enable_ltdl_install" = x"yes"; then
	ac_configure_args="$ac_configure_args --enable-ltdl-install"
	LIBLTDL='${top_builddir}/'m4_if($#, 1, [$1], ['libltdl'])/libltdl.la
	LTDLINCL='-I${top_srcdir}/'m4_if($#, 1, [$1], ['libltdl'])
	else
	ac_configure_args="$ac_configure_args --enable-ltdl-install=no"
	LIBLTDL="-lltdl"
	LTDLINCL=
	fi

	AC_SUBST([LIBLTDL])
	AC_SUBST([LTDLINCL])

	# For backwards non-gettext consistent compatibility...
	INCLTDL="$LTDLINCL"
	AC_SUBST([INCLTDL])
	])# AC_LIBLTDL_INSTALLABLE


	# AC_LIB_LTDL
	# -----------
	# Perform all the checks necessary for compilation of the ltdl objects
	# -- including compiler checks and header checks.
	AC_DEFUN([AC_LIB_LTDL],
	[AC_REQUIRE([AC_PROG_CC])
	AC_REQUIRE([AC_C_CONST])
	AC_REQUIRE([AC_HEADER_STDC])
	AC_REQUIRE([AC_HEADER_DIRENT])
	AC_REQUIRE([_LT_AC_CHECK_DLFCN])
	AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])
	AC_REQUIRE([AC_LTDL_SHLIBEXT])
	AC_REQUIRE([AC_LTDL_SHLIBPATH])
	AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])
	AC_REQUIRE([AC_LTDL_OBJDIR])
	AC_REQUIRE([AC_LTDL_DLPREOPEN])
	AC_REQUIRE([AC_LTDL_DLLIB])
	AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
	AC_REQUIRE([AC_LTDL_DLSYM_USCORE])
	AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])
	AC_REQUIRE([gl_FUNC_ARGZ])

	# In order that ltdl.c can compile, run AC_CONFIG_HEADERS for the user
	# if they did not call it themself. This is so that ltdl.h can pick up
	# the parent projects config.h file, The first file in AC_CONFIG_HEADERS
	# must contain the definitions required by ltdl.c.
	m4_ifset([AC_LIST_HEADERS],
	[CONFIG_H=`echo "AC_LIST_HEADERS" \| $SED 's,^[[ ]],,;s,[[ :]].$,,'`],
	[CONFIG_H=config.h;AC_CONFIG_HEADERS([config.h])])
	AC_SUBST([CONFIG_H])

	AC_CHECK_HEADERS([memory.h unistd.h dl.h sys/dl.h dld.h mach-o/dyld.h],
	[], [], [AC_INCLUDES_DEFAULT])
	AC_CHECK_HEADERS([string.h strings.h], [break], [], [AC_INCLUDES_DEFAULT])

	AC_CHECK_FUNCS([closedir opendir readdir], [], [AC_LIBOBJ([lt__dirent])])
	])# AC_LIB_LTDL


	# AC_LTDL_ENABLE_INSTALL
	# ----------------------
	AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
	[AC_ARG_ENABLE([ltdl-install],
	[AC_HELP_STRING([--enable-ltdl-install], [install libltdl])])

	AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno)
	AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno)
	])])# AC_LTDL_ENABLE_INSTALL


	# AC_LTDL_SYS_DLOPEN_DEPLIBS
	# --------------------------
	AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS],
	[AC_REQUIRE([AC_CANONICAL_HOST])
	AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
	[libltdl_cv_sys_dlopen_deplibs],
	[# PORTME does your system automatically load deplibs for dlopen?
	# or its logical equivalent (e.g. shl_load for HP-UX < 11)
	# For now, we just catch OSes we know something about -- in the
	# future, we'll try test this programmatically.
	libltdl_cv_sys_dlopen_deplibs=unknown
	case "$host_os" in
	aix3\|aix4.1.\|aix4.2.*)
	# Unknown whether this is true for these versions of AIX, but
	# we want this `case' here to explicitly catch those versions.
	libltdl_cv_sys_dlopen_deplibs=unknown
	;;
	aix[[45]]*)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	darwin*)
	# Assuming the user has installed a libdl from somewhere, this is true
	# If you are looking for one http://www.opendarwin.org/projects/dlcompat
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	gnu* \| linux* \| kfreebsd-gnu \| knetbsd-gnu)
	# GNU and its variants, using gnu ld.so (Glibc)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	hpux10\|hpux11)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	irix[[12345]]\|irix6.[[01]])
	# Catch all versions of IRIX before 6.2, and indicate that we don't
	# know how it worked for any of those versions.
	libltdl_cv_sys_dlopen_deplibs=unknown
	;;
	irix*)
	# The case above catches anything before 6.2, and it's known that
	# at 6.2 and later dlopen does load deplibs.
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	netbsd*)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	openbsd*)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	osf[[1234]]*)
	# dlopen did load deplibs (at least at 4.x), but until the 5.x series,
	# it did not use an RPATH in a shared library to find objects the
	# library depends on, so we explictly say `no'.
	libltdl_cv_sys_dlopen_deplibs=no
	;;
	osf5.0\|osf5.0a\|osf5.1)
	# dlopen does load deplibs and with the right loader patch applied
	# it even uses RPATH in a shared library to search for shared objects
	# that the library depends on, but there's no easy way to know if that
	# patch is installed. Since this is the case, all we can really
	# say is unknown -- it depends on the patch being installed. If
	# it is, this changes to `yes'. Without it, it would be `no'.
	libltdl_cv_sys_dlopen_deplibs=unknown
	;;
	osf*)
	# the two cases above should catch all versions of osf <= 5.1. Read
	# the comments above for what we know about them.
	# At > 5.1, deplibs are loaded and any RPATH in a shared library
	# is used to find them so we can finally say `yes'.
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	qnx*)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	solaris*)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	esac
	])
	if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
	AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1],
	[Define if the OS needs help to load dependent libraries for dlopen().])
	fi
	])# AC_LTDL_SYS_DLOPEN_DEPLIBS


	# AC_LTDL_SHLIBEXT
	# ----------------
	AC_DEFUN([AC_LTDL_SHLIBEXT],
	[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
	AC_CACHE_CHECK([which extension is used for loadable modules],
	[libltdl_cv_shlibext],
	[
	module=yes
	eval libltdl_cv_shlibext=$shrext_cmds
	])
	if test -n "$libltdl_cv_shlibext"; then
	AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",
	[Define to the extension used for shared libraries, say, ".so".])
	fi
	])# AC_LTDL_SHLIBEXT


	# AC_LTDL_SHLIBPATH
	# -----------------
	AC_DEFUN([AC_LTDL_SHLIBPATH],
	[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
	AC_CACHE_CHECK([which variable specifies run-time library path],
	[libltdl_cv_shlibpath_var], [libltdl_cv_shlibpath_var="$shlibpath_var"])
	if test -n "$libltdl_cv_shlibpath_var"; then
	AC_DEFINE_UNQUOTED(LTDL_SHLIBPATH_VAR, "$libltdl_cv_shlibpath_var",
	[Define to the name of the environment variable that determines the dynamic library search path.])
	fi
	])# AC_LTDL_SHLIBPATH


	# AC_LTDL_SYSSEARCHPATH
	# ---------------------
	AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
	[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
	AC_CACHE_CHECK([for the default library search path],
	[libltdl_cv_sys_search_path],
	[libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
	if test -n "$libltdl_cv_sys_search_path"; then
	sys_search_path=
	for dir in $libltdl_cv_sys_search_path; do
	if test -z "$sys_search_path"; then
	sys_search_path="$dir"
	else
	sys_search_path="$sys_search_path$PATH_SEPARATOR$dir"
	fi
	done
	AC_DEFINE_UNQUOTED(LTDL_SYSSEARCHPATH, "$sys_search_path",
	[Define to the system default library search path.])
	fi
	])# AC_LTDL_SYSSEARCHPATH


	# AC_LTDL_OBJDIR
	# --------------
	AC_DEFUN([AC_LTDL_OBJDIR],
	[AC_CACHE_CHECK([for objdir],
	[libltdl_cv_objdir],
	[libltdl_cv_objdir="$objdir"
	if test -n "$objdir"; then
	:
	else
	rm -f .libs 2>/dev/null
	mkdir .libs 2>/dev/null
	if test -d .libs; then
	libltdl_cv_objdir=.libs
	else
	# MS-DOS does not allow filenames that begin with a dot.
	libltdl_cv_objdir=_libs
	fi
	rmdir .libs 2>/dev/null
	fi
	])
	AC_DEFINE_UNQUOTED(LTDL_OBJDIR, "$libltdl_cv_objdir/",
	[Define to the sub-directory in which libtool stores uninstalled libraries.])
	])# AC_LTDL_OBJDIR


	# AC_LTDL_DLPREOPEN
	# -----------------
	AC_DEFUN([AC_LTDL_DLPREOPEN],
	[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
	AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
	[libltdl_cv_preloaded_symbols],
	[if test -n "$lt_cv_sys_global_symbol_pipe"; then
	libltdl_cv_preloaded_symbols=yes
	else
	libltdl_cv_preloaded_symbols=no
	fi
	])
	if test x"$libltdl_cv_preloaded_symbols" = xyes; then
	AC_DEFINE(HAVE_PRELOADED_SYMBOLS, 1,
	[Define if libtool can extract symbol lists from object files.])
	fi
	])# AC_LTDL_DLPREOPEN


	# AC_LTDL_DLLIB
	# -------------
	AC_DEFUN([AC_LTDL_DLLIB],
	[m4_pattern_allow([^LT_DLLOADERS$])
	LT_DLLOADERS=
	AC_SUBST([LT_DLLOADERS])

	AC_LANG_PUSH([C])

	LIBADD_DLOPEN=
	AC_CHECK_LIB([dl], [dlopen],
	[AC_DEFINE([HAVE_LIBDL], [1],
	[Define if you have the libdl library or equivalent.])
	LIBADD_DLOPEN="-ldl" libltdl_cv_lib_dl_dlopen="yes"
	LT_DLLOADERS="$LT_DLLOADERS dlopen.la"],
	[AC_TRY_LINK([#if HAVE_DLFCN_H
	# include <dlfcn.h>
	#endif
	], [dlopen(0, 0);],
	[AC_DEFINE([HAVE_LIBDL], [1],
	[Define if you have the libdl library or equivalent.])
	libltdl_cv_func_dlopen="yes"
	LT_DLLOADERS="$LT_DLLOADERS dlopen.la"],
	[AC_CHECK_LIB([svld], [dlopen],
	[AC_DEFINE([HAVE_LIBDL], [1],
	[Define if you have the libdl library or equivalent.])
	LIBADD_DLOPEN="-lsvld" libltdl_cv_func_dlopen="yes"
	LT_DLLOADERS="$LT_DLLOADERS dlopen.la"])])])
	if test x"$libltdl_cv_func_dlopen" = xyes \|\| test x"$libltdl_cv_lib_dl_dlopen" = xyes
	then
	lt_save_LIBS="$LIBS"
	LIBS="$LIBS $LIBADD_DLOPEN"
	AC_CHECK_FUNCS([dlerror])
	LIBS="$lt_save_LIBS"
	fi
	AC_SUBST([LIBADD_DLOPEN])

	LIBADD_SHL_LOAD=
	AC_CHECK_FUNC([shl_load],
	[AC_DEFINE([HAVE_SHL_LOAD], [1],
	[Define if you have the shl_load function.])
	LT_DLLOADERS="$LT_DLLOADERS shl_load.la"],
	[AC_CHECK_LIB([dld], [shl_load],
	[AC_DEFINE([HAVE_SHL_LOAD], [1],
	[Define if you have the shl_load function.])
	LT_DLLOADERS="$LT_DLLOADERS shl_load.la"
	LIBADD_SHL_LOAD="-ldld"])])
	AC_SUBST([LIBADD_SHL_LOAD])

	AC_CHECK_FUNC([_dyld_func_lookup],
	[AC_DEFINE([HAVE_DYLD], [1],
	[Define if you have the _dyld_func_lookup function.])
	LT_DLLOADERS="$LT_DLLOADERS dyld.la"])

	case $host_os in
	beos*)
	LT_DLLOADERS="$LT_DLLOADERS load_add_on.la"
	;;
	cygwin* \| mingw* \| os2* \| pw32*)
	LT_DLLOADERS="$LT_DLLOADERS loadlibrary.la"
	;;
	esac

	AC_CHECK_LIB([dld], [dld_link],
	[AC_DEFINE([HAVE_DLD], [1],
	[Define if you have the GNU dld library.])
	LT_DLLOADERS="$LT_DLLOADERS dld_link.la"])
	AC_SUBST([LIBADD_DLD_LINK])

	m4_pattern_allow([^LT_DLPREOPEN$])
	LT_DLPREOPEN=
	for lt_loader in $LT_DLLOADERS; do
	LT_DLPREOPEN="$LT_DLPREOPEN-dlpreopen loaders/$lt_loader "
	done
	AC_SUBST([LT_DLPREOPEN])

	dnl This isn't used anymore, but set it for backwards compatibility
	LIBADD_DL="$LIBADD_DLOPEN $LIBADD_SHL_LOAD"
	AC_SUBST([LIBADD_DL])

	AC_LANG_POP
	])# AC_LTDL_DLLIB


	# AC_LTDL_SYMBOL_USCORE
	# ---------------------
	# does the compiler prefix global symbols with an underscore?
	AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
	[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
	AC_CACHE_CHECK([for _ prefix in compiled symbols],
	[ac_cv_sys_symbol_underscore],
	[ac_cv_sys_symbol_underscore=no
	cat > conftest.$ac_ext <<EOF
	void nm_test_func(){}
	int main(){nm_test_func;return 0;}
	EOF
	if AC_TRY_EVAL(ac_compile); then
	# Now try to grab the symbols.
	ac_nlist=conftest.nm
	if AC_TRY_EVAL(NM conftest.$ac_objext \\| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
	# See whether the symbols have a leading underscore.
	if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
	ac_cv_sys_symbol_underscore=yes
	else
	if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
	:
	else
	echo "configure: cannot find nm_test_func in $ac_nlist" >&AS_MESSAGE_LOG_FD
	fi
	fi
	else
	echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AS_MESSAGE_LOG_FD
	fi
	else
	echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
	cat conftest.c >&AS_MESSAGE_LOG_FD
	fi
	rm -rf conftest*
	])
	])# AC_LTDL_SYMBOL_USCORE


	# AC_LTDL_DLSYM_USCORE
	# --------------------
	AC_DEFUN([AC_LTDL_DLSYM_USCORE],
	[AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
	if test x"$ac_cv_sys_symbol_underscore" = xyes; then
	if test x"$libltdl_cv_func_dlopen" = xyes \|\|
	test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
	AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
	[libltdl_cv_need_uscore],
	[libltdl_cv_need_uscore=unknown
	save_LIBS="$LIBS"
	LIBS="$LIBS $LIBADD_DLOPEN"
	_LT_AC_TRY_DLOPEN_SELF(
	[libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
	[], [libltdl_cv_need_uscore=cross])
	LIBS="$save_LIBS"
	])
	fi
	fi

	if test x"$libltdl_cv_need_uscore" = xyes; then
	AC_DEFINE(NEED_USCORE, 1,
	[Define if dlsym() requires a leading underscore in symbol names.])
	fi
	])# AC_LTDL_DLSYM_USCORE