aclocal.m4

# generated automatically by aclocal 1.13.3 -*- Autoconf -*-

# Copyright (C) 1996-2013 Free Software Foundation, Inc.

# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.

m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
m4_ifndef([AC_AUTOCONF_VERSION],
  [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.69],,
[m4_warning([this file was generated for autoconf 2.69.
You have another version of autoconf.  It may work, but is not guaranteed to.
If you have problems, you may need to regenerate the build system entirely.
To do so, use the procedure documented by the package, typically 'autoreconf'.])])

# ============================================================================
#  http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html
# ============================================================================
#
# SYNOPSIS
#
#   AX_CXX_COMPILE_STDCXX_11([ext|noext],[mandatory|optional])
#
# DESCRIPTION
#
#   Check for baseline language coverage in the compiler for the C++11
#   standard; if necessary, add switches to CXXFLAGS to enable support.
#
#   The first argument, if specified, indicates whether you insist on an
#   extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
#   -std=c++11).  If neither is specified, you get whatever works, with
#   preference for an extended mode.
#
#   The second argument, if specified 'mandatory' or if left unspecified,
#   indicates that baseline C++11 support is required and that the macro
#   should error out if no mode with that support is found.  If specified
#   'optional', then configuration proceeds regardless, after defining
#   HAVE_CXX11 if and only if a supporting mode is found.
#
# LICENSE
#
#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
#   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
#   Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved. This file is offered as-is, without any
#   warranty.

#serial 3

m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [
  template <typename T>
    struct check
    {
      static_assert(sizeof(int) <= sizeof(T), "not big enough");
    };

    typedef check<check<bool>> right_angle_brackets;

    int a;
    decltype(a) b;

    typedef check<int> check_type;
    check_type c;
    check_type&& cr = static_cast<check_type&&>(c);

    auto d = a;
])

AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
  m4_if([$1], [], [],
        [$1], [ext], [],
        [$1], [noext], [],
        [m4_fatal([invalid argument `$1' to AX_CXX_COMPILE_STDCXX_11])])dnl
  m4_if([$2], [], [ax_cxx_compile_cxx11_required=true],
        [$2], [mandatory], [ax_cxx_compile_cxx11_required=true],
        [$2], [optional], [ax_cxx_compile_cxx11_required=false],
        [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX_11])])dnl
  AC_LANG_PUSH([C++])dnl
  ac_success=no
  AC_CACHE_CHECK(whether $CXX supports C++11 features by default,
  ax_cv_cxx_compile_cxx11,
  [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
    [ax_cv_cxx_compile_cxx11=yes],
    [ax_cv_cxx_compile_cxx11=no])])
  if test x$ax_cv_cxx_compile_cxx11 = xyes; then
    ac_success=yes
  fi

  m4_if([$1], [noext], [], [dnl
  if test x$ac_success = xno; then
    for switch in -std=gnu++11 -std=gnu++0x; do
      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch])
      AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch,
                     $cachevar,
        [ac_save_CXXFLAGS="$CXXFLAGS"
         CXXFLAGS="$CXXFLAGS $switch"
         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
          [eval $cachevar=yes],
          [eval $cachevar=no])
         CXXFLAGS="$ac_save_CXXFLAGS"])
      if eval test x\$$cachevar = xyes; then
        CXXFLAGS="$CXXFLAGS $switch"
        ac_success=yes
        break
      fi
    done
  fi])

  m4_if([$1], [ext], [], [dnl
  if test x$ac_success = xno; then
    for switch in -std=c++11 -std=c++0x; do
      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch])
      AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch,
                     $cachevar,
        [ac_save_CXXFLAGS="$CXXFLAGS"
         CXXFLAGS="$CXXFLAGS $switch"
         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
          [eval $cachevar=yes],
          [eval $cachevar=no])
         CXXFLAGS="$ac_save_CXXFLAGS"])
      if eval test x\$$cachevar = xyes; then
        CXXFLAGS="$CXXFLAGS $switch"
        ac_success=yes
        break
      fi
    done
  fi])
  AC_LANG_POP([C++])
  if test x$ax_cxx_compile_cxx11_required = xtrue; then
    if test x$ac_success = xno; then
      AC_MSG_ERROR([*** A compiler with support for C++11 language features is required.])
    fi
  else
    if test x$ac_success = xno; then
      HAVE_CXX11=0
      AC_MSG_NOTICE([No compiler with C++11 support was found])
    else
      HAVE_CXX11=1
      AC_DEFINE(HAVE_CXX11,1,
                [define if the compiler supports basic C++11 syntax])
    fi

    AC_SUBST(HAVE_CXX11)
  fi
])

# ===========================================================================
#      http://www.gnu.org/software/autoconf-archive/ax_prog_doxygen.html
# ===========================================================================
#
# SYNOPSIS
#
#   DX_INIT_DOXYGEN(PROJECT-NAME, DOXYFILE-PATH, [OUTPUT-DIR])
#   DX_DOXYGEN_FEATURE(ON|OFF)
#   DX_DOT_FEATURE(ON|OFF)
#   DX_HTML_FEATURE(ON|OFF)
#   DX_CHM_FEATURE(ON|OFF)
#   DX_CHI_FEATURE(ON|OFF)
#   DX_MAN_FEATURE(ON|OFF)
#   DX_RTF_FEATURE(ON|OFF)
#   DX_XML_FEATURE(ON|OFF)
#   DX_PDF_FEATURE(ON|OFF)
#   DX_PS_FEATURE(ON|OFF)
#
# DESCRIPTION
#
#   The DX_*_FEATURE macros control the default setting for the given
#   Doxygen feature. Supported features are 'DOXYGEN' itself, 'DOT' for
#   generating graphics, 'HTML' for plain HTML, 'CHM' for compressed HTML
#   help (for MS users), 'CHI' for generating a seperate .chi file by the
#   .chm file, and 'MAN', 'RTF', 'XML', 'PDF' and 'PS' for the appropriate
#   output formats. The environment variable DOXYGEN_PAPER_SIZE may be
#   specified to override the default 'a4wide' paper size.
#
#   By default, HTML, PDF and PS documentation is generated as this seems to
#   be the most popular and portable combination. MAN pages created by
#   Doxygen are usually problematic, though by picking an appropriate subset
#   and doing some massaging they might be better than nothing. CHM and RTF
#   are specific for MS (note that you can't generate both HTML and CHM at
#   the same time). The XML is rather useless unless you apply specialized
#   post-processing to it.
#
#   The macros mainly control the default state of the feature. The use can
#   override the default by specifying --enable or --disable. The macros
#   ensure that contradictory flags are not given (e.g.,
#   --enable-doxygen-html and --enable-doxygen-chm,
#   --enable-doxygen-anything with --disable-doxygen, etc.) Finally, each
#   feature will be automatically disabled (with a warning) if the required
#   programs are missing.
#
#   Once all the feature defaults have been specified, call DX_INIT_DOXYGEN
#   with the following parameters: a one-word name for the project for use
#   as a filename base etc., an optional configuration file name (the
#   default is 'Doxyfile', the same as Doxygen's default), and an optional
#   output directory name (the default is 'doxygen-doc').
#
#   Automake Support
#
#   The following is a template aminclude.am file for use with Automake.
#   Make targets and variables values are controlled by the various
#   DX_COND_* conditionals set by autoconf.
#
#   The provided targets are:
#
#     doxygen-doc: Generate all doxygen documentation.
#
#     doxygen-run: Run doxygen, which will generate some of the
#                  documentation (HTML, CHM, CHI, MAN, RTF, XML)
#                  but will not do the post processing required
#                  for the rest of it (PS, PDF, and some MAN).
#
#     doxygen-man: Rename some doxygen generated man pages.
#
#     doxygen-ps:  Generate doxygen PostScript documentation.
#
#     doxygen-pdf: Generate doxygen PDF documentation.
#
#   Note that by default these are not integrated into the automake targets.
#   If doxygen is used to generate man pages, you can achieve this
#   integration by setting man3_MANS to the list of man pages generated and
#   then adding the dependency:
#
#     $(man3_MANS): doxygen-doc
#
#   This will cause make to run doxygen and generate all the documentation.
#
#   The following variable is intended for use in Makefile.am:
#
#     DX_CLEANFILES = everything to clean.
#
#   Then add this variable to MOSTLYCLEANFILES.
#
#     ----- begin aminclude.am -------------------------------------
#
#     ## --------------------------------- ##
#     ## Format-independent Doxygen rules. ##
#     ## --------------------------------- ##
#
#     if DX_COND_doc
#
#     ## ------------------------------- ##
#     ## Rules specific for HTML output. ##
#     ## ------------------------------- ##
#
#     if DX_COND_html
#
#     DX_CLEAN_HTML = @DX_DOCDIR@/html
#
#     endif DX_COND_html
#
#     ## ------------------------------ ##
#     ## Rules specific for CHM output. ##
#     ## ------------------------------ ##
#
#     if DX_COND_chm
#
#     DX_CLEAN_CHM = @DX_DOCDIR@/chm
#
#     if DX_COND_chi
#
#     DX_CLEAN_CHI = @DX_DOCDIR@/@PACKAGE@.chi
#
#     endif DX_COND_chi
#
#     endif DX_COND_chm
#
#     ## ------------------------------ ##
#     ## Rules specific for MAN output. ##
#     ## ------------------------------ ##
#
#     if DX_COND_man
#
#     DX_CLEAN_MAN = @DX_DOCDIR@/man
#
#     endif DX_COND_man
#
#     ## ------------------------------ ##
#     ## Rules specific for RTF output. ##
#     ## ------------------------------ ##
#
#     if DX_COND_rtf
#
#     DX_CLEAN_RTF = @DX_DOCDIR@/rtf
#
#     endif DX_COND_rtf
#
#     ## ------------------------------ ##
#     ## Rules specific for XML output. ##
#     ## ------------------------------ ##
#
#     if DX_COND_xml
#
#     DX_CLEAN_XML = @DX_DOCDIR@/xml
#
#     endif DX_COND_xml
#
#     ## ----------------------------- ##
#     ## Rules specific for PS output. ##
#     ## ----------------------------- ##
#
#     if DX_COND_ps
#
#     DX_CLEAN_PS = @DX_DOCDIR@/@PACKAGE@.ps
#
#     DX_PS_GOAL = doxygen-ps
#
#     doxygen-ps: @DX_DOCDIR@/@PACKAGE@.ps
#
#     @DX_DOCDIR@/@PACKAGE@.ps: @DX_DOCDIR@/@PACKAGE@.tag
#         cd @DX_DOCDIR@/latex; \
#         rm -f *.aux *.toc *.idx *.ind *.ilg *.log *.out; \
#         $(DX_LATEX) refman.tex; \
#         $(MAKEINDEX_PATH) refman.idx; \
#         $(DX_LATEX) refman.tex; \
#         countdown=5; \
#         while $(DX_EGREP) 'Rerun (LaTeX|to get cross-references right)' \
#                           refman.log > /dev/null 2>&1 \
#            && test $$countdown -gt 0; do \
#             $(DX_LATEX) refman.tex; \
#             countdown=`expr $$countdown - 1`; \
#         done; \
#         $(DX_DVIPS) -o ../@PACKAGE@.ps refman.dvi
#
#     endif DX_COND_ps
#
#     ## ------------------------------ ##
#     ## Rules specific for PDF output. ##
#     ## ------------------------------ ##
#
#     if DX_COND_pdf
#
#     DX_CLEAN_PDF = @DX_DOCDIR@/@PACKAGE@.pdf
#
#     DX_PDF_GOAL = doxygen-pdf
#
#     doxygen-pdf: @DX_DOCDIR@/@PACKAGE@.pdf
#
#     @DX_DOCDIR@/@PACKAGE@.pdf: @DX_DOCDIR@/@PACKAGE@.tag
#         cd @DX_DOCDIR@/latex; \
#         rm -f *.aux *.toc *.idx *.ind *.ilg *.log *.out; \
#         $(DX_PDFLATEX) refman.tex; \
#         $(DX_MAKEINDEX) refman.idx; \
#         $(DX_PDFLATEX) refman.tex; \
#         countdown=5; \
#         while $(DX_EGREP) 'Rerun (LaTeX|to get cross-references right)' \
#                           refman.log > /dev/null 2>&1 \
#            && test $$countdown -gt 0; do \
#             $(DX_PDFLATEX) refman.tex; \
#             countdown=`expr $$countdown - 1`; \
#         done; \
#         mv refman.pdf ../@PACKAGE@.pdf
#
#     endif DX_COND_pdf
#
#     ## ------------------------------------------------- ##
#     ## Rules specific for LaTeX (shared for PS and PDF). ##
#     ## ------------------------------------------------- ##
#
#     if DX_COND_latex
#
#     DX_CLEAN_LATEX = @DX_DOCDIR@/latex
#
#     endif DX_COND_latex
#
#     .PHONY: doxygen-run doxygen-doc $(DX_PS_GOAL) $(DX_PDF_GOAL)
#
#     .INTERMEDIATE: doxygen-run $(DX_PS_GOAL) $(DX_PDF_GOAL)
#
#     doxygen-run: @DX_DOCDIR@/@PACKAGE@.tag
#
#     doxygen-doc: doxygen-run $(DX_PS_GOAL) $(DX_PDF_GOAL)
#
#     @DX_DOCDIR@/@PACKAGE@.tag: $(DX_CONFIG) $(pkginclude_HEADERS)
#         rm -rf @DX_DOCDIR@
#         $(DX_ENV) $(DX_DOXYGEN) $(srcdir)/$(DX_CONFIG)
#
#     DX_CLEANFILES = \
#         @DX_DOCDIR@/@PACKAGE@.tag \
#         -r \
#         $(DX_CLEAN_HTML) \
#         $(DX_CLEAN_CHM) \
#         $(DX_CLEAN_CHI) \
#         $(DX_CLEAN_MAN) \
#         $(DX_CLEAN_RTF) \
#         $(DX_CLEAN_XML) \
#         $(DX_CLEAN_PS) \
#         $(DX_CLEAN_PDF) \
#         $(DX_CLEAN_LATEX)
#
#     endif DX_COND_doc
#
#     ----- end aminclude.am ---------------------------------------
#
# LICENSE
#
#   Copyright (c) 2009 Oren Ben-Kiki <oren@ben-kiki.org>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved. This file is offered as-is, without any
#   warranty.

#serial 12


DX_ENV=""
AC_DEFUN([DX_FEATURE_doc],  ON)
AC_DEFUN([DX_FEATURE_dot],  OFF)
AC_DEFUN([DX_FEATURE_man],  OFF)
AC_DEFUN([DX_FEATURE_html], ON)
AC_DEFUN([DX_FEATURE_chm],  OFF)
AC_DEFUN([DX_FEATURE_chi],  OFF)
AC_DEFUN([DX_FEATURE_rtf],  OFF)
AC_DEFUN([DX_FEATURE_xml],  OFF)
AC_DEFUN([DX_FEATURE_pdf],  ON)
AC_DEFUN([DX_FEATURE_ps],   ON)


# DX_ENV_APPEND(VARIABLE, VALUE)
# ------------------------------
# Append VARIABLE="VALUE" to DX_ENV for invoking doxygen.
AC_DEFUN([DX_ENV_APPEND], [AC_SUBST([DX_ENV], ["$DX_ENV $1='$2'"])])

# DX_DIRNAME_EXPR
# ---------------
# Expand into a shell expression prints the directory part of a path.
AC_DEFUN([DX_DIRNAME_EXPR],
         [[expr ".$1" : '\(\.\)[^/]*$' \| "x$1" : 'x\(.*\)/[^/]*$']])

# DX_IF_FEATURE(FEATURE, IF-ON, IF-OFF)
# -------------------------------------
# Expands according to the M4 (static) status of the feature.
AC_DEFUN([DX_IF_FEATURE], [ifelse(DX_FEATURE_$1, ON, [$2], [$3])])

# DX_REQUIRE_PROG(VARIABLE, PROGRAM)
# ----------------------------------
# Require the specified program to be found for the DX_CURRENT_FEATURE to work.
AC_DEFUN([DX_REQUIRE_PROG], [
AC_PATH_TOOL([$1], [$2])
if test "$DX_FLAG_[]DX_CURRENT_FEATURE$$1" = 1; then
    AC_MSG_WARN([$2 not found - will not DX_CURRENT_DESCRIPTION])
    AC_SUBST(DX_FLAG_[]DX_CURRENT_FEATURE, 0)
fi
])

# DX_TEST_FEATURE(FEATURE)
# ------------------------
# Expand to a shell expression testing whether the feature is active.
AC_DEFUN([DX_TEST_FEATURE], [test "$DX_FLAG_$1" = 1])

# DX_CHECK_DEPEND(REQUIRED_FEATURE, REQUIRED_STATE)
# -------------------------------------------------
# Verify that a required features has the right state before trying to turn on
# the DX_CURRENT_FEATURE.
AC_DEFUN([DX_CHECK_DEPEND], [
test "$DX_FLAG_$1" = "$2" \
|| AC_MSG_ERROR([doxygen-DX_CURRENT_FEATURE ifelse([$2], 1,
                            requires, contradicts) doxygen-DX_CURRENT_FEATURE])
])

# DX_CLEAR_DEPEND(FEATURE, REQUIRED_FEATURE, REQUIRED_STATE)
# ----------------------------------------------------------
# Turn off the DX_CURRENT_FEATURE if the required feature is off.
AC_DEFUN([DX_CLEAR_DEPEND], [
test "$DX_FLAG_$1" = "$2" || AC_SUBST(DX_FLAG_[]DX_CURRENT_FEATURE, 0)
])

# DX_FEATURE_ARG(FEATURE, DESCRIPTION,
#                CHECK_DEPEND, CLEAR_DEPEND,
#                REQUIRE, DO-IF-ON, DO-IF-OFF)
# --------------------------------------------
# Parse the command-line option controlling a feature. CHECK_DEPEND is called
# if the user explicitly turns the feature on (and invokes DX_CHECK_DEPEND),
# otherwise CLEAR_DEPEND is called to turn off the default state if a required
# feature is disabled (using DX_CLEAR_DEPEND). REQUIRE performs additional
# requirement tests (DX_REQUIRE_PROG). Finally, an automake flag is set and
# DO-IF-ON or DO-IF-OFF are called according to the final state of the feature.
AC_DEFUN([DX_ARG_ABLE], [
    AC_DEFUN([DX_CURRENT_FEATURE], [$1])
    AC_DEFUN([DX_CURRENT_DESCRIPTION], [$2])
    AC_ARG_ENABLE(doxygen-$1,
                  [AS_HELP_STRING(DX_IF_FEATURE([$1], [--disable-doxygen-$1],
                                                      [--enable-doxygen-$1]),
                                  DX_IF_FEATURE([$1], [don't $2], [$2]))],
                  [
case "$enableval" in
#(
y|Y|yes|Yes|YES)
    AC_SUBST([DX_FLAG_$1], 1)
    $3
;; #(
n|N|no|No|NO)
    AC_SUBST([DX_FLAG_$1], 0)
;; #(
*)
    AC_MSG_ERROR([invalid value '$enableval' given to doxygen-$1])
;;
esac
], [
AC_SUBST([DX_FLAG_$1], [DX_IF_FEATURE([$1], 1, 0)])
$4
])
if DX_TEST_FEATURE([$1]); then
    $5
    :
fi
AM_CONDITIONAL(DX_COND_$1, DX_TEST_FEATURE([$1]))
if DX_TEST_FEATURE([$1]); then
    $6
    :
else
    $7
    :
fi
])


# DX_XXX_FEATURE(DEFAULT_STATE)
# -----------------------------
AC_DEFUN([DX_DOXYGEN_FEATURE], [AC_DEFUN([DX_FEATURE_doc],  [$1])])
AC_DEFUN([DX_DOT_FEATURE],     [AC_DEFUN([DX_FEATURE_dot], [$1])])
AC_DEFUN([DX_MAN_FEATURE],     [AC_DEFUN([DX_FEATURE_man],  [$1])])
AC_DEFUN([DX_HTML_FEATURE],    [AC_DEFUN([DX_FEATURE_html], [$1])])
AC_DEFUN([DX_CHM_FEATURE],     [AC_DEFUN([DX_FEATURE_chm],  [$1])])
AC_DEFUN([DX_CHI_FEATURE],     [AC_DEFUN([DX_FEATURE_chi],  [$1])])
AC_DEFUN([DX_RTF_FEATURE],     [AC_DEFUN([DX_FEATURE_rtf],  [$1])])
AC_DEFUN([DX_XML_FEATURE],     [AC_DEFUN([DX_FEATURE_xml],  [$1])])
AC_DEFUN([DX_XML_FEATURE],     [AC_DEFUN([DX_FEATURE_xml],  [$1])])
AC_DEFUN([DX_PDF_FEATURE],     [AC_DEFUN([DX_FEATURE_pdf],  [$1])])
AC_DEFUN([DX_PS_FEATURE],      [AC_DEFUN([DX_FEATURE_ps],   [$1])])

# DX_INIT_DOXYGEN(PROJECT, [CONFIG-FILE], [OUTPUT-DOC-DIR])
# ---------------------------------------------------------
# PROJECT also serves as the base name for the documentation files.
# The default CONFIG-FILE is "Doxyfile" and OUTPUT-DOC-DIR is "doxygen-doc".
AC_DEFUN([DX_INIT_DOXYGEN], [

# Files:
AC_SUBST([DX_PROJECT], [$1])
AC_SUBST([DX_CONFIG], [ifelse([$2], [], Doxyfile, [$2])])
AC_SUBST([DX_DOCDIR], [ifelse([$3], [], doxygen-doc, [$3])])

# Environment variables used inside doxygen.cfg:
DX_ENV_APPEND(SRCDIR, $srcdir)
DX_ENV_APPEND(PROJECT, $DX_PROJECT)
DX_ENV_APPEND(DOCDIR, $DX_DOCDIR)
DX_ENV_APPEND(VERSION, $PACKAGE_VERSION)

# Doxygen itself:
DX_ARG_ABLE(doc, [generate any doxygen documentation],
            [],
            [],
            [DX_REQUIRE_PROG([DX_DOXYGEN], doxygen)
             DX_REQUIRE_PROG([DX_PERL], perl)],
            [DX_ENV_APPEND(PERL_PATH, $DX_PERL)])

# Dot for graphics:
DX_ARG_ABLE(dot, [generate graphics for doxygen documentation],
            [DX_CHECK_DEPEND(doc, 1)],
            [DX_CLEAR_DEPEND(doc, 1)],
            [DX_REQUIRE_PROG([DX_DOT], dot)],
            [DX_ENV_APPEND(HAVE_DOT, YES)
             DX_ENV_APPEND(DOT_PATH, [`DX_DIRNAME_EXPR($DX_DOT)`])],
            [DX_ENV_APPEND(HAVE_DOT, NO)])

# Man pages generation:
DX_ARG_ABLE(man, [generate doxygen manual pages],
            [DX_CHECK_DEPEND(doc, 1)],
            [DX_CLEAR_DEPEND(doc, 1)],
            [],
            [DX_ENV_APPEND(GENERATE_MAN, YES)],
            [DX_ENV_APPEND(GENERATE_MAN, NO)])

# RTF file generation:
DX_ARG_ABLE(rtf, [generate doxygen RTF documentation],
            [DX_CHECK_DEPEND(doc, 1)],
            [DX_CLEAR_DEPEND(doc, 1)],
            [],
            [DX_ENV_APPEND(GENERATE_RTF, YES)],
            [DX_ENV_APPEND(GENERATE_RTF, NO)])

# XML file generation:
DX_ARG_ABLE(xml, [generate doxygen XML documentation],
            [DX_CHECK_DEPEND(doc, 1)],
            [DX_CLEAR_DEPEND(doc, 1)],
            [],
            [DX_ENV_APPEND(GENERATE_XML, YES)],
            [DX_ENV_APPEND(GENERATE_XML, NO)])

# (Compressed) HTML help generation:
DX_ARG_ABLE(chm, [generate doxygen compressed HTML help documentation],
            [DX_CHECK_DEPEND(doc, 1)],
            [DX_CLEAR_DEPEND(doc, 1)],
            [DX_REQUIRE_PROG([DX_HHC], hhc)],
            [DX_ENV_APPEND(HHC_PATH, $DX_HHC)
             DX_ENV_APPEND(GENERATE_HTML, YES)
             DX_ENV_APPEND(GENERATE_HTMLHELP, YES)],
            [DX_ENV_APPEND(GENERATE_HTMLHELP, NO)])

# Seperate CHI file generation.
DX_ARG_ABLE(chi, [generate doxygen seperate compressed HTML help index file],
            [DX_CHECK_DEPEND(chm, 1)],
            [DX_CLEAR_DEPEND(chm, 1)],
            [],
            [DX_ENV_APPEND(GENERATE_CHI, YES)],
            [DX_ENV_APPEND(GENERATE_CHI, NO)])

# Plain HTML pages generation:
DX_ARG_ABLE(html, [generate doxygen plain HTML documentation],
            [DX_CHECK_DEPEND(doc, 1) DX_CHECK_DEPEND(chm, 0)],
            [DX_CLEAR_DEPEND(doc, 1) DX_CLEAR_DEPEND(chm, 0)],
            [],
            [DX_ENV_APPEND(GENERATE_HTML, YES)],
            [DX_TEST_FEATURE(chm) || DX_ENV_APPEND(GENERATE_HTML, NO)])

# PostScript file generation:
DX_ARG_ABLE(ps, [generate doxygen PostScript documentation],
            [DX_CHECK_DEPEND(doc, 1)],
            [DX_CLEAR_DEPEND(doc, 1)],
            [DX_REQUIRE_PROG([DX_LATEX], latex)
             DX_REQUIRE_PROG([DX_MAKEINDEX], makeindex)
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#echo DX_FLAG_man=$DX_FLAG_man
#echo DX_FLAG_html=$DX_FLAG_html
#echo DX_FLAG_chm=$DX_FLAG_chm
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#echo DX_FLAG_xml=$DX_FLAG_xml
#echo DX_FLAG_pdf=$DX_FLAG_pdf
#echo DX_FLAG_ps=$DX_FLAG_ps
#echo DX_ENV=$DX_ENV
])

# Copyright (C) 2002-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_AUTOMAKE_VERSION(VERSION)
# ----------------------------
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# generated from the m4 files accompanying Automake X.Y.
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# Copyright (C) 2011-2013 Free Software Foundation, Inc.
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# AM_CONDITIONAL                                            -*- Autoconf -*-

# Copyright (C) 1997-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
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# Copyright (C) 1999-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
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# Generate code to set up dependency tracking.              -*- Autoconf -*-

# Copyright (C) 1999-2013 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# Do all the work for Automake.                             -*- Autoconf -*-

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AC_REQUIRE([AC_PROG_MAKE_SET])dnl
AC_REQUIRE([AM_SET_LEADING_DOT])dnl
_AM_IF_OPTION([tar-ustar], [_AM_PROG_TAR([ustar])],
	      [_AM_IF_OPTION([tar-pax], [_AM_PROG_TAR([pax])],
			     [_AM_PROG_TAR([v7])])])
_AM_IF_OPTION([no-dependencies],,
[AC_PROVIDE_IFELSE([AC_PROG_CC],
		  [_AM_DEPENDENCIES([CC])],
		  [m4_define([AC_PROG_CC],
			     m4_defn([AC_PROG_CC])[_AM_DEPENDENCIES([CC])])])dnl
AC_PROVIDE_IFELSE([AC_PROG_CXX],
		  [_AM_DEPENDENCIES([CXX])],
		  [m4_define([AC_PROG_CXX],
			     m4_defn([AC_PROG_CXX])[_AM_DEPENDENCIES([CXX])])])dnl
AC_PROVIDE_IFELSE([AC_PROG_OBJC],
		  [_AM_DEPENDENCIES([OBJC])],
		  [m4_define([AC_PROG_OBJC],
			     m4_defn([AC_PROG_OBJC])[_AM_DEPENDENCIES([OBJC])])])dnl
AC_PROVIDE_IFELSE([AC_PROG_OBJCXX],
		  [_AM_DEPENDENCIES([OBJCXX])],
		  [m4_define([AC_PROG_OBJCXX],
			     m4_defn([AC_PROG_OBJCXX])[_AM_DEPENDENCIES([OBJCXX])])])dnl
])
AC_REQUIRE([AM_SILENT_RULES])dnl
dnl The testsuite driver may need to know about EXEEXT, so add the
dnl 'am__EXEEXT' conditional if _AM_COMPILER_EXEEXT was seen.  This
dnl macro is hooked onto _AC_COMPILER_EXEEXT early, see below.
AC_CONFIG_COMMANDS_PRE(dnl
[m4_provide_if([_AM_COMPILER_EXEEXT],
  [AM_CONDITIONAL([am__EXEEXT], [test -n "$EXEEXT"])])])dnl
])

dnl Hook into '_AC_COMPILER_EXEEXT' early to learn its expansion.  Do not
dnl add the conditional right here, as _AC_COMPILER_EXEEXT may be further
dnl mangled by Autoconf and run in a shell conditional statement.
m4_define([_AC_COMPILER_EXEEXT],
m4_defn([_AC_COMPILER_EXEEXT])[m4_provide([_AM_COMPILER_EXEEXT])])


# When config.status generates a header, we must update the stamp-h file.
# This file resides in the same directory as the config header
# that is generated.  The stamp files are numbered to have different names.

# Autoconf calls _AC_AM_CONFIG_HEADER_HOOK (when defined) in the
# loop where config.status creates the headers, so we can generate
# our stamp files there.
AC_DEFUN([_AC_AM_CONFIG_HEADER_HOOK],
[# Compute $1's index in $config_headers.
_am_arg=$1
_am_stamp_count=1
for _am_header in $config_headers :; do
  case $_am_header in
    $_am_arg | $_am_arg:* )
      break ;;
    * )
      _am_stamp_count=`expr $_am_stamp_count + 1` ;;
  esac
done
echo "timestamp for $_am_arg" >`AS_DIRNAME(["$_am_arg"])`/stamp-h[]$_am_stamp_count])

# Copyright (C) 2001-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_PROG_INSTALL_SH
# ------------------
# Define $install_sh.
AC_DEFUN([AM_PROG_INSTALL_SH],
[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
if test x"${install_sh}" != xset; then
  case $am_aux_dir in
  *\ * | *\	*)
    install_sh="\${SHELL} '$am_aux_dir/install-sh'" ;;
  *)
    install_sh="\${SHELL} $am_aux_dir/install-sh"
  esac
fi
AC_SUBST([install_sh])])

# Copyright (C) 2003-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# Check whether the underlying file-system supports filenames
# with a leading dot.  For instance MS-DOS doesn't.
AC_DEFUN([AM_SET_LEADING_DOT],
[rm -rf .tst 2>/dev/null
mkdir .tst 2>/dev/null
if test -d .tst; then
  am__leading_dot=.
else
  am__leading_dot=_
fi
rmdir .tst 2>/dev/null
AC_SUBST([am__leading_dot])])

# Check to see how 'make' treats includes.	            -*- Autoconf -*-

# Copyright (C) 2001-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_MAKE_INCLUDE()
# -----------------
# Check to see how make treats includes.
AC_DEFUN([AM_MAKE_INCLUDE],
[am_make=${MAKE-make}
cat > confinc << 'END'
am__doit:
	@echo this is the am__doit target
.PHONY: am__doit
END
# If we don't find an include directive, just comment out the code.
AC_MSG_CHECKING([for style of include used by $am_make])
am__include="#"
am__quote=
_am_result=none
# First try GNU make style include.
echo "include confinc" > confmf
# Ignore all kinds of additional output from 'make'.
case `$am_make -s -f confmf 2> /dev/null` in #(
*the\ am__doit\ target*)
  am__include=include
  am__quote=
  _am_result=GNU
  ;;
esac
# Now try BSD make style include.
if test "$am__include" = "#"; then
   echo '.include "confinc"' > confmf
   case `$am_make -s -f confmf 2> /dev/null` in #(
   *the\ am__doit\ target*)
     am__include=.include
     am__quote="\""
     _am_result=BSD
     ;;
   esac
fi
AC_SUBST([am__include])
AC_SUBST([am__quote])
AC_MSG_RESULT([$_am_result])
rm -f confinc confmf
])

# Copyright (C) 1999-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_PROG_CC_C_O
# --------------
# Like AC_PROG_CC_C_O, but changed for automake.
AC_DEFUN([AM_PROG_CC_C_O],
[AC_REQUIRE([AC_PROG_CC_C_O])dnl
AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
AC_REQUIRE_AUX_FILE([compile])dnl
# FIXME: we rely on the cache variable name because
# there is no other way.
set dummy $CC
am_cc=`echo $[2] | sed ['s/[^a-zA-Z0-9_]/_/g;s/^[0-9]/_/']`
eval am_t=\$ac_cv_prog_cc_${am_cc}_c_o
if test "$am_t" != yes; then
   # Losing compiler, so override with the script.
   # FIXME: It is wrong to rewrite CC.
   # But if we don't then we get into trouble of one sort or another.
   # A longer-term fix would be to have automake use am__CC in this case,
   # and then we could set am__CC="\$(top_srcdir)/compile \$(CC)"
   CC="$am_aux_dir/compile $CC"
fi
dnl Make sure AC_PROG_CC is never called again, or it will override our
dnl setting of CC.
m4_define([AC_PROG_CC],
          [m4_fatal([AC_PROG_CC cannot be called after AM_PROG_CC_C_O])])
])

# Fake the existence of programs that GNU maintainers use.  -*- Autoconf -*-

# Copyright (C) 1997-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_MISSING_PROG(NAME, PROGRAM)
# ------------------------------
AC_DEFUN([AM_MISSING_PROG],
[AC_REQUIRE([AM_MISSING_HAS_RUN])
$1=${$1-"${am_missing_run}$2"}
AC_SUBST($1)])

# AM_MISSING_HAS_RUN
# ------------------
# Define MISSING if not defined so far and test if it is modern enough.
# If it is, set am_missing_run to use it, otherwise, to nothing.
AC_DEFUN([AM_MISSING_HAS_RUN],
[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
AC_REQUIRE_AUX_FILE([missing])dnl
if test x"${MISSING+set}" != xset; then
  case $am_aux_dir in
  *\ * | *\	*)
    MISSING="\${SHELL} \"$am_aux_dir/missing\"" ;;
  *)
    MISSING="\${SHELL} $am_aux_dir/missing" ;;
  esac
fi
# Use eval to expand $SHELL
if eval "$MISSING --is-lightweight"; then
  am_missing_run="$MISSING "
else
  am_missing_run=
  AC_MSG_WARN(['missing' script is too old or missing])
fi
])

# Helper functions for option handling.                     -*- Autoconf -*-

# Copyright (C) 2001-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# _AM_MANGLE_OPTION(NAME)
# -----------------------
AC_DEFUN([_AM_MANGLE_OPTION],
[[_AM_OPTION_]m4_bpatsubst($1, [[^a-zA-Z0-9_]], [_])])

# _AM_SET_OPTION(NAME)
# --------------------
# Set option NAME.  Presently that only means defining a flag for this option.
AC_DEFUN([_AM_SET_OPTION],
[m4_define(_AM_MANGLE_OPTION([$1]), [1])])

# _AM_SET_OPTIONS(OPTIONS)
# ------------------------
# OPTIONS is a space-separated list of Automake options.
AC_DEFUN([_AM_SET_OPTIONS],
[m4_foreach_w([_AM_Option], [$1], [_AM_SET_OPTION(_AM_Option)])])

# _AM_IF_OPTION(OPTION, IF-SET, [IF-NOT-SET])
# -------------------------------------------
# Execute IF-SET if OPTION is set, IF-NOT-SET otherwise.
AC_DEFUN([_AM_IF_OPTION],
[m4_ifset(_AM_MANGLE_OPTION([$1]), [$2], [$3])])

# Check to make sure that the build environment is sane.    -*- Autoconf -*-

# Copyright (C) 1996-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_SANITY_CHECK
# ---------------
AC_DEFUN([AM_SANITY_CHECK],
[AC_MSG_CHECKING([whether build environment is sane])
# Reject unsafe characters in $srcdir or the absolute working directory
# name.  Accept space and tab only in the latter.
am_lf='
'
case `pwd` in
  *[[\\\"\#\$\&\'\`$am_lf]]*)
    AC_MSG_ERROR([unsafe absolute working directory name]);;
esac
case $srcdir in
  *[[\\\"\#\$\&\'\`$am_lf\ \	]]*)
    AC_MSG_ERROR([unsafe srcdir value: '$srcdir']);;
esac

# Do 'set' in a subshell so we don't clobber the current shell's
# arguments.  Must try -L first in case configure is actually a
# symlink; some systems play weird games with the mod time of symlinks
# (eg FreeBSD returns the mod time of the symlink's containing
# directory).
if (
   am_has_slept=no
   for am_try in 1 2; do
     echo "timestamp, slept: $am_has_slept" > conftest.file
     set X `ls -Lt "$srcdir/configure" conftest.file 2> /dev/null`
     if test "$[*]" = "X"; then
	# -L didn't work.
	set X `ls -t "$srcdir/configure" conftest.file`
     fi
     if test "$[*]" != "X $srcdir/configure conftest.file" \
	&& test "$[*]" != "X conftest.file $srcdir/configure"; then

	# If neither matched, then we have a broken ls.  This can happen
	# if, for instance, CONFIG_SHELL is bash and it inherits a
	# broken ls alias from the environment.  This has actually
	# happened.  Such a system could not be considered "sane".
	AC_MSG_ERROR([ls -t appears to fail.  Make sure there is not a broken
  alias in your environment])
     fi
     if test "$[2]" = conftest.file || test $am_try -eq 2; then
       break
     fi
     # Just in case.
     sleep 1
     am_has_slept=yes
   done
   test "$[2]" = conftest.file
   )
then
   # Ok.
   :
else
   AC_MSG_ERROR([newly created file is older than distributed files!
Check your system clock])
fi
AC_MSG_RESULT([yes])
# If we didn't sleep, we still need to ensure time stamps of config.status and
# generated files are strictly newer.
am_sleep_pid=
if grep 'slept: no' conftest.file >/dev/null 2>&1; then
  ( sleep 1 ) &
  am_sleep_pid=$!
fi
AC_CONFIG_COMMANDS_PRE(
  [AC_MSG_CHECKING([that generated files are newer than configure])
   if test -n "$am_sleep_pid"; then
     # Hide warnings about reused PIDs.
     wait $am_sleep_pid 2>/dev/null
   fi
   AC_MSG_RESULT([done])])
rm -f conftest.file
])

# Copyright (C) 2009-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_SILENT_RULES([DEFAULT])
# --------------------------
# Enable less verbose build rules; with the default set to DEFAULT
# ("yes" being less verbose, "no" or empty being verbose).
AC_DEFUN([AM_SILENT_RULES],
[AC_ARG_ENABLE([silent-rules], [dnl
AS_HELP_STRING(
  [--enable-silent-rules],
  [less verbose build output (undo: "make V=1")])
AS_HELP_STRING(
  [--disable-silent-rules],
  [verbose build output (undo: "make V=0")])dnl
])
case $enable_silent_rules in @%:@ (((
  yes) AM_DEFAULT_VERBOSITY=0;;
   no) AM_DEFAULT_VERBOSITY=1;;
    *) AM_DEFAULT_VERBOSITY=m4_if([$1], [yes], [0], [1]);;
esac
dnl
dnl A few 'make' implementations (e.g., NonStop OS and NextStep)
dnl do not support nested variable expansions.
dnl See automake bug#9928 and bug#10237.
am_make=${MAKE-make}
AC_CACHE_CHECK([whether $am_make supports nested variables],
   [am_cv_make_support_nested_variables],
   [if AS_ECHO([['TRUE=$(BAR$(V))
BAR0=false
BAR1=true
V=1
am__doit:
	@$(TRUE)
.PHONY: am__doit']]) | $am_make -f - >/dev/null 2>&1; then
  am_cv_make_support_nested_variables=yes
else
  am_cv_make_support_nested_variables=no
fi])
if test $am_cv_make_support_nested_variables = yes; then
  dnl Using '$V' instead of '$(V)' breaks IRIX make.
  AM_V='$(V)'
  AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'
else
  AM_V=$AM_DEFAULT_VERBOSITY
  AM_DEFAULT_V=$AM_DEFAULT_VERBOSITY
fi
AC_SUBST([AM_V])dnl
AM_SUBST_NOTMAKE([AM_V])dnl
AC_SUBST([AM_DEFAULT_V])dnl
AM_SUBST_NOTMAKE([AM_DEFAULT_V])dnl
AC_SUBST([AM_DEFAULT_VERBOSITY])dnl
AM_BACKSLASH='\'
AC_SUBST([AM_BACKSLASH])dnl
_AM_SUBST_NOTMAKE([AM_BACKSLASH])dnl
])

# Copyright (C) 2001-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_PROG_INSTALL_STRIP
# ---------------------
# One issue with vendor 'install' (even GNU) is that you can't
# specify the program used to strip binaries.  This is especially
# annoying in cross-compiling environments, where the build's strip
# is unlikely to handle the host's binaries.
# Fortunately install-sh will honor a STRIPPROG variable, so we
# always use install-sh in "make install-strip", and initialize
# STRIPPROG with the value of the STRIP variable (set by the user).
AC_DEFUN([AM_PROG_INSTALL_STRIP],
[AC_REQUIRE([AM_PROG_INSTALL_SH])dnl
# Installed binaries are usually stripped using 'strip' when the user
# run "make install-strip".  However 'strip' might not be the right
# tool to use in cross-compilation environments, therefore Automake
# will honor the 'STRIP' environment variable to overrule this program.
dnl Don't test for $cross_compiling = yes, because it might be 'maybe'.
if test "$cross_compiling" != no; then
  AC_CHECK_TOOL([STRIP], [strip], :)
fi
INSTALL_STRIP_PROGRAM="\$(install_sh) -c -s"
AC_SUBST([INSTALL_STRIP_PROGRAM])])

# Copyright (C) 2006-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# _AM_SUBST_NOTMAKE(VARIABLE)
# ---------------------------
# Prevent Automake from outputting VARIABLE = @VARIABLE@ in Makefile.in.
# This macro is traced by Automake.
AC_DEFUN([_AM_SUBST_NOTMAKE])

# AM_SUBST_NOTMAKE(VARIABLE)
# --------------------------
# Public sister of _AM_SUBST_NOTMAKE.
AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])

# Check how to create a tarball.                            -*- Autoconf -*-

# Copyright (C) 2004-2013 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# _AM_PROG_TAR(FORMAT)
# --------------------
# Check how to create a tarball in format FORMAT.
# FORMAT should be one of 'v7', 'ustar', or 'pax'.
#
# Substitute a variable $(am__tar) that is a command
# writing to stdout a FORMAT-tarball containing the directory
# $tardir.
#     tardir=directory && $(am__tar) > result.tar
#
# Substitute a variable $(am__untar) that extract such
# a tarball read from stdin.
#     $(am__untar) < result.tar
#
AC_DEFUN([_AM_PROG_TAR],
[# Always define AMTAR for backward compatibility.  Yes, it's still used
# in the wild :-(  We should find a proper way to deprecate it ...
AC_SUBST([AMTAR], ['$${TAR-tar}'])

# We'll loop over all known methods to create a tar archive until one works.
_am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'

m4_if([$1], [v7],
  [am__tar='$${TAR-tar} chof - "$$tardir"' am__untar='$${TAR-tar} xf -'],

  [m4_case([$1],
    [ustar],
     [# The POSIX 1988 'ustar' format is defined with fixed-size fields.
      # There is notably a 21 bits limit for the UID and the GID.  In fact,
      # the 'pax' utility can hang on bigger UID/GID (see automake bug#8343
      # and bug#13588).
      am_max_uid=2097151 # 2^21 - 1
      am_max_gid=$am_max_uid
      # The $UID and $GID variables are not portable, so we need to resort
      # to the POSIX-mandated id(1) utility.  Errors in the 'id' calls
      # below are definitely unexpected, so allow the users to see them
      # (that is, avoid stderr redirection).
      am_uid=`id -u || echo unknown`
      am_gid=`id -g || echo unknown`
      AC_MSG_CHECKING([whether UID '$am_uid' is supported by ustar format])
      if test $am_uid -le $am_max_uid; then
         AC_MSG_RESULT([yes])
      else
         AC_MSG_RESULT([no])
         _am_tools=none
      fi
      AC_MSG_CHECKING([whether GID '$am_gid' is supported by ustar format])
      if test $am_gid -le $am_max_gid; then
         AC_MSG_RESULT([yes])
      else
        AC_MSG_RESULT([no])
        _am_tools=none
      fi],

  [pax],
    [],

  [m4_fatal([Unknown tar format])])

  AC_MSG_CHECKING([how to create a $1 tar archive])

  # Go ahead even if we have the value already cached.  We do so because we
  # need to set the values for the 'am__tar' and 'am__untar' variables.
  _am_tools=${am_cv_prog_tar_$1-$_am_tools}

  for _am_tool in $_am_tools; do
    case $_am_tool in
    gnutar)
      for _am_tar in tar gnutar gtar; do
        AM_RUN_LOG([$_am_tar --version]) && break
      done
      am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"'
      am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"'
      am__untar="$_am_tar -xf -"
      ;;
    plaintar)
      # Must skip GNU tar: if it does not support --format= it doesn't create
      # ustar tarball either.
      (tar --version) >/dev/null 2>&1 && continue
      am__tar='tar chf - "$$tardir"'
      am__tar_='tar chf - "$tardir"'
      am__untar='tar xf -'
      ;;
    pax)
      am__tar='pax -L -x $1 -w "$$tardir"'
      am__tar_='pax -L -x $1 -w "$tardir"'
      am__untar='pax -r'
      ;;
    cpio)
      am__tar='find "$$tardir" -print | cpio -o -H $1 -L'
      am__tar_='find "$tardir" -print | cpio -o -H $1 -L'
      am__untar='cpio -i -H $1 -d'
      ;;
    none)
      am__tar=false
      am__tar_=false
      am__untar=false
      ;;
    esac

    # If the value was cached, stop now.  We just wanted to have am__tar
    # and am__untar set.
    test -n "${am_cv_prog_tar_$1}" && break

    # tar/untar a dummy directory, and stop if the command works.
    rm -rf conftest.dir
    mkdir conftest.dir
    echo GrepMe > conftest.dir/file
    AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar])
    rm -rf conftest.dir
    if test -s conftest.tar; then
      AM_RUN_LOG([$am__untar <conftest.tar])
      AM_RUN_LOG([cat conftest.dir/file])
      grep GrepMe conftest.dir/file >/dev/null 2>&1 && break
    fi
  done
  rm -rf conftest.dir

  AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])
  AC_MSG_RESULT([$am_cv_prog_tar_$1])])

AC_SUBST([am__tar])
AC_SUBST([am__untar])
]) # _AM_PROG_TAR