m4/ax_prog_doxygen.m4 - oransc/ric-plt/sdl - Gitiles

 # ===========================================================================
 #     https://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 separate .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 '$(srcdir)/Doxyfile', the same as Doxygen's default), and an
 #   optional output directory name (the default is 'doxygen-doc'). To run
 #   doxygen multiple times for different configuration files and output
 #   directories provide more parameters: the second, forth, sixth, etc
 #   parameter are configuration file names and the third, fifth, seventh,
 #   etc parameter are output directories. No checking is done to catch
 #   duplicates.
 #
 #   Automake Support
 #
 #   The DX_RULES substitution can be used to add all needed rules to the
 #   Makefile. Note that this is a substitution without being a variable:
 #   only the @DX_RULES@ syntax will work.
 #
 #   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).
 #
 #     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.
 #
 # LICENSE
 #
 #   Copyright (c) 2009 Oren Ben-Kiki <oren@ben-kiki.org>
 #   Copyright (c) 2015 Olaf Mandel <olaf@mandel.name>
 #
 #   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 23

 ## ----------##
 ## Defaults. ##
 ## ----------##

 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)

 ## --------------- ##
 ## Private macros. ##
 ## --------------- ##

 # DX_ENV_APPEND(VARIABLE, VALUE)
 # ------------------------------
 # Append VARIABLE="VALUE" to DX_ENV for invoking doxygen and add it
 # as a substitution (but not a Makefile variable). The substitution
 # is skipped if the variable name is VERSION.
 AC_DEFUN([DX_ENV_APPEND],
 [AC_SUBST([DX_ENV], ["$DX_ENV $1='$2'"])dnl
 m4_if([$1], [VERSION], [], [AC_SUBST([$1], [$2])dnl
 AM_SUBST_NOTMAKE([$1])])dnl
 ])

 # 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
 if DX_TEST_FEATURE([$1]); then
     $6
     :
 else
     $7
     :
 fi
 ])

 ## -------------- ##
 ## Public macros. ##
 ## -------------- ##

 # 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 "$(srcdir)/Doxyfile" and OUTPUT-DOC-DIR is
 # "doxygen-doc".
 # More arguments are interpreted as interleaved CONFIG-FILE and
 # OUTPUT-DOC-DIR values.
 AC_DEFUN([DX_INIT_DOXYGEN], [

 # Files:
 AC_SUBST([DX_PROJECT], [$1])
 AC_SUBST([DX_CONFIG], ['ifelse([$2], [], [$(srcdir)/Doxyfile], [$2])'])
 AC_SUBST([DX_DOCDIR], ['ifelse([$3], [], [doxygen-doc], [$3])'])
 m4_if(m4_eval(3 < m4_count($@)), 1, [m4_for([DX_i], 4, m4_count($@), 2,
       [AC_SUBST([DX_CONFIG]m4_eval(DX_i[/2]),
                 'm4_default_nblank_quoted(m4_argn(DX_i, $@),
                                           [$(srcdir)/Doxyfile])')])])dnl
 m4_if(m4_eval(3 < m4_count($@)), 1, [m4_for([DX_i], 5, m4_count($@,), 2,
       [AC_SUBST([DX_DOCDIR]m4_eval([(]DX_i[-1)/2]),
                 'm4_default_nblank_quoted(m4_argn(DX_i, $@),
                                           [doxygen-doc])')])])dnl
 m4_define([DX_loop], m4_dquote(m4_if(m4_eval(3 < m4_count($@)), 1,
           [m4_for([DX_i], 4, m4_count($@), 2, [, m4_eval(DX_i[/2])])],
           [])))dnl

 # Environment variables used inside doxygen.cfg:
 DX_ENV_APPEND(SRCDIR, $srcdir)
 DX_ENV_APPEND(PROJECT, $DX_PROJECT)
 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)])

 # Separate CHI file generation.
 DX_ARG_ABLE(chi, [generate doxygen separate 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)
              DX_REQUIRE_PROG([DX_DVIPS], dvips)
              DX_REQUIRE_PROG([DX_EGREP], egrep)])

 # PDF file generation:
 DX_ARG_ABLE(pdf, [generate doxygen PDF documentation],
             [DX_CHECK_DEPEND(doc, 1)],
             [DX_CLEAR_DEPEND(doc, 1)],
             [DX_REQUIRE_PROG([DX_PDFLATEX], pdflatex)
              DX_REQUIRE_PROG([DX_MAKEINDEX], makeindex)
              DX_REQUIRE_PROG([DX_EGREP], egrep)])

 # LaTeX generation for PS and/or PDF:
 if DX_TEST_FEATURE(ps) || DX_TEST_FEATURE(pdf); then
     DX_ENV_APPEND(GENERATE_LATEX, YES)
 else
     DX_ENV_APPEND(GENERATE_LATEX, NO)
 fi

 # Paper size for PS and/or PDF:
 AC_ARG_VAR(DOXYGEN_PAPER_SIZE,
            [a4wide (default), a4, letter, legal or executive])
 case "$DOXYGEN_PAPER_SIZE" in
 #(
 "")
     AC_SUBST(DOXYGEN_PAPER_SIZE, "")
 ;; #(
 a4wide|a4|letter|legal|executive)
     DX_ENV_APPEND(PAPER_SIZE, $DOXYGEN_PAPER_SIZE)
 ;; #(
 *)
     AC_MSG_ERROR([unknown DOXYGEN_PAPER_SIZE='$DOXYGEN_PAPER_SIZE'])
 ;;
 esac

 # Rules:
 AS_IF([[test $DX_FLAG_html -eq 1]],
 [[DX_SNIPPET_html="## ------------------------------- ##
 ## Rules specific for HTML output. ##
 ## ------------------------------- ##

 DX_CLEAN_HTML = \$(DX_DOCDIR)/html]dnl
 m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
                 \$(DX_DOCDIR]DX_i[)/html]])[

 "]],
 [[DX_SNIPPET_html=""]])
 AS_IF([[test $DX_FLAG_chi -eq 1]],
 [[DX_SNIPPET_chi="
 DX_CLEAN_CHI = \$(DX_DOCDIR)/\$(PACKAGE).chi]dnl
 m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
                \$(DX_DOCDIR]DX_i[)/\$(PACKAGE).chi]])["]],
 [[DX_SNIPPET_chi=""]])
 AS_IF([[test $DX_FLAG_chm -eq 1]],
 [[DX_SNIPPET_chm="## ------------------------------ ##
 ## Rules specific for CHM output. ##
 ## ------------------------------ ##

 DX_CLEAN_CHM = \$(DX_DOCDIR)/chm]dnl
 m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
                \$(DX_DOCDIR]DX_i[)/chm]])[\
 ${DX_SNIPPET_chi}

 "]],
 [[DX_SNIPPET_chm=""]])
 AS_IF([[test $DX_FLAG_man -eq 1]],
 [[DX_SNIPPET_man="## ------------------------------ ##
 ## Rules specific for MAN output. ##
 ## ------------------------------ ##

 DX_CLEAN_MAN = \$(DX_DOCDIR)/man]dnl
 m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
                \$(DX_DOCDIR]DX_i[)/man]])[

 "]],
 [[DX_SNIPPET_man=""]])
 AS_IF([[test $DX_FLAG_rtf -eq 1]],
 [[DX_SNIPPET_rtf="## ------------------------------ ##
 ## Rules specific for RTF output. ##
 ## ------------------------------ ##

 DX_CLEAN_RTF = \$(DX_DOCDIR)/rtf]dnl
 m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
                \$(DX_DOCDIR]DX_i[)/rtf]])[

 "]],
 [[DX_SNIPPET_rtf=""]])
 AS_IF([[test $DX_FLAG_xml -eq 1]],
 [[DX_SNIPPET_xml="## ------------------------------ ##
 ## Rules specific for XML output. ##
 ## ------------------------------ ##

 DX_CLEAN_XML = \$(DX_DOCDIR)/xml]dnl
 m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
                \$(DX_DOCDIR]DX_i[)/xml]])[

 "]],
 [[DX_SNIPPET_xml=""]])
 AS_IF([[test $DX_FLAG_ps -eq 1]],
 [[DX_SNIPPET_ps="## ----------------------------- ##
 ## Rules specific for PS output. ##
 ## ----------------------------- ##

 DX_CLEAN_PS = \$(DX_DOCDIR)/\$(PACKAGE).ps]dnl
 m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
               \$(DX_DOCDIR]DX_i[)/\$(PACKAGE).ps]])[

 DX_PS_GOAL = doxygen-ps

 doxygen-ps: \$(DX_CLEAN_PS)

 ]m4_foreach([DX_i], [DX_loop],
 [[\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).ps: \$(DX_DOCDIR]DX_i[)/\$(PACKAGE).tag
 	\$(DX_V_LATEX)cd \$(DX_DOCDIR]DX_i[)/latex; \\
 	rm -f *.aux *.toc *.idx *.ind *.ilg *.log *.out; \\
 	\$(DX_LATEX) refman.tex; \\
 	\$(DX_MAKEINDEX) 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

 ]])["]],
 [[DX_SNIPPET_ps=""]])
 AS_IF([[test $DX_FLAG_pdf -eq 1]],
 [[DX_SNIPPET_pdf="## ------------------------------ ##
 ## Rules specific for PDF output. ##
 ## ------------------------------ ##

 DX_CLEAN_PDF = \$(DX_DOCDIR)/\$(PACKAGE).pdf]dnl
 m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
                \$(DX_DOCDIR]DX_i[)/\$(PACKAGE).pdf]])[

 DX_PDF_GOAL = doxygen-pdf

 doxygen-pdf: \$(DX_CLEAN_PDF)

 ]m4_foreach([DX_i], [DX_loop],
 [[\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).pdf: \$(DX_DOCDIR]DX_i[)/\$(PACKAGE).tag
 	\$(DX_V_LATEX)cd \$(DX_DOCDIR]DX_i[)/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

 ]])["]],
 [[DX_SNIPPET_pdf=""]])
 AS_IF([[test $DX_FLAG_ps -eq 1 -o $DX_FLAG_pdf -eq 1]],
 [[DX_SNIPPET_latex="## ------------------------------------------------- ##
 ## Rules specific for LaTeX (shared for PS and PDF). ##
 ## ------------------------------------------------- ##

 DX_V_LATEX = \$(_DX_v_LATEX_\$(V))
 _DX_v_LATEX_ = \$(_DX_v_LATEX_\$(AM_DEFAULT_VERBOSITY))
 _DX_v_LATEX_0 = @echo \"  LATEX \" \$][@;

 DX_CLEAN_LATEX = \$(DX_DOCDIR)/latex]dnl
 m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
                  \$(DX_DOCDIR]DX_i[)/latex]])[

 "]],
 [[DX_SNIPPET_latex=""]])

 AS_IF([[test $DX_FLAG_doc -eq 1]],
 [[DX_SNIPPET_doc="## --------------------------------- ##
 ## Format-independent Doxygen rules. ##
 ## --------------------------------- ##

 ${DX_SNIPPET_html}\
 ${DX_SNIPPET_chm}\
 ${DX_SNIPPET_man}\
 ${DX_SNIPPET_rtf}\
 ${DX_SNIPPET_xml}\
 ${DX_SNIPPET_ps}\
 ${DX_SNIPPET_pdf}\
 ${DX_SNIPPET_latex}\
 DX_V_DXGEN = \$(_DX_v_DXGEN_\$(V))
 _DX_v_DXGEN_ = \$(_DX_v_DXGEN_\$(AM_DEFAULT_VERBOSITY))
 _DX_v_DXGEN_0 = @echo \"  DXGEN \" \$<;

 .PHONY: doxygen-run doxygen-doc \$(DX_PS_GOAL) \$(DX_PDF_GOAL)

 .INTERMEDIATE: doxygen-run \$(DX_PS_GOAL) \$(DX_PDF_GOAL)

 doxygen-run:]m4_foreach([DX_i], [DX_loop],
                          [[ \$(DX_DOCDIR]DX_i[)/\$(PACKAGE).tag]])[

 doxygen-doc: doxygen-run \$(DX_PS_GOAL) \$(DX_PDF_GOAL)

 ]m4_foreach([DX_i], [DX_loop],
 [[\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).tag: \$(DX_CONFIG]DX_i[) \$(pkginclude_HEADERS)
 	\$(A""M_V_at)rm -rf \$(DX_DOCDIR]DX_i[)
 	\$(DX_V_DXGEN)\$(DX_ENV) DOCDIR=\$(DX_DOCDIR]DX_i[) \$(DX_DOXYGEN) \$(DX_CONFIG]DX_i[)
 	\$(A""M_V_at)echo Timestamp >\$][@

 ]])dnl
 [DX_CLEANFILES = \\]
 m4_foreach([DX_i], [DX_loop],
 [[	\$(DX_DOCDIR]DX_i[)/doxygen_sqlite3.db \\
 	\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).tag \\
 ]])dnl
 [	-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)"]],
 [[DX_SNIPPET_doc=""]])
 AC_SUBST([DX_RULES],
 ["${DX_SNIPPET_doc}"])dnl
 AM_SUBST_NOTMAKE([DX_RULES])

 #For debugging:
 #echo DX_FLAG_doc=$DX_FLAG_doc
 #echo DX_FLAG_dot=$DX_FLAG_dot
 #echo DX_FLAG_man=$DX_FLAG_man
 #echo DX_FLAG_html=$DX_FLAG_html
 #echo DX_FLAG_chm=$DX_FLAG_chm
 #echo DX_FLAG_chi=$DX_FLAG_chi
 #echo DX_FLAG_rtf=$DX_FLAG_rtf
 #echo DX_FLAG_xml=$DX_FLAG_xml
 #echo DX_FLAG_pdf=$DX_FLAG_pdf
 #echo DX_FLAG_ps=$DX_FLAG_ps
 #echo DX_ENV=$DX_ENV
 ])
	# ===========================================================================
	# https://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 separate .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 '$(srcdir)/Doxyfile', the same as Doxygen's default), and an
	# optional output directory name (the default is 'doxygen-doc'). To run
	# doxygen multiple times for different configuration files and output
	# directories provide more parameters: the second, forth, sixth, etc
	# parameter are configuration file names and the third, fifth, seventh,
	# etc parameter are output directories. No checking is done to catch
	# duplicates.
	#
	# Automake Support
	#
	# The DX_RULES substitution can be used to add all needed rules to the
	# Makefile. Note that this is a substitution without being a variable:
	# only the @DX_RULES@ syntax will work.
	#
	# 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).
	#
	# 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.
	#
	# LICENSE
	#
	# Copyright (c) 2009 Oren Ben-Kiki <oren@ben-kiki.org>
	# Copyright (c) 2015 Olaf Mandel <olaf@mandel.name>
	#
	# 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 23

	## ----------##
	## Defaults. ##
	## ----------##

	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)

	## --------------- ##
	## Private macros. ##
	## --------------- ##

	# DX_ENV_APPEND(VARIABLE, VALUE)
	# ------------------------------
	# Append VARIABLE="VALUE" to DX_ENV for invoking doxygen and add it
	# as a substitution (but not a Makefile variable). The substitution
	# is skipped if the variable name is VERSION.
	AC_DEFUN([DX_ENV_APPEND],
	[AC_SUBST([DX_ENV], ["$DX_ENV $1='$2'"])dnl
	m4_if([$1], [VERSION], [], [AC_SUBST([$1], [$2])dnl
	AM_SUBST_NOTMAKE([$1])])dnl
	])

	# 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
	if DX_TEST_FEATURE([$1]); then
	$6
	:
	else
	$7
	:
	fi
	])

	## -------------- ##
	## Public macros. ##
	## -------------- ##

	# 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 "$(srcdir)/Doxyfile" and OUTPUT-DOC-DIR is
	# "doxygen-doc".
	# More arguments are interpreted as interleaved CONFIG-FILE and
	# OUTPUT-DOC-DIR values.
	AC_DEFUN([DX_INIT_DOXYGEN], [

	# Files:
	AC_SUBST([DX_PROJECT], [$1])
	AC_SUBST([DX_CONFIG], ['ifelse([$2], [], [$(srcdir)/Doxyfile], [$2])'])
	AC_SUBST([DX_DOCDIR], ['ifelse([$3], [], [doxygen-doc], [$3])'])
	m4_if(m4_eval(3 < m4_count($@)), 1, [m4_for([DX_i], 4, m4_count($@), 2,
	[AC_SUBST([DX_CONFIG]m4_eval(DX_i[/2]),
	'm4_default_nblank_quoted(m4_argn(DX_i, $@),
	[$(srcdir)/Doxyfile])')])])dnl
	m4_if(m4_eval(3 < m4_count($@)), 1, [m4_for([DX_i], 5, m4_count($@,), 2,
	[AC_SUBST([DX_DOCDIR]m4_eval([(]DX_i[-1)/2]),
	'm4_default_nblank_quoted(m4_argn(DX_i, $@),
	[doxygen-doc])')])])dnl
	m4_define([DX_loop], m4_dquote(m4_if(m4_eval(3 < m4_count($@)), 1,
	[m4_for([DX_i], 4, m4_count($@), 2, [, m4_eval(DX_i[/2])])],
	[])))dnl

	# Environment variables used inside doxygen.cfg:
	DX_ENV_APPEND(SRCDIR, $srcdir)
	DX_ENV_APPEND(PROJECT, $DX_PROJECT)
	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)])

	# Separate CHI file generation.
	DX_ARG_ABLE(chi, [generate doxygen separate 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)
	DX_REQUIRE_PROG([DX_DVIPS], dvips)
	DX_REQUIRE_PROG([DX_EGREP], egrep)])

	# PDF file generation:
	DX_ARG_ABLE(pdf, [generate doxygen PDF documentation],
	[DX_CHECK_DEPEND(doc, 1)],
	[DX_CLEAR_DEPEND(doc, 1)],
	[DX_REQUIRE_PROG([DX_PDFLATEX], pdflatex)
	DX_REQUIRE_PROG([DX_MAKEINDEX], makeindex)
	DX_REQUIRE_PROG([DX_EGREP], egrep)])

	# LaTeX generation for PS and/or PDF:
	if DX_TEST_FEATURE(ps) \|\| DX_TEST_FEATURE(pdf); then
	DX_ENV_APPEND(GENERATE_LATEX, YES)
	else
	DX_ENV_APPEND(GENERATE_LATEX, NO)
	fi

	# Paper size for PS and/or PDF:
	AC_ARG_VAR(DOXYGEN_PAPER_SIZE,
	[a4wide (default), a4, letter, legal or executive])
	case "$DOXYGEN_PAPER_SIZE" in
	#(
	"")
	AC_SUBST(DOXYGEN_PAPER_SIZE, "")
	;; #(
	a4wide\|a4\|letter\|legal\|executive)
	DX_ENV_APPEND(PAPER_SIZE, $DOXYGEN_PAPER_SIZE)
	;; #(
	*)
	AC_MSG_ERROR([unknown DOXYGEN_PAPER_SIZE='$DOXYGEN_PAPER_SIZE'])
	;;
	esac

	# Rules:
	AS_IF([[test $DX_FLAG_html -eq 1]],
	[[DX_SNIPPET_html="## ------------------------------- ##
	## Rules specific for HTML output. ##
	## ------------------------------- ##

	DX_CLEAN_HTML = \$(DX_DOCDIR)/html]dnl
	m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
	\$(DX_DOCDIR]DX_i[)/html]])[

	"]],
	[[DX_SNIPPET_html=""]])
	AS_IF([[test $DX_FLAG_chi -eq 1]],
	[[DX_SNIPPET_chi="
	DX_CLEAN_CHI = \$(DX_DOCDIR)/\$(PACKAGE).chi]dnl
	m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
	\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).chi]])["]],
	[[DX_SNIPPET_chi=""]])
	AS_IF([[test $DX_FLAG_chm -eq 1]],
	[[DX_SNIPPET_chm="## ------------------------------ ##
	## Rules specific for CHM output. ##
	## ------------------------------ ##

	DX_CLEAN_CHM = \$(DX_DOCDIR)/chm]dnl
	m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
	\$(DX_DOCDIR]DX_i[)/chm]])[\
	${DX_SNIPPET_chi}

	"]],
	[[DX_SNIPPET_chm=""]])
	AS_IF([[test $DX_FLAG_man -eq 1]],
	[[DX_SNIPPET_man="## ------------------------------ ##
	## Rules specific for MAN output. ##
	## ------------------------------ ##

	DX_CLEAN_MAN = \$(DX_DOCDIR)/man]dnl
	m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
	\$(DX_DOCDIR]DX_i[)/man]])[

	"]],
	[[DX_SNIPPET_man=""]])
	AS_IF([[test $DX_FLAG_rtf -eq 1]],
	[[DX_SNIPPET_rtf="## ------------------------------ ##
	## Rules specific for RTF output. ##
	## ------------------------------ ##

	DX_CLEAN_RTF = \$(DX_DOCDIR)/rtf]dnl
	m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
	\$(DX_DOCDIR]DX_i[)/rtf]])[

	"]],
	[[DX_SNIPPET_rtf=""]])
	AS_IF([[test $DX_FLAG_xml -eq 1]],
	[[DX_SNIPPET_xml="## ------------------------------ ##
	## Rules specific for XML output. ##
	## ------------------------------ ##

	DX_CLEAN_XML = \$(DX_DOCDIR)/xml]dnl
	m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
	\$(DX_DOCDIR]DX_i[)/xml]])[

	"]],
	[[DX_SNIPPET_xml=""]])
	AS_IF([[test $DX_FLAG_ps -eq 1]],
	[[DX_SNIPPET_ps="## ----------------------------- ##
	## Rules specific for PS output. ##
	## ----------------------------- ##

	DX_CLEAN_PS = \$(DX_DOCDIR)/\$(PACKAGE).ps]dnl
	m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
	\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).ps]])[

	DX_PS_GOAL = doxygen-ps

	doxygen-ps: \$(DX_CLEAN_PS)

	]m4_foreach([DX_i], [DX_loop],
	[[\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).ps: \$(DX_DOCDIR]DX_i[)/\$(PACKAGE).tag
	\$(DX_V_LATEX)cd \$(DX_DOCDIR]DX_i[)/latex; \\
	rm -f .aux .toc .idx .ind .ilg .log *.out; \\
	\$(DX_LATEX) refman.tex; \\
	\$(DX_MAKEINDEX) 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

	]])["]],
	[[DX_SNIPPET_ps=""]])
	AS_IF([[test $DX_FLAG_pdf -eq 1]],
	[[DX_SNIPPET_pdf="## ------------------------------ ##
	## Rules specific for PDF output. ##
	## ------------------------------ ##

	DX_CLEAN_PDF = \$(DX_DOCDIR)/\$(PACKAGE).pdf]dnl
	m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
	\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).pdf]])[

	DX_PDF_GOAL = doxygen-pdf

	doxygen-pdf: \$(DX_CLEAN_PDF)

	]m4_foreach([DX_i], [DX_loop],
	[[\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).pdf: \$(DX_DOCDIR]DX_i[)/\$(PACKAGE).tag
	\$(DX_V_LATEX)cd \$(DX_DOCDIR]DX_i[)/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

	]])["]],
	[[DX_SNIPPET_pdf=""]])
	AS_IF([[test $DX_FLAG_ps -eq 1 -o $DX_FLAG_pdf -eq 1]],
	[[DX_SNIPPET_latex="## ------------------------------------------------- ##
	## Rules specific for LaTeX (shared for PS and PDF). ##
	## ------------------------------------------------- ##

	DX_V_LATEX = \$(_DX_v_LATEX_\$(V))
	_DX_v_LATEX_ = \$(_DX_v_LATEX_\$(AM_DEFAULT_VERBOSITY))
	_DX_v_LATEX_0 = @echo \" LATEX \" \$][@;

	DX_CLEAN_LATEX = \$(DX_DOCDIR)/latex]dnl
	m4_foreach([DX_i], [m4_shift(DX_loop)], [[\\
	\$(DX_DOCDIR]DX_i[)/latex]])[

	"]],
	[[DX_SNIPPET_latex=""]])

	AS_IF([[test $DX_FLAG_doc -eq 1]],
	[[DX_SNIPPET_doc="## --------------------------------- ##
	## Format-independent Doxygen rules. ##
	## --------------------------------- ##

	${DX_SNIPPET_html}\
	${DX_SNIPPET_chm}\
	${DX_SNIPPET_man}\
	${DX_SNIPPET_rtf}\
	${DX_SNIPPET_xml}\
	${DX_SNIPPET_ps}\
	${DX_SNIPPET_pdf}\
	${DX_SNIPPET_latex}\
	DX_V_DXGEN = \$(_DX_v_DXGEN_\$(V))
	_DX_v_DXGEN_ = \$(_DX_v_DXGEN_\$(AM_DEFAULT_VERBOSITY))
	_DX_v_DXGEN_0 = @echo \" DXGEN \" \$<;

	.PHONY: doxygen-run doxygen-doc \$(DX_PS_GOAL) \$(DX_PDF_GOAL)

	.INTERMEDIATE: doxygen-run \$(DX_PS_GOAL) \$(DX_PDF_GOAL)

	doxygen-run:]m4_foreach([DX_i], [DX_loop],
	[[ \$(DX_DOCDIR]DX_i[)/\$(PACKAGE).tag]])[

	doxygen-doc: doxygen-run \$(DX_PS_GOAL) \$(DX_PDF_GOAL)

	]m4_foreach([DX_i], [DX_loop],
	[[\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).tag: \$(DX_CONFIG]DX_i[) \$(pkginclude_HEADERS)
	\$(A""M_V_at)rm -rf \$(DX_DOCDIR]DX_i[)
	\$(DX_V_DXGEN)\$(DX_ENV) DOCDIR=\$(DX_DOCDIR]DX_i[) \$(DX_DOXYGEN) \$(DX_CONFIG]DX_i[)
	\$(A""M_V_at)echo Timestamp >\$][@

	]])dnl
	[DX_CLEANFILES = \\]
	m4_foreach([DX_i], [DX_loop],
	[[ \$(DX_DOCDIR]DX_i[)/doxygen_sqlite3.db \\
	\$(DX_DOCDIR]DX_i[)/\$(PACKAGE).tag \\
	]])dnl
	[ -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)"]],
	[[DX_SNIPPET_doc=""]])
	AC_SUBST([DX_RULES],
	["${DX_SNIPPET_doc}"])dnl
	AM_SUBST_NOTMAKE([DX_RULES])

	#For debugging:
	#echo DX_FLAG_doc=$DX_FLAG_doc
	#echo DX_FLAG_dot=$DX_FLAG_dot
	#echo DX_FLAG_man=$DX_FLAG_man
	#echo DX_FLAG_html=$DX_FLAG_html
	#echo DX_FLAG_chm=$DX_FLAG_chm
	#echo DX_FLAG_chi=$DX_FLAG_chi
	#echo DX_FLAG_rtf=$DX_FLAG_rtf
	#echo DX_FLAG_xml=$DX_FLAG_xml
	#echo DX_FLAG_pdf=$DX_FLAG_pdf
	#echo DX_FLAG_ps=$DX_FLAG_ps
	#echo DX_ENV=$DX_ENV
	])