fixing #5056

7 files changed, 1014 insertions, 2 deletions

diff --git a/.gitignore b/.gitignore
index f79006e6..06e6ce06 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,3 +42,5 @@ src/lib/test_merchant_api_home/.local/share/taler/exchange/wirefees/
 src/merchant-tools/taler-merchant-generate-payments
 src/merchant-tools/mitm/taler-merchant-mitm
 src/merchant-tools/mitm/merchant-mitm.wsgi
+doxygen-doc/
+contrib/taler-merchant.tag
diff --git a/Doxyfile b/Doxyfile
new file mode 100644
index 00000000..3c068dbe
--- /dev/null
+++ b/Doxyfile
@@ -0,0 +1,247 @@
+# Doxyfile 1.5.5
+
+#---------------------------------------------------------------------------
+# Project related configuration options
+#---------------------------------------------------------------------------
+DOXYFILE_ENCODING      = UTF-8
+PROJECT_NAME           = "GNU Taler: Merchant"
+PROJECT_NUMBER         = 0.3
+OUTPUT_DIRECTORY       = doxygen-doc/
+CREATE_SUBDIRS         = YES
+OUTPUT_LANGUAGE        = English
+BRIEF_MEMBER_DESC      = YES
+REPEAT_BRIEF           = YES
+ABBREVIATE_BRIEF       = "The $name class" \
+                         "The $name widget" \
+                         "The $name file" \
+                         is \
+                         provides \
+                         specifies \
+                         contains \
+                         represents \
+                         a \
+                         an \
+                         the
+ALWAYS_DETAILED_SEC    = NO
+INLINE_INHERITED_MEMB  = NO
+FULL_PATH_NAMES        = YES
+STRIP_FROM_PATH        = .
+STRIP_FROM_INC_PATH    = src/include
+SHORT_NAMES            = NO
+JAVADOC_AUTOBRIEF      = NO
+QT_AUTOBRIEF           = NO
+MULTILINE_CPP_IS_BRIEF = NO
+INHERIT_DOCS           = NO
+SEPARATE_MEMBER_PAGES  = NO
+TAB_SIZE               = 8
+ALIASES                =
+OPTIMIZE_OUTPUT_FOR_C  = YES
+OPTIMIZE_OUTPUT_JAVA   = NO
+OPTIMIZE_FOR_FORTRAN   = NO
+OPTIMIZE_OUTPUT_VHDL   = NO
+BUILTIN_STL_SUPPORT    = NO
+CPP_CLI_SUPPORT        = NO
+SIP_SUPPORT            = NO
+DISTRIBUTE_GROUP_DOC   = NO
+SUBGROUPING            = YES
+TYPEDEF_HIDES_STRUCT   = NO
+#---------------------------------------------------------------------------
+# Build related configuration options
+#---------------------------------------------------------------------------
+EXTRACT_ALL            = YES
+EXTRACT_PRIVATE        = NO
+EXTRACT_STATIC         = YES
+EXTRACT_LOCAL_CLASSES  = NO
+EXTRACT_LOCAL_METHODS  = YES
+EXTRACT_ANON_NSPACES   = NO
+HIDE_UNDOC_MEMBERS     = NO
+HIDE_UNDOC_CLASSES     = NO
+HIDE_FRIEND_COMPOUNDS  = NO
+HIDE_IN_BODY_DOCS      = NO
+INTERNAL_DOCS          = NO
+CASE_SENSE_NAMES       = YES
+HIDE_SCOPE_NAMES       = NO
+SHOW_INCLUDE_FILES     = YES
+INLINE_INFO            = YES
+SORT_MEMBER_DOCS       = YES
+SORT_BRIEF_DOCS        = NO
+SORT_GROUP_NAMES       = NO
+SORT_BY_SCOPE_NAME     = NO
+GENERATE_TODOLIST      = NO
+GENERATE_TESTLIST      = NO
+GENERATE_BUGLIST       = NO
+GENERATE_DEPRECATEDLIST= NO
+ENABLED_SECTIONS       =
+MAX_INITIALIZER_LINES  = 30
+SHOW_USED_FILES        = YES
+FILE_VERSION_FILTER    =
+#---------------------------------------------------------------------------
+# configuration options related to warning and progress messages
+#---------------------------------------------------------------------------
+QUIET                  = YES
+WARNINGS               = YES
+WARN_IF_UNDOCUMENTED   = YES
+WARN_IF_DOC_ERROR      = YES
+WARN_NO_PARAMDOC       = YES
+WARN_FORMAT            = "$file:$line: $text"
+WARN_LOGFILE           =
+#---------------------------------------------------------------------------
+# configuration options related to the input files
+#---------------------------------------------------------------------------
+INPUT                  = src/
+INPUT_ENCODING         = UTF-8
+FILE_PATTERNS          = *.c \
+                         *.h
+RECURSIVE              = YES
+EXCLUDE                =
+EXCLUDE_SYMLINKS       = NO
+EXCLUDE_PATTERNS       = */test_* */.git/* */perf_* */tls_test_*  taler_config.h
+EXCLUDE_SYMBOLS        = GNUNET_* JSON_*
+EXAMPLE_PATH           =
+EXAMPLE_PATTERNS       = *
+EXAMPLE_RECURSIVE      = NO
+IMAGE_PATH             =
+INPUT_FILTER           =
+FILTER_PATTERNS        =
+FILTER_SOURCE_FILES    = NO
+#---------------------------------------------------------------------------
+# configuration options related to source browsing
+#---------------------------------------------------------------------------
+SOURCE_BROWSER         = YES
+INLINE_SOURCES         = NO
+STRIP_CODE_COMMENTS    = YES
+REFERENCED_BY_RELATION = YES
+REFERENCES_RELATION    = YES
+REFERENCES_LINK_SOURCE = YES
+USE_HTAGS              = NO
+VERBATIM_HEADERS       = NO
+#---------------------------------------------------------------------------
+# configuration options related to the alphabetical class index
+#---------------------------------------------------------------------------
+ALPHABETICAL_INDEX     = YES
+COLS_IN_ALPHA_INDEX    = 5
+IGNORE_PREFIX          = TALER_
+#---------------------------------------------------------------------------
+# configuration options related to the HTML output
+#---------------------------------------------------------------------------
+#GENERATE_HTML          = YES
+HTML_OUTPUT            = html
+HTML_FILE_EXTENSION    = .html
+HTML_HEADER            =
+HTML_FOOTER            =
+HTML_STYLESHEET        =
+GENERATE_HTMLHELP      = NO
+GENERATE_DOCSET        = NO
+DOCSET_FEEDNAME        = "Doxygen generated docs"
+DOCSET_BUNDLE_ID       = org.doxygen.Project
+HTML_DYNAMIC_SECTIONS  = NO
+CHM_FILE               =
+HHC_LOCATION           =
+GENERATE_CHI           = NO
+BINARY_TOC             = NO
+TOC_EXPAND             = NO
+DISABLE_INDEX          = NO
+ENUM_VALUES_PER_LINE   = 4
+GENERATE_TREEVIEW      = YES
+TREEVIEW_WIDTH         = 250
+#---------------------------------------------------------------------------
+# configuration options related to the LaTeX output
+#---------------------------------------------------------------------------
+#GENERATE_LATEX         = YES
+LATEX_OUTPUT           = latex
+LATEX_CMD_NAME         = latex
+MAKEINDEX_CMD_NAME     = makeindex
+COMPACT_LATEX          = YES
+PAPER_TYPE             = a4wide
+EXTRA_PACKAGES         =
+LATEX_HEADER           =
+PDF_HYPERLINKS         = YES
+USE_PDFLATEX           = YES
+LATEX_BATCHMODE        = NO
+LATEX_HIDE_INDICES     = NO
+#---------------------------------------------------------------------------
+# configuration options related to the RTF output
+#---------------------------------------------------------------------------
+#GENERATE_RTF           = NO
+RTF_OUTPUT             = rtf
+COMPACT_RTF            = YES
+RTF_HYPERLINKS         = NO
+RTF_STYLESHEET_FILE    =
+RTF_EXTENSIONS_FILE    =
+#---------------------------------------------------------------------------
+# configuration options related to the man page output
+#---------------------------------------------------------------------------
+GENERATE_MAN           = NO
+MAN_OUTPUT             = man
+MAN_EXTENSION          = .3
+MAN_LINKS              = NO
+#---------------------------------------------------------------------------
+# configuration options related to the XML output
+#---------------------------------------------------------------------------
+#GENERATE_XML           = NO
+XML_OUTPUT             = xml
+XML_PROGRAMLISTING     = YES
+#---------------------------------------------------------------------------
+# configuration options for the AutoGen Definitions output
+#---------------------------------------------------------------------------
+GENERATE_AUTOGEN_DEF   = NO
+#---------------------------------------------------------------------------
+# configuration options related to the Perl module output
+#---------------------------------------------------------------------------
+GENERATE_PERLMOD       = NO
+PERLMOD_LATEX          = NO
+PERLMOD_PRETTY         = YES
+PERLMOD_MAKEVAR_PREFIX =
+#---------------------------------------------------------------------------
+# Configuration options related to the preprocessor
+#---------------------------------------------------------------------------
+ENABLE_PREPROCESSING   = YES
+MACRO_EXPANSION        = NO
+EXPAND_ONLY_PREDEF     = NO
+SEARCH_INCLUDES        = YES
+INCLUDE_PATH           =
+INCLUDE_FILE_PATTERNS  =
+PREDEFINED             =
+EXPAND_AS_DEFINED      =
+SKIP_FUNCTION_MACROS   = YES
+#---------------------------------------------------------------------------
+# Configuration::additions related to external references
+#---------------------------------------------------------------------------
+TAGFILES               = contrib/gnunet.tag \
+                         contrib/microhttpd.tag \
+                         contrib/taler-exchange.tag
+GENERATE_TAGFILE       = contrib/taler-merchant.tag
+ALLEXTERNALS           = NO
+EXTERNAL_GROUPS        = YES
+PERL_PATH              = /usr/bin/perl
+#---------------------------------------------------------------------------
+# Configuration options related to the dot tool
+#---------------------------------------------------------------------------
+CLASS_DIAGRAMS         = NO
+MSCGEN_PATH            =
+HIDE_UNDOC_RELATIONS   = YES
+HAVE_DOT               = YES
+CLASS_GRAPH            = NO
+COLLABORATION_GRAPH    = NO
+GROUP_GRAPHS           = NO
+UML_LOOK               = NO
+TEMPLATE_RELATIONS     = NO
+INCLUDE_GRAPH          = YES
+INCLUDED_BY_GRAPH      = YES
+CALL_GRAPH             = YES
+CALLER_GRAPH           = YES
+GRAPHICAL_HIERARCHY    = NO
+DIRECTORY_GRAPH        = YES
+DOT_IMAGE_FORMAT       = png
+DOT_PATH               =
+DOTFILE_DIRS           =
+DOT_GRAPH_MAX_NODES    = 100
+MAX_DOT_GRAPH_DEPTH    = 2
+DOT_TRANSPARENT        = YES
+DOT_MULTI_TARGETS      = NO
+GENERATE_LEGEND        = YES
+DOT_CLEANUP            = YES
+#---------------------------------------------------------------------------
+# Configuration::additions related to the search engine
+#---------------------------------------------------------------------------
+SEARCHENGINE           = YES
diff --git a/Makefile.am b/Makefile.am
index 5f796c57..fdab91e4 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,12 +1,25 @@
 # This Makefile is in the public domain
 
-SUBDIRS = src
+if DOC_ONLY
+  SUBDIRS = . doc
+else
+  SUBDIRS = . src
 if WITH_DOC
   SUBDIRS += doc
 endif
+endif
+
+@DX_RULES@
 
 ACLOCAL_AMFLAGS = -I m4
-EXTRA_DIST = AUTHORS COPYING.GPL COPYING.AGPL COPYING.LGPL
+EXTRA_DIST = \
+ AUTHORS \
+ COPYING.GPL \
+ COPYING.AGPL \
+ COPYING.LGPL \
+ contrib/gnunet.tag \
+ contrib/microhttpd.tag \
+ Doxyfile
 
 app:
 	mkdir -p $(PACKAGE)-frontend-$(VERSION)-app
diff --git a/configure.ac b/configure.ac
index 91288ce2..33127239 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,6 +17,25 @@ AC_CONFIG_MACRO_DIR([m4])
 
 LT_INIT
 
+DX_INIT_DOXYGEN([taler-merchant],,,
+DX_PS_FEATURE(OFF),
+DX_PDF_FEATURE(OFF),
+DX_RTF_FEATURE(OFF),
+DX_CHI_FEATURE(OFF),
+DX_XML_FEATURE(OFF))
+
+AC_MSG_CHECKING([whether to compile documentation ONLY])
+AC_ARG_ENABLE([only-doc],
+  [AS_HELP_STRING([--enable-only-doc], [only compile Taler documentation])],
+  [doc_only=${enableval}],
+  [doc_only=no])
+AC_MSG_RESULT($doc_only)
+AM_CONDITIONAL([DOC_ONLY], [test "$doc_only" = "yes"])
+
+if test "$doc_only" != yes
+then
+
+
 # Checks for programs.
 AC_PROG_CC
 AC_PROG_CC_C99
@@ -273,6 +292,22 @@ AC_CHECK_PROG([tsc],[tsc],[yes],[no])
 AM_CONDITIONAL([HAVE_TSC], [test "x$tsc" = xyes])
 
 
+else
+
+# logic if doc_only is set, make sure conditionals are still defined
+AM_CONDITIONAL([HAVE_GNUNETPQ], [false])
+AM_CONDITIONAL([HAVE_POSTGRESQL], [false])
+AM_CONDITIONAL([HAVE_TALERFAKEBANK], [false])
+AM_CONDITIONAL([HAVE_LIBCURL], [false])
+AM_CONDITIONAL([HAVE_LIBGNURL], [false])
+AM_CONDITIONAL([HAVE_TSC], [false])
+AM_CONDITIONAL([USE_COVERAGE], [false])
+
+
+# end of 'doc_only'
+fi
+
+
 AC_CONFIG_FILES([Makefile
 doc/Makefile
 src/Makefile
diff --git a/contrib/gnunet.tag b/contrib/gnunet.tag
new file mode 100644
index 00000000..1cf4f0de
--- /dev/null
+++ b/contrib/gnunet.tag
@@ -0,0 +1,55 @@
+<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
+<tagfile>
+  <compound kind="file">
+    <name>gnunet_util_lib.h</name>
+    <path></path>
+    <filename>gnunet_util_lib.h</filename>
+    <member kind="define">
+      <type>#define</type>
+      <name>GNUNET_YES</name>
+      <anchorfile>gnunet_util_lib.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>GNUNET_OK</name>
+      <anchorfile>gnunet_util_lib.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>GNUNET_NO</name>
+      <anchorfile>gnunet_util_lib.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>GNUNET_SYSERR</name>
+      <anchorfile>gnunet_util_lib.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>GNUNET_TIME_UNIT_FOREVER_ABS</name>
+      <anchorfile>gnunet_util_lib.h</anchorfile>
+      <arglist></arglist>
+    </member>
+  </compound>
+  <compound kind="file">
+    <name>gnunet_pq_lib.h</name>
+    <path></path>
+    <filename>gnunet_pq_lib.h</filename>
+    <member kind="define">
+      <type>#define</type>
+      <name>GNUNET_PQ_query_param_end</name>
+      <anchorfile>gnunet_pq_lib.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="typedef">
+      <type>int</type>
+      <name>GNUNET_PQ_ResultConverter</name>
+      <anchorfile>gnunet_pq_lib.h</anchorfile>
+      <arglist>)(void *cls, PGresult *result, int row, const char *fname, size_t *dst_size, void *dst)</arglist>
+    </member>
+  </compound>
+</tagfile>
diff --git a/contrib/microhttpd.tag b/contrib/microhttpd.tag
new file mode 100644
index 00000000..8fab93d9
--- /dev/null
+++ b/contrib/microhttpd.tag
@@ -0,0 +1,74 @@
+<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
+<tagfile>
+  <compound kind="file">
+    <name>microhttpd_lib.h</name>
+    <path></path>
+    <filename>microhttpd.h</filename>
+    <member kind="define">
+      <type>#define</type>
+      <name>MHD_YES</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>MHD_NO</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>MHD_HTTP_OK</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>MHD_HTTP_NO_CONTENT</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>MHD_HTTP_METHOD_GET</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>MHD_HTTP_METHOD_PUT</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>MHD_HTTP_METHOD_DELETE</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>MHD_HTTP_METHOD_POST</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>MHD_HTTP_VERSION_1_1</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="define">
+      <type>#define</type>
+      <name>MHD_OPTION_NOTIFY_COMPLETED</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist></arglist>
+    </member>
+    <member kind="typedef">
+      <type>int</type>
+      <name>MHD_AccessHandlerCallback</name>
+      <anchorfile>microhttpd.h</anchorfile>
+      <arglist>)(void *cls, struct MHD_Connection *connection, const char *url, const char *method, const char *version, const char *upload_data, size_t *upload_data_size, void **con_cls)</arglist>
+    </member>
+  </compound>
+</tagfile>
diff --git a/m4/ax_prog_doxygen.m4 b/m4/ax_prog_doxygen.m4
new file mode 100644
index 00000000..a371f7fd
--- /dev/null
+++ b/m4/ax_prog_doxygen.m4
@@ -0,0 +1,586 @@
+# ===========================================================================
+#     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
+])