#!/bin/sh
#                        a u t o g e n . s h
#
# Copyright (c) 2005-2010 United States Government as represented by
# the U.S. Army Research Laboratory.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# 3. The name of the author may not be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
###
#
# Script for automatically preparing the sources for compilation by
# performing the myriad of necessary steps.  The script attempts to
# detect proper version support, and outputs warnings about particular
# systems that have autotool peculiarities.
#
# Basically, if everything is set up and installed correctly, the
# script will validate that minimum versions of the GNU Build System
# tools are installed, account for several common configuration
# issues, and then simply run autoreconf for you.
#
# If autoreconf fails, which can happen for many valid configurations,
# this script proceeds to run manual preparation steps effectively
# providing a POSIX shell script (mostly complete) reimplementation of
# autoreconf.
#
# The AUTORECONF, AUTOCONF, AUTOMAKE, LIBTOOLIZE, ACLOCAL, AUTOHEADER
# environment variables and corresponding _OPTIONS variables (e.g.
# AUTORECONF_OPTIONS) may be used to override the default automatic
# detection behaviors.  Similarly the _VERSION variables will override
# the minimum required version numbers.
#
# Examples:
#
#   To obtain help on usage:
#     ./autogen.sh --help
#
#   To obtain verbose output:
#     ./autogen.sh --verbose
#
#   To skip autoreconf and prepare manually:
#     AUTORECONF=false ./autogen.sh
#
#   To verbosely try running with an older (unsupported) autoconf:
#     AUTOCONF_VERSION=2.50 ./autogen.sh --verbose
#
# Author:
#   Christopher Sean Morrison <morrison@brlcad.org>
#
# Patches:
#   Sebastian Pipping <sebastian@pipping.org>
#   Tom Browder <tbrowder2@users.sourceforge.net>
#
######################################################################

# set to minimum acceptable version of autoconf
if [ "x$AUTOCONF_VERSION" = "x" ] ; then
    AUTOCONF_VERSION=2.58
fi
# set to minimum acceptable version of automake
if [ "x$AUTOMAKE_VERSION" = "x" ] ; then
    AUTOMAKE_VERSION=1.6.0
fi
# set to minimum acceptable version of libtool
if [ "x$LIBTOOL_VERSION" = "x" ] ; then
    LIBTOOL_VERSION=1.4.2
fi


##################
# ident function #
##################
ident ( ) {
    # extract copyright from header
    __copyright="`grep Copyright $AUTOGEN_SH | head -${HEAD_N}1 | awk '{print $4}'`"
    if [ "x$__copyright" = "x" ] ; then
	__copyright="`date +%Y`"
    fi

    # extract version from CVS Id string
    __id="$Id: autogen.sh 38795 2010-04-26 19:34:05Z brlcad $"
    __version="`echo $__id | sed 's/.*\([0-9][0-9][0-9][0-9]\)[-\/]\([0-9][0-9]\)[-\/]\([0-9][0-9]\).*/\1\2\3/'`"
    if [ "x$__version" = "x" ] ; then
	__version=""
    fi

    echo "autogen.sh build preparation script by Christopher Sean Morrison"
    echo "  + config.guess download patch by Sebastian Pipping (2008-12-03)"
    echo "revised 3-clause BSD-style license, copyright (c) $__copyright"
    echo "script version $__version, ISO/IEC 9945 POSIX shell script"
}


##################
# USAGE FUNCTION #
##################
usage ( ) {
    echo "Usage: $AUTOGEN_SH [-h|--help] [-v|--verbose] [-q|--quiet] [-d|--download] [--version]"
    echo "    --help      Help on $NAME_OF_AUTOGEN usage"
    echo "    --verbose   Verbose progress output"
    echo "    --quiet     Quiet suppressed progress output"
    echo "    --download  Download the latest config.guess from gnulib"
    echo "    --version   Only perform GNU Build System version checks"
    echo
    echo "Description: This script will validate that minimum versions of the"
    echo "GNU Build System tools are installed and then run autoreconf for you."
    echo "Should autoreconf fail, manual preparation steps will be run"
    echo "potentially accounting for several common preparation issues.  The"

    echo "AUTORECONF, AUTOCONF, AUTOMAKE, LIBTOOLIZE, ACLOCAL, AUTOHEADER,"
    echo "PROJECT, & CONFIGURE environment variables and corresponding _OPTIONS"
    echo "variables (e.g. AUTORECONF_OPTIONS) may be used to override the"
    echo "default automatic detection behavior."
    echo

    ident

    return 0
}


##########################
# VERSION_ERROR FUNCTION #
##########################
version_error ( ) {
    if [ "x$1" = "x" ] ; then
	echo "INTERNAL ERROR: version_error was not provided a version"
	exit 1
    fi
    if [ "x$2" = "x" ] ; then
	echo "INTERNAL ERROR: version_error was not provided an application name"
	exit 1
    fi
    $ECHO
    $ECHO "ERROR:  To prepare the ${PROJECT} build system from scratch,"
    $ECHO "        at least version $1 of $2 must be installed."
    $ECHO
    $ECHO "$NAME_OF_AUTOGEN does not need to be run on the same machine that will"
    $ECHO "run configure or make.  Either the GNU Autotools will need to be installed"
    $ECHO "or upgraded on this system, or $NAME_OF_AUTOGEN must be run on the source"
    $ECHO "code on another system and then transferred to here. -- Cheers!"
    $ECHO
}

##########################
# VERSION_CHECK FUNCTION #
##########################
version_check ( ) {
    if [ "x$1" = "x" ] ; then
	echo "INTERNAL ERROR: version_check was not provided a minimum version"
	exit 1
    fi
    _min="$1"
    if [ "x$2" = "x" ] ; then
	echo "INTERNAL ERROR: version check was not provided a comparison version"
	exit 1
    fi
    _cur="$2"

    # needed to handle versions like 1.10 and 1.4-p6
    _min="`echo ${_min}. | sed 's/[^0-9]/./g' | sed 's/\.\././g'`"
    _cur="`echo ${_cur}. | sed 's/[^0-9]/./g' | sed 's/\.\././g'`"

    _min_major="`echo $_min | cut -d. -f1`"
    _min_minor="`echo $_min | cut -d. -f2`"
    _min_patch="`echo $_min | cut -d. -f3`"

    _cur_major="`echo $_cur | cut -d. -f1`"
    _cur_minor="`echo $_cur | cut -d. -f2`"
    _cur_patch="`echo $_cur | cut -d. -f3`"

    if [ "x$_min_major" = "x" ] ; then
	_min_major=0
    fi
    if [ "x$_min_minor" = "x" ] ; then
	_min_minor=0
    fi
    if [ "x$_min_patch" = "x" ] ; then
	_min_patch=0
    fi
    if [ "x$_cur_minor" = "x" ] ; then
	_cur_major=0
    fi
    if [ "x$_cur_minor" = "x" ] ; then
	_cur_minor=0
    fi
    if [ "x$_cur_patch" = "x" ] ; then
	_cur_patch=0
    fi

    $VERBOSE_ECHO "Checking if ${_cur_major}.${_cur_minor}.${_cur_patch} is greater than ${_min_major}.${_min_minor}.${_min_patch}"

    if [ $_min_major -lt $_cur_major ] ; then
	return 0
    elif [ $_min_major -eq $_cur_major ] ; then
	if [ $_min_minor -lt $_cur_minor ] ; then
	    return 0
	elif [ $_min_minor -eq $_cur_minor ] ; then
	    if [ $_min_patch -lt $_cur_patch ] ; then
		return 0
	    elif [ $_min_patch -eq $_cur_patch ] ; then
		return 0
	    fi
	fi
    fi
    return 1
}


######################################
# LOCATE_CONFIGURE_TEMPLATE FUNCTION #
######################################
locate_configure_template ( ) {
    _pwd="`pwd`"
    if test -f "./configure.ac" ; then
	echo "./configure.ac"
    elif test -f "./configure.in" ; then
	echo "./configure.in"
    elif test -f "$_pwd/configure.ac" ; then
	echo "$_pwd/configure.ac"
    elif test -f "$_pwd/configure.in" ; then
	echo "$_pwd/configure.in"
    elif test -f "$PATH_TO_AUTOGEN/configure.ac" ; then
	echo "$PATH_TO_AUTOGEN/configure.ac"
    elif test -f "$PATH_TO_AUTOGEN/configure.in" ; then
	echo "$PATH_TO_AUTOGEN/configure.in"
    fi
}


##################
# argument check #
##################
ARGS="$*"
PATH_TO_AUTOGEN="`dirname $0`"
NAME_OF_AUTOGEN="`basename $0`"
AUTOGEN_SH="$PATH_TO_AUTOGEN/$NAME_OF_AUTOGEN"

LIBTOOL_M4="${PATH_TO_AUTOGEN}/misc/libtool.m4"

if [ "x$HELP" = "x" ] ; then
    HELP=no
fi
if [ "x$QUIET" = "x" ] ; then
    QUIET=no
fi
if [ "x$VERBOSE" = "x" ] ; then
    VERBOSE=no
fi
if [ "x$VERSION_ONLY" = "x" ] ; then
    VERSION_ONLY=no
fi
if [ "x$DOWNLOAD" = "x" ] ; then
    DOWNLOAD=no
fi
if [ "x$AUTORECONF_OPTIONS" = "x" ] ; then
    AUTORECONF_OPTIONS="-i -f"
fi
if [ "x$AUTOCONF_OPTIONS" = "x" ] ; then
    AUTOCONF_OPTIONS="-f"
fi
if [ "x$AUTOMAKE_OPTIONS" = "x" ] ; then
    AUTOMAKE_OPTIONS="-a -c -f"
fi
ALT_AUTOMAKE_OPTIONS="-a -c"
if [ "x$LIBTOOLIZE_OPTIONS" = "x" ] ; then
    LIBTOOLIZE_OPTIONS="--automake -c -f"
fi
ALT_LIBTOOLIZE_OPTIONS="--automake --copy --force"
if [ "x$ACLOCAL_OPTIONS" = "x" ] ; then
    ACLOCAL_OPTIONS=""
fi
if [ "x$AUTOHEADER_OPTIONS" = "x" ] ; then
    AUTOHEADER_OPTIONS=""
fi
if [ "x$CONFIG_GUESS_URL" = "x" ] ; then
    CONFIG_GUESS_URL="http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob_plain;f=build-aux/config.guess;hb=HEAD"
fi
for arg in $ARGS ; do
    case "x$arg" in
	x--help) HELP=yes ;;
	x-[hH]) HELP=yes ;;
	x--quiet) QUIET=yes ;;
	x-[qQ]) QUIET=yes ;;
	x--verbose) VERBOSE=yes ;;
	x-[dD]) DOWNLOAD=yes ;;
	x--download) DOWNLOAD=yes ;;
	x-[vV]) VERBOSE=yes ;;
	x--version) VERSION_ONLY=yes ;;
	*)
	    echo "Unknown option: $arg"
	    echo
	    usage
	    exit 1
	    ;;
    esac
done


#####################
# environment check #
#####################

# sanity check before recursions potentially begin
if [ ! -f "$AUTOGEN_SH" ] ; then
    if test -f ./autogen.sh ; then
	PATH_TO_AUTOGEN="."
	NAME_OF_AUTOGEN="autogen.sh"
	AUTOGEN_SH="$PATH_TO_AUTOGEN/$NAME_OF_AUTOGEN"
    else
	echo "INTERNAL ERROR: $AUTOGEN_SH does not exist"
	exit 1
    fi
fi

# force locale setting to C so things like date output as expected
LC_ALL=C

# commands that this script expects
for __cmd in echo head tail pwd ; do
    echo "test" > /dev/null 2>&1 | $__cmd > /dev/null 2>&1
    if [ $? != 0 ] ; then
	echo "INTERNAL ERROR: '${__cmd}' command is required"
	exit 2
    fi
done
echo "test" | grep "test" > /dev/null 2>&1
if test ! x$? = x0 ; then
    echo "INTERNAL ERROR: grep command is required"
    exit 1
fi
echo "test" | sed "s/test/test/" > /dev/null 2>&1
if test ! x$? = x0 ; then
    echo "INTERNAL ERROR: sed command is required"
    exit 1
fi


# determine the behavior of echo
case `echo "testing\c"; echo 1,2,3`,`echo -n testing; echo 1,2,3` in
    *c*,-n*) ECHO_N= ECHO_C='
' ECHO_T='	' ;;
    *c*,*  ) ECHO_N=-n ECHO_C= ECHO_T= ;;
    *)       ECHO_N= ECHO_C='\c' ECHO_T= ;;
esac

# determine the behavior of head
case "x`echo 'head' | head -n 1 2>&1`" in
    *xhead*) HEAD_N="n " ;;
    *) HEAD_N="" ;;
esac

# determine the behavior of tail
case "x`echo 'tail' | tail -n 1 2>&1`" in
    *xtail*) TAIL_N="n " ;;
    *) TAIL_N="" ;;
esac

VERBOSE_ECHO=:
ECHO=:
if [ "x$QUIET" = "xyes" ] ; then
    if [ "x$VERBOSE" = "xyes" ] ; then
	echo "Verbose output quelled by quiet option.  Further output disabled."
    fi
else
    ECHO=echo
    if [ "x$VERBOSE" = "xyes" ] ; then
	echo "Verbose output enabled"
	VERBOSE_ECHO=echo
    fi
fi


# allow a recursive run to disable further recursions
if [ "x$RUN_RECURSIVE" = "x" ] ; then
    RUN_RECURSIVE=yes
fi


################################################
# check for help arg and bypass version checks #
################################################
if [ "x`echo $ARGS | sed 's/.*[hH][eE][lL][pP].*/help/'`" = "xhelp" ] ; then
    HELP=yes
fi
if [ "x$HELP" = "xyes" ] ; then
    usage
    $ECHO "---"
    $ECHO "Help was requested.  No preparation or configuration will be performed."
    exit 0
fi


#######################
# set up signal traps #
#######################
untrap_abnormal ( ) {
    for sig in 1 2 13 15; do
	trap - $sig
    done
}

# do this cleanup whenever we exit.
trap '
    # start from the root
    if test -d "$START_PATH" ; then
	cd "$START_PATH"
    fi

    # restore/delete backup files
    if test "x$PFC_INIT" = "x1" ; then
	recursive_restore
    fi
' 0

# trap SIGHUP (1), SIGINT (2), SIGPIPE (13), SIGTERM (15)
for sig in 1 2 13 15; do
    trap '
	$ECHO ""
	$ECHO "Aborting $NAME_OF_AUTOGEN: caught signal '$sig'"

	# start from the root
	if test -d "$START_PATH" ; then
	    cd "$START_PATH"
	fi

	# clean up on abnormal exit
	$VERBOSE_ECHO "rm -rf autom4te.cache"
	rm -rf autom4te.cache

	if test -f "acinclude.m4.$$.backup" ; then
	    $VERBOSE_ECHO "cat acinclude.m4.$$.backup > acinclude.m4"
	    chmod u+w acinclude.m4
	    cat acinclude.m4.$$.backup > acinclude.m4

	    $VERBOSE_ECHO "rm -f acinclude.m4.$$.backup"
	    rm -f acinclude.m4.$$.backup
        fi

	{ (exit 1); exit 1; }
' $sig
done


#############################
# look for a configure file #
#############################
if [ "x$CONFIGURE" = "x" ] ; then
    CONFIGURE="`locate_configure_template`"
    if [ ! "x$CONFIGURE" = "x" ] ; then
	$VERBOSE_ECHO "Found a configure template: $CONFIGURE"
    fi
else
    $ECHO "Using CONFIGURE environment variable override: $CONFIGURE"
fi
if [ "x$CONFIGURE" = "x" ] ; then
    if [ "x$VERSION_ONLY" = "xyes" ] ; then
	CONFIGURE=/dev/null
    else
	$ECHO
	$ECHO "A configure.ac or configure.in file could not be located implying"
	$ECHO "that the GNU Build System is at least not used in this directory.  In"
	$ECHO "any case, there is nothing to do here without one of those files."
	$ECHO
	$ECHO "ERROR: No configure.in or configure.ac file found in `pwd`"
	exit 1
    fi
fi

####################
# get project name #
####################
if [ "x$PROJECT" = "x" ] ; then
    PROJECT="`grep AC_INIT $CONFIGURE | grep -v '.*#.*AC_INIT' | tail -${TAIL_N}1 | sed 's/^[ 	]*AC_INIT(\([^,)]*\).*/\1/' | sed 's/.*\[\(.*\)\].*/\1/'`"
    if [ "x$PROJECT" = "xAC_INIT" ] ; then
	# projects might be using the older/deprecated arg-less AC_INIT .. look for AM_INIT_AUTOMAKE instead
	PROJECT="`grep AM_INIT_AUTOMAKE $CONFIGURE | grep -v '.*#.*AM_INIT_AUTOMAKE' | tail -${TAIL_N}1 | sed 's/^[ 	]*AM_INIT_AUTOMAKE(\([^,)]*\).*/\1/' | sed 's/.*\[\(.*\)\].*/\1/'`"
    fi
    if [ "x$PROJECT" = "xAM_INIT_AUTOMAKE" ] ; then
	PROJECT="project"
    fi
    if [ "x$PROJECT" = "x" ] ; then
	PROJECT="project"
    fi
else
    $ECHO "Using PROJECT environment variable override: $PROJECT"
fi
$ECHO "Preparing the $PROJECT build system...please wait"
$ECHO


########################
# check for autoreconf #
########################
HAVE_AUTORECONF=no
if [ "x$AUTORECONF" = "x" ] ; then
    for AUTORECONF in autoreconf ; do
	$VERBOSE_ECHO "Checking autoreconf version: $AUTORECONF --version"
	$AUTORECONF --version > /dev/null 2>&1
	if [ $? = 0 ] ; then
	    HAVE_AUTORECONF=yes
	    break
	fi
    done
else
    HAVE_AUTORECONF=yes
    $ECHO "Using AUTORECONF environment variable override: $AUTORECONF"
fi


##########################
# autoconf version check #
##########################
_acfound=no
if [ "x$AUTOCONF" = "x" ] ; then
    for AUTOCONF in autoconf ; do
	$VERBOSE_ECHO "Checking autoconf version: $AUTOCONF --version"
	$AUTOCONF --version > /dev/null 2>&1
	if [ $? = 0 ] ; then
	    _acfound=yes
	    break
	fi
    done
else
    _acfound=yes
    $ECHO "Using AUTOCONF environment variable override: $AUTOCONF"
fi

_report_error=no
if [ ! "x$_acfound" = "xyes" ] ; then
    $ECHO "ERROR:  Unable to locate GNU Autoconf."
    _report_error=yes
else
    _version="`$AUTOCONF --version | head -${HEAD_N}1 | sed 's/[^0-9]*\([0-9\.][0-9\.]*\)/\1/'`"
    if [ "x$_version" = "x" ] ; then
	_version="0.0.0"
    fi
    $ECHO "Found GNU Autoconf version $_version"
    version_check "$AUTOCONF_VERSION" "$_version"
    if [ $? -ne 0 ] ; then
	_report_error=yes
    fi
fi
if [ "x$_report_error" = "xyes" ] ; then
    version_error "$AUTOCONF_VERSION" "GNU Autoconf"
    exit 1
fi


##########################
# automake version check #
##########################
_amfound=no
if [ "x$AUTOMAKE" = "x" ] ; then
    for AUTOMAKE in automake ; do
	$VERBOSE_ECHO "Checking automake version: $AUTOMAKE --version"
	$AUTOMAKE --version > /dev/null 2>&1
	if [ $? = 0 ] ; then
	    _amfound=yes
	    break
	fi
    done
else
    _amfound=yes
    $ECHO "Using AUTOMAKE environment variable override: $AUTOMAKE"
fi


_report_error=no
if [ ! "x$_amfound" = "xyes" ] ; then
    $ECHO
    $ECHO "ERROR: Unable to locate GNU Automake."
    _report_error=yes
else
    _version="`$AUTOMAKE --version | head -${HEAD_N}1 | sed 's/[^0-9]*\([0-9\.][0-9\.]*\)/\1/'`"
    if [ "x$_version" = "x" ] ; then
	_version="0.0.0"
    fi
    $ECHO "Found GNU Automake version $_version"
    version_check "$AUTOMAKE_VERSION" "$_version"
    if [ $? -ne 0 ] ; then
	_report_error=yes
    fi
fi
if [ "x$_report_error" = "xyes" ] ; then
    version_error "$AUTOMAKE_VERSION" "GNU Automake"
    exit 1
fi


########################
# check for libtoolize #
########################
HAVE_LIBTOOLIZE=yes
HAVE_ALT_LIBTOOLIZE=no
_ltfound=no
if [ "x$LIBTOOLIZE" = "x" ] ; then
    LIBTOOLIZE=libtoolize
    $VERBOSE_ECHO "Checking libtoolize version: $LIBTOOLIZE --version"
    $LIBTOOLIZE --version > /dev/null 2>&1
    if [ ! $? = 0 ] ; then
	HAVE_LIBTOOLIZE=no
	$ECHO
	if [ "x$HAVE_AUTORECONF" = "xno" ] ; then
	    $ECHO "Warning:  libtoolize does not appear to be available."
	else
	    $ECHO "Warning:  libtoolize does not appear to be available.  This means that"
	    $ECHO "the automatic build preparation via autoreconf will probably not work."
	    $ECHO "Preparing the build by running each step individually, however, should"
	    $ECHO "work and will be done automatically for you if autoreconf fails."
	fi

	# look for some alternates
	for tool in glibtoolize libtoolize15 libtoolize14 libtoolize13 ; do
	    $VERBOSE_ECHO "Checking libtoolize alternate: $tool --version"
	    _glibtoolize="`$tool --version > /dev/null 2>&1`"
	    if [ $? = 0 ] ; then
		$VERBOSE_ECHO "Found $tool --version"
		_glti="`which $tool`"
		if [ "x$_glti" = "x" ] ; then
		    $VERBOSE_ECHO "Cannot find $tool with which"
		    continue;
		fi
		if test ! -f "$_glti" ; then
		    $VERBOSE_ECHO "Cannot use $tool, $_glti is not a file"
		    continue;
		fi
		_gltidir="`dirname $_glti`"
		if [ "x$_gltidir" = "x" ] ; then
		    $VERBOSE_ECHO "Cannot find $tool path with dirname of $_glti"
		    continue;
		fi
		if test ! -d "$_gltidir" ; then
		    $VERBOSE_ECHO "Cannot use $tool, $_gltidir is not a directory"
		    continue;
		fi
		HAVE_ALT_LIBTOOLIZE=yes
		LIBTOOLIZE="$tool"
		$ECHO
		$ECHO "Fortunately, $tool was found which means that your system may simply"
		$ECHO "have a non-standard or incomplete GNU Autotools install.  If you have"
		$ECHO "sufficient system access, it may be possible to quell this warning by"
		$ECHO "running:"
		$ECHO
		sudo -V > /dev/null 2>&1
		if [ $? = 0 ] ; then
		    $ECHO "   sudo ln -s $_glti $_gltidir/libtoolize"
		    $ECHO
		else
		    $ECHO "   ln -s $_glti $_gltidir/libtoolize"
		    $ECHO
		    $ECHO "Run that as root or with proper permissions to the $_gltidir directory"
		    $ECHO
		fi
		_ltfound=yes
		break
	    fi
	done
    else
	_ltfound=yes
    fi
else
    _ltfound=yes
    $ECHO "Using LIBTOOLIZE environment variable override: $LIBTOOLIZE"
fi


############################
# libtoolize version check #
############################
_report_error=no
if [ ! "x$_ltfound" = "xyes" ] ; then
    $ECHO
    $ECHO "ERROR: Unable to locate GNU Libtool."
    _report_error=yes
else
    _version="`$LIBTOOLIZE --version | head -${HEAD_N}1 | sed 's/[^0-9]*\([0-9\.][0-9\.]*\)/\1/'`"
    if [ "x$_version" = "x" ] ; then
	_version="0.0.0"
    fi
    $ECHO "Found GNU Libtool version $_version"
    version_check "$LIBTOOL_VERSION" "$_version"
    if [ $? -ne 0 ] ; then
	_report_error=yes
    fi
fi
if [ "x$_report_error" = "xyes" ] ; then
    version_error "$LIBTOOL_VERSION" "GNU Libtool"
    exit 1
fi


#####################
# check for aclocal #
#####################
if [ "x$ACLOCAL" = "x" ] ; then
    for ACLOCAL in aclocal ; do
	$VERBOSE_ECHO "Checking aclocal version: $ACLOCAL --version"
	$ACLOCAL --version > /dev/null 2>&1
	if [ $? = 0 ] ; then
	    break
	fi
    done
else
    $ECHO "Using ACLOCAL environment variable override: $ACLOCAL"
fi


########################
# check for autoheader #
########################
if [ "x$AUTOHEADER" = "x" ] ; then
    for AUTOHEADER in autoheader ; do
	$VERBOSE_ECHO "Checking autoheader version: $AUTOHEADER --version"
	$AUTOHEADER --version > /dev/null 2>&1
	if [ $? = 0 ] ; then
	    break
	fi
    done
else
    $ECHO "Using AUTOHEADER environment variable override: $AUTOHEADER"
fi


#########################
# check if version only #
#########################
$VERBOSE_ECHO "Checking whether to only output version information"
if [ "x$VERSION_ONLY" = "xyes" ] ; then
    $ECHO
    ident
    $ECHO "---"
    $ECHO "Version requested.  No preparation or configuration will be performed."
    exit 0
fi


#################################
# PROTECT_FROM_CLOBBER FUNCTION #
#################################
protect_from_clobber ( ) {
    PFC_INIT=1

    # protect COPYING & INSTALL from overwrite by automake.  the
    # automake force option will (inappropriately) ignore the existing
    # contents of a COPYING and/or INSTALL files (depending on the
    # version) instead of just forcing *missing* files like it does
    # for AUTHORS, NEWS, and README. this is broken but extremely
    # prevalent behavior, so we protect against it by keeping a backup
    # of the file that can later be restored.

    for file in COPYING INSTALL ; do
	if test -f ${file} ; then
	    if test -f ${file}.$$.protect_from_automake.backup ; then
		$VERBOSE_ECHO "Already backed up ${file} in `pwd`"
	    else
		$VERBOSE_ECHO "Backing up ${file} in `pwd`"
		$VERBOSE_ECHO "cp -p ${file} ${file}.$$.protect_from_automake.backup"
		cp -p ${file} ${file}.$$.protect_from_automake.backup
	    fi
	fi
    done
}


##############################
# RECURSIVE_PROTECT FUNCTION #
##############################
recursive_protect ( ) {

    # for projects using recursive configure, run the build
    # preparation steps for the subdirectories.  this function assumes
    # START_PATH was set to pwd before recursion begins so that
    # relative paths work.

    # git 'r done, protect COPYING and INSTALL from being clobbered
    protect_from_clobber

    if test -d autom4te.cache ; then
	$VERBOSE_ECHO "Found an autom4te.cache directory, deleting it"
	$VERBOSE_ECHO "rm -rf autom4te.cache"
	rm -rf autom4te.cache
    fi

    # find configure template
    _configure="`locate_configure_template`"
    if [ "x$_configure" = "x" ] ; then
	return
    fi
    # $VERBOSE_ECHO "Looking for configure template found `pwd`/$_configure"

    # look for subdirs
    # $VERBOSE_ECHO "Looking for subdirs in `pwd`"
    _det_config_subdirs="`grep AC_CONFIG_SUBDIRS $_configure | grep -v '.*#.*AC_CONFIG_SUBDIRS' | sed 's/^[ 	]*AC_CONFIG_SUBDIRS(\(.*\)).*/\1/' | sed 's/.*\[\(.*\)\].*/\1/'`"
    CHECK_DIRS=""
    for dir in $_det_config_subdirs ; do
	if test -d "`pwd`/$dir" ; then
	    CHECK_DIRS="$CHECK_DIRS \"`pwd`/$dir\""
	fi
    done

    # process subdirs
    if [ ! "x$CHECK_DIRS" = "x" ] ; then
	$VERBOSE_ECHO "Recursively scanning the following directories:"
	$VERBOSE_ECHO "  $CHECK_DIRS"
	for dir in $CHECK_DIRS ; do
	    $VERBOSE_ECHO "Protecting files from automake in $dir"
	    cd "$START_PATH"
	    eval "cd $dir"

	    # recursively git 'r done
	    recursive_protect
	done
    fi
} # end of recursive_protect


#############################
# RESTORE_CLOBBERED FUNCION #
#############################
restore_clobbered ( ) {

    # The automake (and autoreconf by extension) -f/--force-missing
    # option may overwrite COPYING and INSTALL even if they do exist.
    # Here we restore the files if necessary.

    spacer=no

    for file in COPYING INSTALL ; do
	if test -f ${file}.$$.protect_from_automake.backup ; then
	    if test -f ${file} ; then
	    # compare entire content, restore if needed
	    if test "x`cat ${file}`" != "x`cat ${file}.$$.protect_from_automake.backup`" ; then
		if test "x$spacer" = "xno" ; then
		    $VERBOSE_ECHO
		    spacer=yes
		fi
		# restore the backup
		$VERBOSE_ECHO "Restoring ${file} from backup (automake -f likely clobbered it)"
		$VERBOSE_ECHO "rm -f ${file}"
		rm -f ${file}
		$VERBOSE_ECHO "mv ${file}.$$.protect_from_automake.backup ${file}"
		mv ${file}.$$.protect_from_automake.backup ${file}
	    fi # check contents
	    elif test -f ${file}.$$.protect_from_automake.backup ; then
		$VERBOSE_ECHO "mv ${file}.$$.protect_from_automake.backup ${file}"
		mv ${file}.$$.protect_from_automake.backup ${file}
	    fi # -f ${file}
	
	    # just in case
	    $VERBOSE_ECHO "rm -f ${file}.$$.protect_from_automake.backup"
	    rm -f ${file}.$$.protect_from_automake.backup
	fi # -f ${file}.$$.protect_from_automake.backup
    done

    CONFIGURE="`locate_configure_template`"
    if [ "x$CONFIGURE" = "x" ] ; then
	return
    fi

    _aux_dir="`grep AC_CONFIG_AUX_DIR $CONFIGURE | grep -v '.*#.*AC_CONFIG_AUX_DIR' | tail -${TAIL_N}1 | sed 's/^[ 	]*AC_CONFIG_AUX_DIR(\(.*\)).*/\1/' | sed 's/.*\[\(.*\)\].*/\1/'`"
    if test ! -d "$_aux_dir" ; then
	_aux_dir=.
    fi

    for file in config.guess config.sub ltmain.sh ; do
	if test -f "${_aux_dir}/${file}" ; then
	    $VERBOSE_ECHO "rm -f \"${_aux_dir}/${file}.backup\""
	    rm -f "${_aux_dir}/${file}.backup"
	fi
    done
} # end of restore_clobbered


##############################
# RECURSIVE_RESTORE FUNCTION #
##############################
recursive_restore ( ) {

    # restore COPYING and INSTALL from backup if they were clobbered
    # for each directory recursively.

    # git 'r undone
    restore_clobbered

    # find configure template
    _configure="`locate_configure_template`"
    if [ "x$_configure" = "x" ] ; then
	return
    fi

    # look for subdirs
    _det_config_subdirs="`grep AC_CONFIG_SUBDIRS $_configure | grep -v '.*#.*AC_CONFIG_SUBDIRS' | sed 's/^[ 	]*AC_CONFIG_SUBDIRS(\(.*\)).*/\1/' | sed 's/.*\[\(.*\)\].*/\1/'`"
    CHECK_DIRS=""
    for dir in $_det_config_subdirs ; do
	if test -d "`pwd`/$dir" ; then
	    CHECK_DIRS="$CHECK_DIRS \"`pwd`/$dir\""
	fi
    done

    # process subdirs
    if [ ! "x$CHECK_DIRS" = "x" ] ; then
	$VERBOSE_ECHO "Recursively scanning the following directories:"
	$VERBOSE_ECHO "  $CHECK_DIRS"
	for dir in $CHECK_DIRS ; do
	    $VERBOSE_ECHO "Checking files for automake damage in $dir"
	    cd "$START_PATH"
	    eval "cd $dir"

	    # recursively git 'r undone
	    recursive_restore
	done
    fi
} # end of recursive_restore


#######################
# INITIALIZE FUNCTION #
#######################
initialize ( ) {

    # this routine performs a variety of directory-specific
    # initializations.  some are sanity checks, some are preventive,
    # and some are necessary setup detection.
    #
    # this function sets:
    #   CONFIGURE
    #   SEARCH_DIRS
    #   CONFIG_SUBDIRS

    ##################################
    # check for a configure template #
    ##################################
    CONFIGURE="`locate_configure_template`"
    if [ "x$CONFIGURE" = "x" ] ; then
	$ECHO
	$ECHO "A configure.ac or configure.in file could not be located implying"
	$ECHO "that the GNU Build System is at least not used in this directory.  In"
	$ECHO "any case, there is nothing to do here without one of those files."
	$ECHO
	$ECHO "ERROR: No configure.in or configure.ac file found in `pwd`"
	exit 1
    fi

    #####################
    # detect an aux dir #
    #####################
    _aux_dir="`grep AC_CONFIG_AUX_DIR $CONFIGURE | grep -v '.*#.*AC_CONFIG_AUX_DIR' | tail -${TAIL_N}1 | sed 's/^[ 	]*AC_CONFIG_AUX_DIR(\(.*\)).*/\1/' | sed 's/.*\[\(.*\)\].*/\1/'`"
    if test ! -d "$_aux_dir" ; then
	_aux_dir=.
    else
	$VERBOSE_ECHO "Detected auxillary directory: $_aux_dir"
    fi

    ################################
    # detect a recursive configure #
    ################################
    CONFIG_SUBDIRS=""
    _det_config_subdirs="`grep AC_CONFIG_SUBDIRS $CONFIGURE | grep -v '.*#.*AC_CONFIG_SUBDIRS' | sed 's/^[ 	]*AC_CONFIG_SUBDIRS(\(.*\)).*/\1/' | sed 's/.*\[\(.*\)\].*/\1/'`"
    for dir in $_det_config_subdirs ; do
	if test -d "`pwd`/$dir" ; then
	    $VERBOSE_ECHO "Detected recursive configure directory: `pwd`/$dir"
	    CONFIG_SUBDIRS="$CONFIG_SUBDIRS `pwd`/$dir"
	fi
    done

    ###########################################################
    # make sure certain required files exist for GNU projects #
    ###########################################################
    _marker_found=""
    _marker_found_message_intro='Detected non-GNU marker "'
    _marker_found_message_mid='" in '
    for marker in foreign cygnus ; do
	_marker_found_message=${_marker_found_message_intro}${marker}${_marker_found_message_mid}
	_marker_found="`grep 'AM_INIT_AUTOMAKE.*'${marker} $CONFIGURE`"
	if [ ! "x$_marker_found" = "x" ] ; then
	    $VERBOSE_ECHO "${_marker_found_message}`basename \"$CONFIGURE\"`"
	    break
	fi
	if test -f "`dirname \"$CONFIGURE\"/Makefile.am`" ; then
	    _marker_found="`grep 'AUTOMAKE_OPTIONS.*'${marker} Makefile.am`"
	    if [ ! "x$_marker_found" = "x" ] ; then
		$VERBOSE_ECHO "${_marker_found_message}Makefile.am"
		break
	    fi
	fi
    done
    if [ "x${_marker_found}" = "x" ] ; then
	_suggest_foreign=no
	for file in AUTHORS COPYING ChangeLog INSTALL NEWS README ; do
	    if [ ! -f $file ] ; then
		$VERBOSE_ECHO "Touching ${file} since it does not exist"
		_suggest_foreign=yes
		touch $file
	    fi
	done

	if [ "x${_suggest_foreign}" = "xyes" ] ; then
	    $ECHO
	    $ECHO "Warning: Several files expected of projects that conform to the GNU"
	    $ECHO "coding standards were not found.  The files were automatically added"
	    $ECHO "for you since you do not have a 'foreign' declaration specified."
	    $ECHO
	    $ECHO "Considered adding 'foreign' to AM_INIT_AUTOMAKE in `basename \"$CONFIGURE\"`"
	    if test -f "`dirname \"$CONFIGURE\"/Makefile.am`" ; then
		$ECHO "or to AUTOMAKE_OPTIONS in your top-level Makefile.am file."
	    fi
	    $ECHO
	fi
    fi

    ##################################################
    # make sure certain generated files do not exist #
    ##################################################
    for file in config.guess config.sub ltmain.sh ; do
	if test -f "${_aux_dir}/${file}" ; then
	    $VERBOSE_ECHO "mv -f \"${_aux_dir}/${file}\" \"${_aux_dir}/${file}.backup\""
	    mv -f "${_aux_dir}/${file}" "${_aux_dir}/${file}.backup"
	fi
    done

    ############################
    # search alternate m4 dirs #
    ############################
    SEARCH_DIRS=""
    for dir in m4 ; do
	if [ -d $dir ] ; then
	    $VERBOSE_ECHO "Found extra aclocal search directory: $dir"
	    SEARCH_DIRS="$SEARCH_DIRS -I `pwd`/$dir"
	fi
    done

    ######################################
    # remove any previous build products #
    ######################################
    if test -d autom4te.cache ; then
	$VERBOSE_ECHO "Found an autom4te.cache directory, deleting it"
	$VERBOSE_ECHO "rm -rf autom4te.cache"
	rm -rf autom4te.cache
    fi
# tcl/tk (and probably others) have a customized aclocal.m4, so can't delete it
#     if test -f aclocal.m4 ; then
# 	$VERBOSE_ECHO "Found an aclocal.m4 file, deleting it"
# 	$VERBOSE_ECHO "rm -f aclocal.m4"
# 	rm -f aclocal.m4
#     fi

} # end of initialize()


##############
# initialize #
##############

# stash path
START_PATH="`pwd`"

# Before running autoreconf or manual steps, some prep detection work
# is necessary or useful.  Only needs to occur once per directory, but
# does need to traverse the entire subconfigure hierarchy to protect
# files from being clobbered even by autoreconf.
recursive_protect

# start from where we started
cd "$START_PATH"

# get ready to process
initialize


#########################################
# DOWNLOAD_GNULIB_CONFIG_GUESS FUNCTION #
#########################################

# TODO - should make sure wget/curl exist and/or work before trying to
# use them.

download_gnulib_config_guess () {
    # abuse gitweb to download gnulib's latest config.guess via HTTP
    config_guess_temp="config.guess.$$.download"
    ret=1
    for __cmd in wget curl fetch ; do
	$VERBOSE_ECHO "Checking for command ${__cmd}"
	${__cmd} --version > /dev/null 2>&1
	ret=$?
	if [ ! $ret = 0 ] ; then
	    continue
        fi

	__cmd_version=`${__cmd} --version | head -n 1 | sed -e 's/^[^0-9]\+//' -e 's/ .*//'`
	$VERBOSE_ECHO "Found ${__cmd} ${__cmd_version}"

	opts=""
	case ${__cmd} in
	    wget)
		opts="-O" 
		;;
	    curl)
		opts="-o"
		;;
	    fetch)
		opts="-t 5 -f"
		;;
	esac

	$VERBOSE_ECHO "Running $__cmd \"${CONFIG_GUESS_URL}\" $opts \"${config_guess_temp}\""
	eval "$__cmd \"${CONFIG_GUESS_URL}\" $opts \"${config_guess_temp}\"" > /dev/null 2>&1
	if [ $? = 0 ] ; then
	    mv -f "${config_guess_temp}" ${_aux_dir}/config.guess
	    ret=0
	    break
	fi
    done

    if [ ! $ret = 0 ] ; then
	$ECHO "Warning: config.guess download failed from: $CONFIG_GUESS_URL"
	rm -f "${config_guess_temp}"
    fi
}


##############################
# LIBTOOLIZE_NEEDED FUNCTION #
##############################
libtoolize_needed () {
    ret=1 # means no, don't need libtoolize
    for feature in AC_PROG_LIBTOOL AM_PROG_LIBTOOL LT_INIT ; do
	$VERBOSE_ECHO "Searching for $feature in $CONFIGURE"
	found="`grep \"^$feature.*\" $CONFIGURE`"
	if [ ! "x$found" = "x" ] ; then
	    ret=0 # means yes, need to run libtoolize
	    break
	fi
    done
    return ${ret}
}



############################################
# prepare build via autoreconf or manually #
############################################
reconfigure_manually=no
if [ "x$HAVE_AUTORECONF" = "xyes" ] ; then
    $ECHO
    $ECHO $ECHO_N "Automatically preparing build ... $ECHO_C"

    $VERBOSE_ECHO "$AUTORECONF $SEARCH_DIRS $AUTORECONF_OPTIONS"
    autoreconf_output="`$AUTORECONF $SEARCH_DIRS $AUTORECONF_OPTIONS 2>&1`"
    ret=$?
    $VERBOSE_ECHO "$autoreconf_output"

    if [ ! $ret = 0 ] ; then
	if [ "x$HAVE_ALT_LIBTOOLIZE" = "xyes" ] ; then
	    if [ ! "x`echo \"$autoreconf_output\" | grep libtoolize | grep \"No such file or directory\"`" = "x" ] ; then
		$ECHO
		$ECHO "Warning: autoreconf failed but due to what is usually a common libtool"
		$ECHO "misconfiguration issue.  This problem is encountered on systems that"
		$ECHO "have installed libtoolize under a different name without providing a"
		$ECHO "symbolic link or without setting the LIBTOOLIZE environment variable."
		$ECHO
		$ECHO "Restarting the preparation steps with LIBTOOLIZE set to $LIBTOOLIZE"

		export LIBTOOLIZE
		RUN_RECURSIVE=no
		export RUN_RECURSIVE
		untrap_abnormal

		$VERBOSE_ECHO sh $AUTOGEN_SH "$1" "$2" "$3" "$4" "$5" "$6" "$7" "$8" "$9"
		sh "$AUTOGEN_SH" "$1" "$2" "$3" "$4" "$5" "$6" "$7" "$8" "$9"
		exit $?
	    fi
	fi

	$ECHO "Warning: $AUTORECONF failed"

	if test -f ltmain.sh ; then
	    $ECHO "libtoolize being run by autoreconf is not creating ltmain.sh in the auxillary directory like it should"
	fi

	$ECHO "Attempting to run the preparation steps individually"
	reconfigure_manually=yes
    else
	if [ "x$DOWNLOAD" = "xyes" ] ; then
	    if libtoolize_needed ; then
		download_gnulib_config_guess
	    fi
	fi
    fi
else
    reconfigure_manually=yes
fi


############################
# LIBTOOL_FAILURE FUNCTION #
############################
libtool_failure ( ) {

    # libtool is rather error-prone in comparison to the other
    # autotools and this routine attempts to compensate for some
    # common failures.  the output after a libtoolize failure is
    # parsed for an error related to AC_PROG_LIBTOOL and if found, we
    # attempt to inject a project-provided libtool.m4 file.

    _autoconf_output="$1"

    if [ "x$RUN_RECURSIVE" = "xno" ] ; then
	# we already tried the libtool.m4, don't try again
	return 1
    fi

    if test -f "$LIBTOOL_M4" ; then
	found_libtool="`$ECHO $_autoconf_output | grep AC_PROG_LIBTOOL`"
	if test ! "x$found_libtool" = "x" ; then
	    if test -f acinclude.m4 ; then
		rm -f acinclude.m4.$$.backup
		$VERBOSE_ECHO "cat acinclude.m4 > acinclude.m4.$$.backup"
		cat acinclude.m4 > acinclude.m4.$$.backup
	    fi
	    $VERBOSE_ECHO "cat \"$LIBTOOL_M4\" >> acinclude.m4"
	    chmod u+w acinclude.m4
	    cat "$LIBTOOL_M4" >> acinclude.m4

	    # don't keep doing this
	    RUN_RECURSIVE=no
	    export RUN_RECURSIVE
	    untrap_abnormal

	    $ECHO
	    $ECHO "Restarting the preparation steps with libtool macros in acinclude.m4"
	    $VERBOSE_ECHO sh $AUTOGEN_SH "$1" "$2" "$3" "$4" "$5" "$6" "$7" "$8" "$9"
	    sh "$AUTOGEN_SH" "$1" "$2" "$3" "$4" "$5" "$6" "$7" "$8" "$9"
	    exit $?
	fi
    fi
}


###########################
# MANUAL_AUTOGEN FUNCTION #
###########################
manual_autogen ( ) {

    ##################################################
    # Manual preparation steps taken are as follows: #
    #   aclocal [-I m4]                              #
    #   libtoolize --automake -c -f                  #
    #   aclocal [-I m4]                              #
    #   autoconf -f                                  #
    #   autoheader                                   #
    #   automake -a -c -f                            #
    ##################################################

    ###########
    # aclocal #
    ###########
    $VERBOSE_ECHO "$ACLOCAL $SEARCH_DIRS $ACLOCAL_OPTIONS"
    aclocal_output="`$ACLOCAL $SEARCH_DIRS $ACLOCAL_OPTIONS 2>&1`"
    ret=$?
    $VERBOSE_ECHO "$aclocal_output"
    if [ ! $ret = 0 ] ; then $ECHO "ERROR: $ACLOCAL failed" && exit 2 ; fi

    ##############
    # libtoolize #
    ##############
    if libtoolize_needed ; then
	if [ "x$HAVE_LIBTOOLIZE" = "xyes" ] ; then
	    $VERBOSE_ECHO "$LIBTOOLIZE $LIBTOOLIZE_OPTIONS"
	    libtoolize_output="`$LIBTOOLIZE $LIBTOOLIZE_OPTIONS 2>&1`"
	    ret=$?
	    $VERBOSE_ECHO "$libtoolize_output"

	    if [ ! $ret = 0 ] ; then $ECHO "ERROR: $LIBTOOLIZE failed" && exit 2 ; fi
	else
	    if [ "x$HAVE_ALT_LIBTOOLIZE" = "xyes" ] ; then
		$VERBOSE_ECHO "$LIBTOOLIZE $ALT_LIBTOOLIZE_OPTIONS"
		libtoolize_output="`$LIBTOOLIZE $ALT_LIBTOOLIZE_OPTIONS 2>&1`"
		ret=$?
		$VERBOSE_ECHO "$libtoolize_output"

		if [ ! $ret = 0 ] ; then $ECHO "ERROR: $LIBTOOLIZE failed" && exit 2 ; fi
	    fi
	fi

	###########
	# aclocal #
	###########
	# re-run again as instructed by libtoolize
	$VERBOSE_ECHO "$ACLOCAL $SEARCH_DIRS $ACLOCAL_OPTIONS"
	aclocal_output="`$ACLOCAL $SEARCH_DIRS $ACLOCAL_OPTIONS 2>&1`"
	ret=$?
	$VERBOSE_ECHO "$aclocal_output"

	# libtoolize might put ltmain.sh in the wrong place
	if test -f ltmain.sh ; then
	    if test ! -f "${_aux_dir}/ltmain.sh" ; then
		$ECHO
		$ECHO "Warning:  $LIBTOOLIZE is creating ltmain.sh in the wrong directory"
		$ECHO
		$ECHO "Fortunately, the problem can be worked around by simply copying the"
		$ECHO "file to the appropriate location (${_aux_dir}/).  This has been done for you."
		$ECHO
		$VERBOSE_ECHO "cp -p ltmain.sh \"${_aux_dir}/ltmain.sh\""
		cp -p ltmain.sh "${_aux_dir}/ltmain.sh"
		$ECHO $ECHO_N "Continuing build preparation ... $ECHO_C"
	    fi
	fi # ltmain.sh

	if [ "x$DOWNLOAD" = "xyes" ] ; then
	    download_gnulib_config_guess
	fi
    fi # libtoolize_needed

    ############
    # autoconf #
    ############
    $VERBOSE_ECHO
    $VERBOSE_ECHO "$AUTOCONF $AUTOCONF_OPTIONS"
    autoconf_output="`$AUTOCONF $AUTOCONF_OPTIONS 2>&1`"
    ret=$?
    $VERBOSE_ECHO "$autoconf_output"

    if [ ! $ret = 0 ] ; then
	# retry without the -f and check for usage of macros that are too new
	ac2_65_macros="AT_CHECK_EUNIT AC_PROG_OBJCXX AC_PROG_OBJCXXCPP"
	ac2_64_macros="AT_CHECK_UNQUOTED AT_FAIL_IF AT_SKIP_IF AC_ERLANG_SUBST_ERTS_VER"
	ac2_62_macros="AC_AUTOCONF_VERSION AC_OPENMP AC_PATH_PROGS_FEATURE_CHECK"
	ac2_60_macros="AC_C_FLEXIBLE_ARRAY_MEMBER AC_C_VARARRAYS"
	ac2_59_macros="AC_C_RESTRICT AC_INCLUDES_DEFAULT AC_LANG_ASSERT AC_LANG_WERROR AS_SET_CATFILE AC_PROG_SED AC_PROG_GREP AC_REQUIRE_AUX_FILE AC_CHECK_TARGET_TOOL AC_PATH_TARGET_TOOL AC_CHECK_TARGET_TOOLS AC_CHECK_ALIGNOF AC_PROG_OBJC AC_PROG_OBJCPP AC_ERLANG_SUBST_INSTALL_LIB_DIR AC_ERLANG_SUBST_INSTALL_LIB_SUBDIR AC_ERLANG_PATH_ERLC AC_ERLANG_NEED_ERLC AC_ERLANG_PATH_ERL AC_ERLANG_NEED_ERL AC_ERLANG_CHECK_LIB AC_ERLANG_SUBST_ROOT_DIR AC_ERLANG_SUBST_LIB_DIR AT_COPYRIGHT AS_BOURNE_COMPATIBLE AS_SHELL_SANITIZE AS_CASE AH_HEADER AC_USE_SYSTEM_EXTENSIONS AC_TYPE_INT8_T AC_TYPE_INT16_T AC_TYPE_INT32_T AC_TYPE_INT64_T AC_TYPE_INTMAX_T AC_TYPE_INTPTR_T AC_TYPE_LONG_LONG_INT AC_TYPE_SSIZE_T AC_TYPE_UINT8_T AC_TYPE_UINT16_T AC_TYPE_UINT32_T AC_TYPE_UINT64_T AC_TYPE_UINTMAX_T AC_TYPE_UINTPTR_T AC_TYPE_UNSIGNED_LONG_LONG_INT AC_TYPE_LONG_DOUBLE AC_TYPE_LONG_DOUBLE_WIDER AC_STRUCT_DIRENT_D_INO AC_STRUCT_DIRENT_D_TYPE AC_PROG_CC_C89 AC_PROG_CC_C99 AC_PRESERVE_HELP_ORDER AC_HEADER_ASSERT AC_FUNC_STRTOLD AC_C_TYPEOF AC_PROG_MKDIR_P AC_PROG_CXX_C_O"
	ac2_55_macros="AC_COMPILER_IFELSE AC_FUNC_MBRTOWC AC_HEADER_STDBOOL AC_LANG_CONFTEST AC_LANG_SOURCE AC_LANG_PROGRAM AC_LANG_CALL AC_LANG_FUNC_TRY_LINK AC_MSG_FAILURE AC_PREPROC_IFELSE"
	ac2_54_macros="AC_C_BACKSLASH_A AC_CONFIG_LIBOBJ_DIR AC_GNU_SOURCE AC_PROG_EGREP AC_PROG_FGREP AC_REPLACE_FNMATCH AC_FUNC_FNMATCH_GNU AC_FUNC_REALLOC AC_TYPE_MBSTATE_T"

	macros_to_search=""
	ac_major="`echo ${AUTOCONF_VERSION}. | cut -d. -f1 | sed 's/[^0-9]//g'`"
	ac_minor="`echo ${AUTOCONF_VERSION}. | cut -d. -f2 | sed 's/[^0-9]//g'`"

	if [ $ac_major -lt 2 ] ; then
	    macros_to_search="$ac2_65 $ac2_64 $ac2_62 $ac2_60 $ac2_59 $ac2_55 $ac2_54"
	else
	    if [ $ac_minor -lt 54 ] ; then
		macros_to_search="$ac2_65 $ac2_64 $ac2_62 $ac2_60 $ac2_59 $ac2_55 $ac2_54"
	    elif [ $ac_minor -lt 55 ] ; then
		macros_to_search="$ac2_65 $ac2_64 $ac2_62 $ac2_60 $ac2_59 $ac2_55"
	    elif [ $ac_minor -lt 59 ] ; then
		macros_to_search="$ac2_65 $ac2_64 $ac2_62 $ac2_60 $ac2_59"
	    elif [ $ac_minor -lt 60 ] ; then
		macros_to_search="$ac2_65 $ac2_64 $ac2_62 $ac2_60"
	    elif [ $ac_minor -lt 62 ] ; then
		macros_to_search="$ac2_65 $ac2_64 $ac2_62"
	    elif [ $ac_minor -lt 64 ] ; then
		macros_to_search="$ac2_65 $ac2_64"
	    elif [ $ac_minor -lt 65 ] ; then
		macros_to_search="$ac2_65"
	    fi
	fi

	configure_ac_macros=__none__
	for feature in $macros_to_search ; do
	    $VERBOSE_ECHO "Searching for $feature in $CONFIGURE"
	    found="`grep \"^$feature.*\" $CONFIGURE`"
	    if [ ! "x$found" = "x" ] ; then
		if [ "x$configure_ac_macros" = "x__none__" ] ; then
		    configure_ac_macros="$feature"
		else
		    configure_ac_macros="$feature $configure_ac_macros"
		fi
	    fi
	done
	if [ ! "x$configure_ac_macros" = "x__none__" ] ; then
	    $ECHO
	    $ECHO "Warning:  Unsupported macros were found in $CONFIGURE"
	    $ECHO
	    $ECHO "The `basename \"$CONFIGURE\"` file was scanned in order to determine if any"
	    $ECHO "unsupported macros are used that exceed the minimum version"
	    $ECHO "settings specified within this file.  As such, the following macros"
	    $ECHO "should be removed from configure.ac or the version numbers in this"
	    $ECHO "file should be increased:"
	    $ECHO
	    $ECHO "$configure_ac_macros"
	    $ECHO
	    $ECHO $ECHO_N "Ignorantly continuing build preparation ... $ECHO_C"
	fi

	###################
	# autoconf, retry #
	###################
	$VERBOSE_ECHO
	$VERBOSE_ECHO "$AUTOCONF"
	autoconf_output="`$AUTOCONF 2>&1`"
	ret=$?
	$VERBOSE_ECHO "$autoconf_output"

	if [ ! $ret = 0 ] ; then
	    # test if libtool is busted
	    libtool_failure "$autoconf_output"

	    # let the user know what went wrong
	    cat <<EOF
$autoconf_output
EOF
	    $ECHO "ERROR: $AUTOCONF failed"
	    exit 2
	else
	    # autoconf sans -f and possibly sans unsupported options succeed so warn verbosely
	    $ECHO
	    $ECHO "Warning: autoconf seems to have succeeded by removing the following options:"
	    $ECHO "	AUTOCONF_OPTIONS=\"$AUTOCONF_OPTIONS\""
	    $ECHO
	    $ECHO "Removing those options should not be necessary and indicate some other"
	    $ECHO "problem with the build system.  The build preparation is highly suspect"
	    $ECHO "and may result in configuration or compilation errors.  Consider"
	    if [ "x$VERBOSE_ECHO" = "x:" ] ; then
		$ECHO "rerunning the build preparation with verbose output enabled."
		$ECHO "	$AUTOGEN_SH --verbose"
	    else
		$ECHO "reviewing the minimum GNU Autotools version settings contained in"
		$ECHO "this script along with the macros being used in your `basename \"$CONFIGURE\"` file."
	    fi
	    $ECHO
	    $ECHO $ECHO_N "Continuing build preparation ... $ECHO_C"
	fi # autoconf ret = 0
    fi # autoconf ret = 0

    ##############
    # autoheader #
    ##############
    need_autoheader=no
    for feature in AM_CONFIG_HEADER AC_CONFIG_HEADER ; do
	$VERBOSE_ECHO "Searching for $feature in $CONFIGURE"
	found="`grep \"^$feature.*\" $CONFIGURE`"
	if [ ! "x$found" = "x" ] ; then
	    need_autoheader=yes
	    break
	fi
    done
    if [ "x$need_autoheader" = "xyes" ] ; then
	$VERBOSE_ECHO "$AUTOHEADER $AUTOHEADER_OPTIONS"
	autoheader_output="`$AUTOHEADER $AUTOHEADER_OPTIONS 2>&1`"
	ret=$?
	$VERBOSE_ECHO "$autoheader_output"
	if [ ! $ret = 0 ] ; then $ECHO "ERROR: $AUTOHEADER failed" && exit 2 ; fi
    fi # need_autoheader

    ############
    # automake #
    ############
    need_automake=no
    for feature in AM_INIT_AUTOMAKE ; do
	$VERBOSE_ECHO "Searching for $feature in $CONFIGURE"
	found="`grep \"^$feature.*\" $CONFIGURE`"
	if [ ! "x$found" = "x" ] ; then
	    need_automake=yes
	    break
	fi
    done

    if [ "x$need_automake" = "xyes" ] ; then
	$VERBOSE_ECHO "$AUTOMAKE $AUTOMAKE_OPTIONS"
	automake_output="`$AUTOMAKE $AUTOMAKE_OPTIONS 2>&1`"
	ret=$?
	$VERBOSE_ECHO "$automake_output"

	if [ ! $ret = 0 ] ; then

	    ###################
	    # automake, retry #
	    ###################
	    $VERBOSE_ECHO
	    $VERBOSE_ECHO "$AUTOMAKE $ALT_AUTOMAKE_OPTIONS"
	    # retry without the -f
	    automake_output="`$AUTOMAKE $ALT_AUTOMAKE_OPTIONS 2>&1`"
	    ret=$?
	    $VERBOSE_ECHO "$automake_output"

	    if [ ! $ret = 0 ] ; then
	 	# test if libtool is busted
		libtool_failure "$automake_output"

		# let the user know what went wrong
		cat <<EOF
$automake_output
EOF
		$ECHO "ERROR: $AUTOMAKE failed"
		exit 2
	    fi # automake retry
	fi # automake ret = 0
    fi # need_automake
} # end of manual_autogen


#####################################
# RECURSIVE_MANUAL_AUTOGEN FUNCTION #
#####################################
recursive_manual_autogen ( ) {

    # run the build preparation steps manually for this directory
    manual_autogen

    # for projects using recursive configure, run the build
    # preparation steps for the subdirectories.
    if [ ! "x$CONFIG_SUBDIRS" = "x" ] ; then
	$VERBOSE_ECHO "Recursively configuring the following directories:"
	$VERBOSE_ECHO "  $CONFIG_SUBDIRS"
	for dir in $CONFIG_SUBDIRS ; do
	    $VERBOSE_ECHO "Processing recursive configure in $dir"
	    cd "$START_PATH"
	    cd "$dir"

	    # new directory, prepare
	    initialize

	    # run manual steps for the subdir and any others below
	    recursive_manual_autogen
	done
    fi
}


################################
# run manual preparation steps #
################################
if [ "x$reconfigure_manually" = "xyes" ] ; then
    $ECHO
    $ECHO $ECHO_N "Preparing build ... $ECHO_C"

    recursive_manual_autogen
fi


#########################
# restore and summarize #
#########################
cd "$START_PATH"

# restore COPYING and INSTALL from backup if necessary
recursive_restore

# make sure we end up with a configure script
config_ac="`locate_configure_template`"
config="`echo $config_ac | sed 's/\.ac$//' | sed 's/\.in$//'`"
if [ "x$config" = "x" ] ; then
    $VERBOSE_ECHO "Could not locate the configure template (from `pwd`)"
fi

# summarize
$ECHO "done"
$ECHO
if test "x$config" = "x" -o ! -f "$config" ; then
    $ECHO "WARNING: The $PROJECT build system should now be prepared but there"
    $ECHO "does not seem to be a resulting configure file.  This is unexpected"
    $ECHO "and likely the result of an error.  You should run $NAME_OF_AUTOGEN"
    $ECHO "with the --verbose option to get more details on a potential"
    $ECHO "misconfiguration."
else
    $ECHO "The $PROJECT build system is now prepared.  To build here, run:"
    $ECHO "  $config"
    $ECHO "  make"
fi

# finish up where we started
cd "$START_PATH"

# Local Variables:
# mode: sh
# tab-width: 8
# sh-basic-offset: 4
# sh-indentation: 4
# indent-tabs-mode: t
# End:
# ex: shiftwidth=4 tabstop=8
