autogen.sh

#!/bin/sh -x
#
# Run this script to regenerate autoconf files
#
recheck=false
for arg; do
    case x"$arg" in
	x--recheck)
	    recheck=true
	    config=$(sh config.status --config 2>/dev/null)
	    ;;
	x--clearenv)
	    unset AUTOCONF AUTOMAKE ACLOCAL AUTOHEADER ACLOCAL_PATH
	    ;;
	*)
	    echo "$0: unknown option: $arg" 1>&2
	    ;;
    esac
done

# This allows for overriding the default autoconf programs
AUTOCONF="${AUTOCONF:-${AUTOTOOLS_PREFIX}autoconf}"
AUTOMAKE="${AUTOMAKE:-${AUTOTOOLS_PREFIX}automake}"
ACLOCAL="${ACLOCAL:-${AUTOTOOLS_PREFIX}aclocal}"
AUTOHEADER="${AUTOHEADER:-${AUTOTOOLS_PREFIX}autoheader}"

mkdir -p autoconf autoconf/helpers config
autolib="`"$AUTOMAKE" --print-libdir`"
if test ! x"$autolib" = x; then
    for prg in install-sh compile config.guess config.sub; do
	# Update autoconf helpers if and only if newer ones are available
	if test -f "$autolib"/"$prg" && \
		( set -e ; \
		  test -f autoconf/helpers/"$prg" && sed -n \
		    -e 's/^scriptver=/scriptversion=/' \
		    -e 's/^timestamp=/scriptversion=/' \
		    -e 's/^scriptversion=['\''"]?\([^'\''"]*\).*$/\1/p' \
			  "$autolib"/"$prg" autoconf/helpers/"$prg" | \
			  sort -c 2>/dev/null ; \
		  test $? -ne 0 )
	then
	    cp -f "$autolib"/"$prg" autoconf/helpers
	fi
    done
fi
mv -f autoconf/aclocal.m4 autoconf/aclocal.m4.old
mkdir -p autoconf/m4.old autoconf/m4
mv -f autoconf/m4/*.m4 autoconf/m4.old/ 2>/dev/null || true
ACLOCAL_PATH="${ACLOCAL_PATH}${ACLOCAL_PATH:+:}`pwd`/autoconf/m4.old"
export ACLOCAL_PATH
"$ACLOCAL" --install --output=autoconf/aclocal.m4 -I autoconf/m4
if test ! -f autoconf/aclocal.m4; then
    # aclocal failed, revert to previous files
    mv -f autoconf/m4.old/*.m4 autoconf/m4/
    mv -f autoconf/aclocal.m4.old autoconf/aclocal.m4
    exit 1
fi
rm -rf autoconf/*m4.old
"$AUTOHEADER" -B autoconf
"$AUTOCONF" -B autoconf
(
    echo '#!/bin/sh'
    "$AUTOCONF" -B autoconf \
		-t AC_CONFIG_HEADERS:'rm -f $*' \
		-t AC_CONFIG_FILES:'rm -f $*'
    echo 'rm -f config.log config.status'
    echo 'rm -rf autom4te.cache'
) > autoconf/clean.sh
chmod +x autoconf/clean.sh
sh autoconf/clean.sh

rm -f configure~ || true

# Try to regenerate unconfig.h if Perl is available and unconfig.pl
# is present in the autoconf directory.
if [ -n "$(which perl)" -a -f autoconf/unconfig.pl ]; then
    perl autoconf/unconfig.pl . config/config.h.in config/unconfig.h
fi

if $recheck; then
    # This bizarre statement has to do with how config.status quotes its output
    echo exec sh configure $config | sh -
fi