autogen.sh

#!/bin/sh -x
#
# Run this script to regenerate autoconf files
#
recheck=false
if [ x"$1" = x--recheck ]; then
    recheck=true
    config=$(sh config.status --config 2>/dev/null)
fi

# 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" && \
		( test -f "$autolib"/"$prg" && \
		      sed -n -r -e \
			  's/^(scriptver(|sion)|timestamp)=['\''"]?([^'\''"]+).*$/\3/p' \
			  "$autolib"/"$prg" autoconf/helpers/"$prg" | \
			  sort --check=quiet; 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
fi
rm -rf autoconf/*m4.old
"$AUTOHEADER" -B autoconf
if [ config/config.h.in -nt config/unconfig.h ]; then
    # Create a file corresponding to a completely empty configure
    # instance, commenting out the #undef directives from the template
    # just like configure would do.
    perl -np < config/config.h.in > config/unconfig.h \
	 -e 's:^(\#\s*undef\s.*)$:/* $1 */:;' \
	 -e 's:config/config.h.in:config/unconfig.h:;' \
	 -e 's:autoheader:autogen.sh:;'
fi
"$AUTOCONF" -B autoconf
rm -rf autom4te.cache config.log config.status config/config.h Makefile

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