case $option in
    *=*)
	envvar=`expr "x$option" : 'x\([^=]*\)='`
	# Reject names that are not valid shell variable names.
	expr "x$envvar" : ".*[^_$as_cr_alnum]" >/dev/null &&
	{ echo "$as_me: error: invalid variable name: $envvar" >&2
	    { (cleanup; exit 1); cleanup; exit 1; }; }
	optarg=`echo "$optarg" | sed "s/'/'\\\\\\\\''/g"`
	eval "$envvar='$optarg'"
	export $envvar 
    continue;;
    *)
	echo "Unrecognized option: $option"
	exit 1
    ;;
esac