use File::Copy qw();

if (-f "Util.xs") {
    print STDERR "Disabling XS in sources...\n";

    die "***** Failed, sources could be inconsistent! *****\n"
     unless File::Copy::move('MANIFEST',	'MANIFEST.X')
	and File::Copy::move('MANIFEST.N',	'MANIFEST')
	and File::Copy::move('Util.pm',		'Util.pmX')
	and File::Copy::move('Util.xs',		'Util.xsX')
	and File::Copy::move('Util.pmN',	'Util.pm');
}