use File::Copy qw();

if (-f "Normalize.xsX") {
    print STDERR "Enabling XS in sources...\n";

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