eval { bootstrap MIME::Base64 $VERSION; };
if ($@) {
    # can't bootstrap XS implementation, use perl implementation
    *encode_base64 = \&old_encode_base64;
    *decode_base64 = \&old_decode_base64;

    $OLD_CODE = $@;
    #warn $@ if $^W;
}

# Historically this module has been implemented as pure perl code.
# The XS implementation runs about 20 times faster, but the Perl
# code might be more portable, so it is still here.