my $prefix = $flags =~ /n/ ? '' : 'pTHX_';
my $args = scalar @args;
$ret .= "\n#ifdef CHECK_FORMAT\n";
- $ret .= sprintf " __attribute__((format(__printf__,%s%d,%s%d)))",
+ $ret .=
+ sprintf " __attribute__((__format__(__printf__,%s%d,%s%d)))",
$prefix, $args - 1, $prefix, $args;
$ret .= "\n#endif\n";
}