[racket] Build error on i586

> I note that the `--enable-cgcdefault' is not usually a `configure' flag
> that you want, since it makes conservative collection the default,
> instead of precise collection. I don't think that's causes the problem
> with +nan.0s, but it's worth trying without.
>
> Also, the `--enable-backtrace' flag is unlikely to be worthwhile.
> That's for a memory-debugging mode, and it adds significant overhead.

OK, that's all right now. Thanks!

-- 
REAL aka Евгений Ростовцев, программист ЦНИТ КемГУ
ALT Linux team