Conf of ngx_cache_purge

Server NGINX
1

here is my conf:
fastcgi_cache_path /usr/local/nginx/fastcgi_cache
levels=1:2 keys_zone=DIGG:10m inactive=2m;

            location /
                    {
                            fastcgi_cache DIGG;
                            fastcgi_cache_key

$host$uri$is_args$args;
fastcgi_cache_valid 200 302 1h;
fastcgi_cache_valid 301 1d;
fastcgi_cache_valid any 1m;
fastcgi_cache_min_uses 2;
fastcgi_cache_use_stale error timeout
invalid_header http_500;
fastcgi_pass unix:/tmp/php-cgi.sock;
#fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fcgi.conf;
}
location ~ /purge(/.*)
{
allow 127.0.0.1;
deny all;
fastcgi_cache_purge DIGG
$host$1$is_args$args;
}
nginx -t don’t returns any error.
but when i visit http://mydomain/purge/xxx.jpg, it returns me a 404
page.
i checked the error log and found this:

2010/10/11 05:04:25 [emerg] 8915#0: unknown directive
“fastcgi_cache_purge” in /usr/local/nginx/conf/nginx.conf:27

is there anybody help me? thanks a lot.

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