http {
	...
	server {
		...

		location / {
			try_files $uri $uri/ @memcached;
		}

		location @memcached {
			default_type text/html;

			set $memcached_key DATAPREFIX$host$request_uri;
			memcached_pass MEMCACHEDHOST:MEMCACHEDPORT;
			error_page 404 = @rewrites;
		}

		location @rewrites {
			rewrite ^(.*)$ /index.php?q=$1 last;
		}
		
		...
	}
}
...