Не работает aio в nginx 0.8.17 Gentoo Linux

[Андрей Василишин <a.vasilishin@xxxxxx>]

* Checking nginx' configuration ...
[emerg]: unknown directive "aio" in /etc/nginx/nginx.conf:97
configuration file /etc/nginx/nginx.conf test failed
* failed, please correct errors 
above                                                                                                                  
[ !! ]
 > nginx -V
nginx version: nginx/0.8.17
configure arguments: --prefix=/usr --conf-path=/etc/nginx/nginx.conf 
--http-log-path=/var/log/nginx/access_log 
--error-log-path=/var/log/nginx/error_log --pid-path=/var/run/nginx.pid 
--http-client-body-temp-path=/var/tmp/nginx/client 
--http-proxy-temp-path=/var/tmp/nginx/proxy 
--http-fastcgi-temp-path=/var/tmp/nginx/fastcgi --with-md5-asm 
--with-md5=/usr/include --with-sha1-asm --with-sha1=/usr/include 
--with-http_realip_module --with-debug --with-http_ssl_module 
--with-http_perl_module --with-http_stub_status_module 
--with-http_sub_module
--
WBR, Andrey Vasilishin CDIG1-UANIC, CDIG1-RIPE