mod_proxy
cd /usr/local/src/httpd-2.2.4/modules/proxy /usr/local/apache2/bin/apxs -c *.c /usr/local/apache2/bin/apxs -i -a -n mod_proxy mod_proxy.la
でもエラーが...
httpd: Syntax error on line 105 of /usr/local/apache2/conf/httpd.conf: Cannot load /usr/local/apache2/modules/mod_proxy.so into server: /usr/local/apache2/modules/mod_proxy.so: undefined symbol: proxy_lb_workers