nginx: [emerg] unknown directive "set" in /usr/local/nginx/conf/nginx.conf:43

Ich comiled nginx aktivieren-push-Modul(http://pushmodule.slact.net/) implementiert nginx comet server.

Wenn ich versuche zu starten bekomme ich:
nginx: [emerg] unknown directive "set" in /usr/local/nginx/conf/nginx.conf:43

Hier meine conf:

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       8080;
        server_name  localhost;

    location /publish {
        # Название переменной с идентификатором канала
        # в нашем примере "cid", т.е. запрос будет таким:
        # http://example.com/publish?cid=s42378fwe
        set $push_channel_id $arg_cid;
        push_publisher;

        # Отключаем хранение очереди (сообщение удаляется после доставки)
        push_store_messages off;
    }

    location /listen {
        push_subscriber;

        # Обслуживать только первого "слушателя"
        # Остальным отправляем 403
        push_subscriber_concurrency first;

        # Идентификатор канала
        set $push_channel_id $arg_cid;

        # Тип ответа
        default_type text/plain;
    }


        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location /{
            root   html;
            index  index.html index.htm;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location /{
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443;
    #    server_name  localhost;

    #    ssl                  on;
    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_timeout  5m;

    #    ssl_protocols  SSLv2 SSLv3 TLSv1;
    #    ssl_ciphers  ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
    #    ssl_prefer_server_ciphers   on;

    #    location /{
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

System: ubuntu 10.10 x86. Kann jemand mir bitte helfen?