Nginx: unknown directive "uwsgi_param" in /etc/nginx/uwsgi_params:1

Using this deployment tutorial, I'm trying to get an Ubuntu 12.04 server up and running with Flask, uWSGI and Nginx. I now have trouble getting Nginx to run. When I try to (re)start nginx it simply says ...fail!, and when I run a test (using sudo nginx -t), it says:

nginx: [emerg] unknown directive "uwsgi_param" in /etc/nginx/uwsgi_params:1
nginx: configuration file /etc/nginx/nginx.conf test failed

I didn't change anything in that file, so its contents are the default ones:

uwsgi_param     QUERY_STRING            $query_string;
uwsgi_param     REQUEST_METHOD          $request_method;
uwsgi_param     CONTENT_TYPE            $content_type;
uwsgi_param     CONTENT_LENGTH          $content_length;

uwsgi_param     REQUEST_URI             $request_uri;
uwsgi_param     PATH_INFO               $document_uri;
uwsgi_param     DOCUMENT_ROOT           $document_root;
uwsgi_param     SERVER_PROTOCOL         $server_protocol;
uwsgi_param     UWSGI_SCHEME            $scheme;

uwsgi_param     REMOTE_ADDR             $remote_addr;
uwsgi_param     REMOTE_PORT             $remote_port;
uwsgi_param     SERVER_PORT             $server_port;
uwsgi_param     SERVER_NAME             $server_name;

My server definition in /etc/nginx/sites-available/www looks like this:

server {
    listen 8080;
    server_name myapp;

    root /var/www/myapp;
    try_files $uri @uwsgi;
    location @uwsgi {
        include uwsgi_params;
        uwsgi_pass unix:/tmp/myapp.sock;
    }
}

Does anybody know what I'm doing wrong here? Why doesn't this run? All tips are welcome!