I'm trying to enable scgi like this:

location /RPC2 {
include scgi_params;
scgi_pass unix:/tmp/rpc.sock;
}

But I get this error when I start nginx:

$ sudo /etc/init.d/nginx start
Starting nginx: nginx: [emerg] unknown directive "scgi_param" in /etc/nginx/scgi_params:1
nginx: configuration file /etc/nginx/nginx.conf test failed

My version of nginx is:

$ nginx -v
nginx version: nginx/1.1.19

So I do have the SCGI module installed.

What gives?