configure nginx for a local cgi

nginx.conf

load_module /usr/lib64/nginx/modules/ngx_http_cgi_module.so;
error_log /dev/stderr;
daemon off;
user rein;

events {}

http {
  access_log /dev/stdout;
  server {
    listen 80 default_server;
    listen [::]:80 default_server;
    location /static {
      alias static;
    }
    location / {
      cgi_pass src/pasterb.slim;
      cgi_interpreter /bin/bundle exec slimrb;
      cgi_stderr /dev/stderr;
    }
  }
}