Lighttpd

I have tried so hard but I cant get fastcgi to work on Ubuntu.

Here is my C++ code and below is the config file with the error. I am NOT using spwan-fcgi.

What is wrong? I dont know even know how to begin. The c++ complies and when run prints out the following

Content-type: text/html

<title>FastCGI Hello!</title><h1>FastCGI Hello!</h1>Request number 2 running on host <i>(null)</i>

server.modules += ( "mod_fastcgi" )
server.document-root = "/var/www/" 
## where to send error-messages to
server.errorlog             = "/etc/lighttpd/error_logs/error.log" 

index-file.names += ( "rtb.fcgi" ) 

##server.max-worker = 1 #Set worker to two times CPU --- workers equal to two times the number of cores 
fastcgi.server = (
    ".fcgi" => (
      "localhost" => ( 
        "socket" => "/tmp/fastcgi.socket",
        "bin-path" => "/var/www/rtb.fcgi" 
      )
    )
)

#include <stdlib.h>
#include <unistd.h>
extern char ** environ;
#include "fcgio.h" 
#include "fcgi_config.h"  // HAVE_IOSTREAM_WITHASSIGN_STREAMBUF
#include "fcgi_stdio.h" 

using namespace std;
int main()
  {
      int count = 1;
      while(FCGI_Accept() >= 0)
          printf("Content-type: text/html\r\n" 
                 "\r\n" 
                 "<title>FastCGI Hello!</title>" 
                 "<h1>FastCGI Hello!</h1>" 
                 "Request number %d running on host <i>%s</i>\n",
                  ++count, getenv("SERVER_NAME"));
      return 0;
  }

2012-01-14 19:34:33: (log.c.166) server started 
2012-01-14 19:34:33: (mod_fastcgi.c.1104) the fastcgi-backend /var/www/rtb.fcgi failed to start: 
2012-01-14 19:34:33: (mod_fastcgi.c.1108) child exited with status 8 /var/www/rtb.fcgi 
2012-01-14 19:34:33: (mod_fastcgi.c.1111) If you're trying to run your app as a FastCGI backend, make sure you're using the FastCGI-enabled version.
If this is PHP on Gentoo, add 'fastcgi' to the USE flags. 
2012-01-14 19:34:33: (mod_fastcgi.c.1399) [ERROR]: spawning fcgi failed. 
2012-01-14 19:34:33: (server.c.938) Configuration of plugins failed. Going down.