"child exited with status 13" when trying to run fastcgi examples with lighttpd

I have compiled fastcgi c-api examples: http://www.fastcgi.com/devkit/examples/ They work fine when I execute them manually in the command line (by typing ./echo for example) but I have some troubles when I try to make it work with lighttpd.

"/echo.fcgi" =&g开发者_StackOverflow中文版t; (
                  "localhost" => (
                          "socket" => "/tmp/echo.sock",
        "bin-path" => "/Users/onur/Downloads/fcgi-2.4.0/examples/tiny",
                          "check-local" => "disable"
                  ),
          )

new-host:examples onur$ ls -la echo
-rwxr-xr-x  1 _www  _www  3322 Aug  4 21:21 echo

What am I missing? What are the specificities of the execution of a binary with fastcgi in lighttpd?

shouldn't this:

 "bin-path" => "/Users/onur/Downloads/fcgi-2.4.0/examples/tiny",

be something like this, instead?

 "bin-path" => "/Users/onur/Downloads/fcgi-2.4.0/examples/echo",

you are trying to run echo and not tiny, aren't you?