[Vala] hello world, "symbol lookup error ..."

[ben nukel <ben nukel gmail com>]

hi
I'd like to play with vala a little bit, but I guess there is a fundamental
problem with my really boring example.

$ cat hello.vala  # taken from valas website

   using GLib;
   public class Test.HelloObject : GLib.Object {
           public static int main(string[] args) {
           stdout.printf("Hello, World\n");
        return 0;
    } }

$ valac --version
Vala 0.7.8

$ cat /etc/issue
Ubuntu 9.04

 $ valac hello.vala
valac: symbol lookup error: valac: undefined symbol:
vala_code_context_set_experimental_non_null


any ideas what's wrong here?

thanks
ben