problems with demo_Cgrammar.pl in Parse-RecDescent-1.93??

Hi all

Sorry to bother you and thank-you for reading.
I am in the need of parsing C file, and I'd like to do this with Recdescent.
So I had a look at the demo_Cgrammar.pl provided with Recdescent. But when I run the exemple it doesn't look it likes C code at all:
I get parsing failure (resulting in "Bad C code" message) for C files as simple as:
main()
{
  int a;
}

(The same with: void main(void) {int a;})

Does anyone have tried to parse C with Descent?... In that case, which grammar did you use?

Thanks for you feed-back,

/Christophe.