Hallo!
> might be a problem with gcc 3.4, that's much stricter with the c++ standard
> than earlier gcc versions ...
okay, I found the problem:
<problem>
In a template definition, unqualified names will no longer find members 
of a dependent base (as specified by [temp.dep]/3 in the C++ standard). 
For example,
	template <typename T> struct B {
	  int m;
	  int n;
	  int f ();
	  int g ();
	};
	int n;
	int g ();
	template <typename T> struct C : B<T> {
	  void h ()
	  {
	    m = 0; // error
	    f ();  // error
	    n = 0; // ::n is modified
	    g ();  // ::g is called
	  }
	};
You must make the names dependent, e.g. by prefixing them with this->. 
Here is the corrected definition of C<T>::h,
	template <typename T> void C<T>::h ()
	{
	  this->m = 0;
	  this->f ();
	  this->n = 0
	  this->g ();
	}
</problem>
So I have to write a lot of "this" ... :)
LG
Georg