[Vala] List with composed type

[Johan <johan wolke7 net>]

Hi,

I want to construct a List (can be any kind of linked list) where each 
element is a struct (or it could be an object):

struct StructType{
      string s1;
      string s2;
      string s3;
  }

var list = new List<StructType> ();

output from valac:
'StructType' is not a supported generic type argument, use `?' to box 
value types

Seems that List does only accept simple types. Is there any simple way 
to implement it without rewriting the whole code of a linked list?
thanks for any help!