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I get an error message from "segment_delaunay_graph_vertex_base_2.h" which is 
one of the CGAL 3.3.1 files. I don't understand the error and I can not find 
who cause the problem. The error is:


c:\program 
files\cgal-3.3.1\include\cgal\segment_delaunay_graph_vertex_base_2.h(48) : 
error C2039: 'Geom_traits' : is not a member of 'CGAL::Boolean_tag<b>'
        with
        [
            b=true
        ]
        c:\program 
files\cgal-3.3.1\include\cgal\segment_delaunay_graph_hierarchy_vertex_base_2.h(32)
 : see reference to class template instantiation 'CGAL::Sdgvb2<STraits>' 
being compiled
        with
        [
            STraits=CGAL::Tag_true
        ]
        c:\program 
files\cgal-3.3.1\include\cgal\triangulation_data_structure_2.h(60) : see 
reference to class template instantiation 'CGAL::Sdghvb2<Vbb>' being compiled
        with
        [
            Vbb=CGAL::Sdgvb2<CGAL::Tag_true>
        ]
        c:\program files\cgal-3.3.1\include\cgal\triangulation_2.h(77) : see 
reference to class template instantiation 'CGAL::Tds2<Vb,Fb>' being compiled
        with
        [
            Vb=CGAL::Sdghvb2<CGAL::Sdgvb2<CGAL::Tag_true>>,
            
Fb=CGAL::Tfb<CGAL::Segment_Delaunay_graph_filtered_traits_without_intersections_2<CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::MTag,CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::EMTag>>
        ]
        c:\program 
files\cgal-3.3.1\include\cgal\segment_delaunay_graph_2.h(157) : see reference 
to class template instantiation 'CGAL::Triangulation_2<Gt,Tds>' being compiled
        with
        [
            
Gt=CGAL::Sdgtw2<CGAL::Segment_Delaunay_graph_filtered_traits_without_intersections_2<CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::MTag,CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::EMTag>>,
            
Tds=CGAL::Tds2<CGAL::Sdghvb2<CGAL::Sdgvb2<CGAL::Tag_true>>,CGAL::Tfb<CGAL::Segment_Delaunay_graph_filtered_traits_without_intersections_2<CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::MTag,CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::EMTag>>>
        ]
        c:\program 
files\cgal-3.3.1\include\cgal\segment_delaunay_graph_hierarchy_2.h(66) : see 
reference to class template instantiation 'CGAL::Sdg2<Gt,ST,DS,LTag>' being 
compiled
        with
        [
            
Gt=CGAL::Segment_Delaunay_graph_filtered_traits_without_intersections_2<CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::MTag,CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::EMTag>,
            ST=CGAL::Tag_true,
            
DS=CGAL::Tds2<CGAL::Sdghvb2<CGAL::Sdgvb2<CGAL::Tag_true>>,CGAL::Tfb<CGAL::Segment_Delaunay_graph_filtered_traits_without_intersections_2<CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::MTag,CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::EMTag>>>,
            LTag=CGAL::Tag_false
        ]
        d:\mahmood\visual studio 
2005\projects\vvc2005\include\cgal\polygon_voronoi_diagram_2.h(259) : see 
reference to class template instantiation 'CGAL::Sdgh2<Gt,ST,STag>' being 
compiled
        with
        [
            
Gt=CGAL::Segment_Delaunay_graph_filtered_traits_without_intersections_2<CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::MTag,CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::EMTag>,
            ST=CGAL::Tag_true,
            
STag=CGAL::Tds2<CGAL::Sdghvb2<CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::Segment_Delaunay_graph_vertex_data_2<CGAL::Sdgvb2<CGAL::Segment_Delaunay_graph_filtered_traits_without_intersections_2<CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::MTag,CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::EMTag>,CGAL::Tag_false>,CGAL::Polygon_feature_2>>,CGAL::Tfb<CGAL::Segment_Delaunay_graph_filtered_traits_without_intersections_2<CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::MTag,CGAL::Simple_cartesian<Rational>,CGAL::Polygon_Voronoi_diagram_2<CGAL::Simple_cartesian<Rational>>::EMTag>>>
        ]
        d:\mahmood\visual studio 
2005\projects\vvc2005\include\cgal\polygon_voronoi_diagram_2.h(428) : see 
reference to class template instantiation 
'CGAL::Polygon_Voronoi_diagram_2<Kernel_>::Aux_polygon_Voronoi_diagram_2' 
being compiled
        with
        [
            Kernel_=CGAL::Simple_cartesian<Rational>
        ]
        d:\mahmood\visual studio 
2005\projects\vvc2005\include\cgal\partial_polygon_voronoi_diagram_2.h(20) : 
see reference to class template instantiation 
'CGAL::Polygon_Voronoi_diagram_2<Kernel_>' being compiled
        with
        [
            Kernel_=CGAL::Simple_cartesian<Rational>
        ]
        d:\mahmood\visual studio 
2005\projects\vvc2005\include\cgal\vvc_diagram_2.h(40) : see reference to 
class template instantiation 
'CGAL::Partial_polygon_Voronoi_diagram_2<Traits_>' being compiled
        with
        [
            Traits_=CGAL::Arr_conic_traits_2<Rat_kernel,Alg_kernel,Nt_traits>
        ]
        d:\mahmood\visual studio 
2005\projects\vvc2005\vvc2005\vvc_demo.cpp(8) : see reference to class 
template instantiation 'CGAL::VVc_diagram_2<Traits_,AppKernel_>' being 
compiled
        with
        [
            Traits_=Traits_2,
            AppKernel_=App_kernel
        ]
c:\program 
files\cgal-3.3.1\include\cgal\segment_delaunay_graph_vertex_base_2.h(48) : 
error C2146: syntax error : missing ';' before identifier 'Geom_traits'
c:\program 
files\cgal-3.3.1\include\cgal\segment_delaunay_graph_vertex_base_2.h(48) : 
error C4430: missing type specifier - int assumed. Note: C++ does not support 
default-int
c:\program 
files\cgal-3.3.1\include\cgal\segment_delaunay_graph_vertex_base_2.h(48) : 
error C2602: 'CGAL::Sdgvb2<STraits>::Geom_traits' is not a member of a base 
class of 'CGAL::Sdgvb2<STraits>'
        with
        [
            STraits=CGAL::Tag_true
        ]
        c:\program 
files\cgal-3.3.1\include\cgal\segment_delaunay_graph_vertex_base_2.h(48) : 
see declaration of 'CGAL::Sdgvb2<STraits>::Geom_traits'
        with
        [
            STraits=CGAL::Tag_true
        ]
c:\program 
files\cgal-3.3.1\include\cgal\segment_delaunay_graph_vertex_base_2.h(48) : 
error C2868: 'CGAL::Sdgvb2<STraits>::Geom_traits' : illegal syntax for 
using-declaration; expected qualified-name
        with
        [
            STraits=CGAL::Tag_true
        ]
c:\program 
files\cgal-3.3.1\include\cgal\segment_delaunay_graph_vertex_base_2.h(49) : 
error C2825: 'CGAL::Sdgvb2<STraits>::Geom_traits': must be a class or 
namespace when followed by '::'
        with
        [
            STraits=CGAL::Tag_true
        ]



part of the file which contains this error is:
public:
  // TYPES
  //------
  typedef STraits                                  Storage_traits;
  typedef typename Storage_traits::Geom_traits     Geom_traits;
  typedef typename Geom_traits::Site_2             Site_2;
  typedef typename Storage_traits::Storage_site_2  Storage_site_2;
  typedef DS                                       Data_structure;
...