diff --git a/Algebraic_kernel_d/test/Algebraic_kernel_d/include/CGAL/_test_algebraic_curve_kernel_2.h b/Algebraic_kernel_d/test/Algebraic_kernel_d/include/CGAL/_test_algebraic_curve_kernel_2.h
index e0058dd4c8e..6f67af91aae 100644
--- a/Algebraic_kernel_d/test/Algebraic_kernel_d/include/CGAL/_test_algebraic_curve_kernel_2.h
+++ b/Algebraic_kernel_d/test/Algebraic_kernel_d/include/CGAL/_test_algebraic_curve_kernel_2.h
@@ -93,8 +93,8 @@ void test_algebraic_curve_kernel_2() {
     typedef typename AK_2::Algebraic_real_2 Algebraic_real_2;
 
     typedef typename AK_2::Coordinate_1 Coordinate_1;
-    typedef typename AK_2::Coordinate_2 Coordinate_2;
     CGAL_USE_TYPE(Coordinate_1);
+    typedef typename AK_2::Coordinate_2 Coordinate_2;
     CGAL_USE_TYPE(Coordinate_2);
 
     Poly_2 polys[ACK_2_n_polys];
diff --git a/Circulator/include/CGAL/Circulator/Circulator_concepts.h b/Circulator/include/CGAL/Circulator/Circulator_concepts.h
index 839137eefb9..bd9d298914c 100644
--- a/Circulator/include/CGAL/Circulator/Circulator_concepts.h
+++ b/Circulator/include/CGAL/Circulator/Circulator_concepts.h
@@ -65,8 +65,11 @@ struct ForwardCirculator
 
   BOOST_CONCEPT_USAGE(ForwardCirculator)
   {
-    BOOST_CONCEPT_ASSERT((boost::SignedInteger<difference_type>));
-    BOOST_CONCEPT_ASSERT((boost::Convertible<iterator_category, CGAL::Forward_circulator_tag>));
+    // CGAL_UNUSED is needed with g++ 4.8, otherwise it warns:
+    // "typedef ‘boost_concept_check68’ locally defined but not used
+    // [-Wunused-local-typedefs]"
+    BOOST_CONCEPT_ASSERT((boost::SignedInteger<difference_type>)) CGAL_UNUSED;
+    BOOST_CONCEPT_ASSERT((boost::Convertible<iterator_category, CGAL::Forward_circulator_tag>)) CGAL_UNUSED;
     
     boost::require_boolean_expr(a == NULL);
     boost::require_boolean_expr(a != NULL);
@@ -87,7 +90,7 @@ struct BidirectionalCirculator
 {
   BOOST_CONCEPT_USAGE(BidirectionalCirculator)
   {
-    BOOST_CONCEPT_ASSERT((boost::Convertible<typename C::iterator_category, CGAL::Bidirectional_circulator_tag>));
+    BOOST_CONCEPT_ASSERT((boost::Convertible<typename C::iterator_category, CGAL::Bidirectional_circulator_tag>)) CGAL_UNUSED;
     --a;
     a--;
   }
@@ -101,7 +104,7 @@ struct RandomAccessCirculator
 {
   BOOST_CONCEPT_USAGE(RandomAccessCirculator)
   {
-    BOOST_CONCEPT_ASSERT((boost::Convertible<typename C::iterator_category, CGAL::Random_access_circulator_tag>));
+    BOOST_CONCEPT_ASSERT((boost::Convertible<typename C::iterator_category, CGAL::Random_access_circulator_tag>)) CGAL_UNUSED;
     c += n; // addition
     c = c + n; c = n + c;
     c -= n; // subtraction
diff --git a/Circulator/test/Circulator/circulator_concept_checks.cpp b/Circulator/test/Circulator/circulator_concept_checks.cpp
index 0c204dca385..c0cc24e2fbd 100644
--- a/Circulator/test/Circulator/circulator_concept_checks.cpp
+++ b/Circulator/test/Circulator/circulator_concept_checks.cpp
@@ -12,16 +12,16 @@ int main()
   typedef CGAL::Circulator_from_container< std::vector<int> > Circulator_from_vec;
   typedef CGAL::Circulator_from_container< std::list<int> > Circulator_from_list;
 
-  BOOST_CONCEPT_ASSERT((CGAL::Concepts::RandomAccessCirculator<Circulator_from_vec>));
-  BOOST_CONCEPT_ASSERT((CGAL::Concepts::BidirectionalCirculator<Circulator_from_list>));
+  BOOST_CONCEPT_ASSERT((CGAL::Concepts::RandomAccessCirculator<Circulator_from_vec>)) CGAL_UNUSED;
+  BOOST_CONCEPT_ASSERT((CGAL::Concepts::BidirectionalCirculator<Circulator_from_list>)) CGAL_UNUSED;
 
   typedef CGAL::Circulator_from_iterator<int*> Circulator_from_intp;
   typedef CGAL::Circulator_from_iterator<std::vector<int>::iterator> Circulator_from_veci;
   typedef CGAL::Circulator_from_iterator<std::list<int>::iterator> Circulator_from_listi;
   
-  BOOST_CONCEPT_ASSERT((CGAL::Concepts::RandomAccessCirculator<Circulator_from_intp>));
-  BOOST_CONCEPT_ASSERT((CGAL::Concepts::RandomAccessCirculator<Circulator_from_veci>));
-  BOOST_CONCEPT_ASSERT((CGAL::Concepts::BidirectionalCirculator<Circulator_from_listi>));
+  BOOST_CONCEPT_ASSERT((CGAL::Concepts::RandomAccessCirculator<Circulator_from_intp>)) CGAL_UNUSED;
+  BOOST_CONCEPT_ASSERT((CGAL::Concepts::RandomAccessCirculator<Circulator_from_veci>)) CGAL_UNUSED;
+  BOOST_CONCEPT_ASSERT((CGAL::Concepts::BidirectionalCirculator<Circulator_from_listi>)) CGAL_UNUSED;
 
   return 0;
 }
diff --git a/Number_types/test/Number_types/Sqrt_extension.h b/Number_types/test/Number_types/Sqrt_extension.h
index 0d6f43d0ecb..1b98162acf6 100644
--- a/Number_types/test/Number_types/Sqrt_extension.h
+++ b/Number_types/test/Number_types/Sqrt_extension.h
@@ -180,6 +180,8 @@ template < class AT, class ACDE_TAG>
 void sqrt_ext_pretty_output_test(){
     typedef typename AT::Integer Integer;
     typedef CGAL::Sqrt_extension<Integer,Integer>  EXT1;
+    typedef CGAL::Sqrt_extension<EXT1,Integer> EXT2;
+    CGAL_USE_TYPE(EXT2);
     // TEST without Parens_as_product_tag
     {
         std::stringstream ss;
@@ -417,6 +419,8 @@ void fraction_traits_test(){
         
     typedef CGAL::Fraction_traits<INT1_EXT> INT_FT1;
     typedef CGAL::Fraction_traits<INT2_EXT> INT_FT2;
+    typedef CGAL::Fraction_traits<INT3_EXT> INT_FT3;
+    CGAL_USE_TYPE(INT_FT3);
         
     // RAT_FTs decomposable
     assert((boost::is_same< typename RAT_FT1::Is_fraction, 
diff --git a/Number_types/test/Number_types/test_nt_Coercion_traits.cpp b/Number_types/test/Number_types/test_nt_Coercion_traits.cpp
index 07c4ff8fe43..cb7b3bbcbe6 100644
--- a/Number_types/test/Number_types/test_nt_Coercion_traits.cpp
+++ b/Number_types/test/Number_types/test_nt_Coercion_traits.cpp
@@ -177,9 +177,9 @@ void AT_coercion_test_for_cgal_types_rat(){
     
     typedef CGAL::Sqrt_extension<Integer  , Integer> Extn_1;  
     typedef CGAL::Sqrt_extension<Extn_1   , Extn_1 > Extn_2n;
+    CGAL_USE_TYPE(Extn_2n);
     typedef CGAL::Sqrt_extension<Extn_1   , Integer> Extn_2d;
-    CGAL_USE_TYPE(Extn_2d); CGAL_USE_TYPE(Extn_2n);
-
+    CGAL_USE_TYPE(Extn_2d);
 
     typedef CGAL::Sqrt_extension<Rational  , Integer> Extn_rat_int; 
     CGAL::test_explicit_interoperable_from_to<int         ,Extn_rat_int>();
diff --git a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/include/CGAL/_test_cls_periodic_3_triangulation_3.h b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/include/CGAL/_test_cls_periodic_3_triangulation_3.h
index 3a506dfcd26..764e9fc82a4 100644
--- a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/include/CGAL/_test_cls_periodic_3_triangulation_3.h
+++ b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/include/CGAL/_test_cls_periodic_3_triangulation_3.h
@@ -62,35 +62,53 @@ _test_cls_periodic_3_triangulation_3(const PeriodicTriangulation &,
   typedef typename P3T3::Offset                  Offset;
   typedef typename P3T3::Iso_cuboid              Iso_cuboid;
   typedef typename P3T3::Covering_sheets         Covering_sheets;
+  CGAL_USE_TYPE(Covering_sheets);
 
   typedef typename P3T3::Point                   Point;
   typedef typename P3T3::Segment                 Segment;
   typedef typename P3T3::Triangle                Triangle;
   typedef typename P3T3::Tetrahedron             Tetrahedron;
+  CGAL_USE_TYPE(Segment);
+  CGAL_USE_TYPE(Triangle);
+  CGAL_USE_TYPE(Tetrahedron);
 
   typedef typename P3T3::Periodic_point          Periodic_point;
   typedef typename P3T3::Periodic_segment        Periodic_segment;
   typedef typename P3T3::Periodic_triangle       Periodic_triangle;
   typedef typename P3T3::Periodic_tetrahedron    Periodic_tetrahedron;
+  CGAL_USE_TYPE(Periodic_point);
+  CGAL_USE_TYPE(Periodic_segment);
+  CGAL_USE_TYPE(Periodic_triangle);
+  CGAL_USE_TYPE(Periodic_tetrahedron);
 
   typedef typename P3T3::Vertex                  Vertex;
   typedef typename P3T3::Cell                    Cell;
   typedef typename P3T3::Edge                    Edge;
   typedef typename P3T3::Facet                   Facet;
+  CGAL_USE_TYPE(Vertex);
+  CGAL_USE_TYPE(Cell);
 
   typedef typename P3T3::Vertex_handle           Vertex_handle;
   typedef typename P3T3::Cell_handle             Cell_handle; 
 
   typedef typename P3T3::size_type               size_type;
   typedef typename P3T3::difference_type         difference_type;
+  CGAL_USE_TYPE(size_type);
+  CGAL_USE_TYPE(difference_type);
 
   typedef typename P3T3::Cell_iterator           Cell_iterator;
   typedef typename P3T3::Facet_iterator          Facet_iterator;
   typedef typename P3T3::Edge_iterator           Edge_iterator;
   typedef typename P3T3::Vertex_iterator         Vertex_iterator;
+  CGAL_USE_TYPE(Cell_iterator);
+  CGAL_USE_TYPE(Facet_iterator);
+  CGAL_USE_TYPE(Edge_iterator);
+  CGAL_USE_TYPE(Vertex_iterator);
 
   typedef typename P3T3::Cell_circulator         Cell_circulator;
   typedef typename P3T3::Facet_circulator        Facet_circulator;
+  CGAL_USE_TYPE(Cell_circulator);
+  CGAL_USE_TYPE(Facet_circulator);
 
   typedef typename P3T3::Periodic_tetrahedron_iterator
                                                  Periodic_tetrahedron_iterator;
@@ -99,9 +117,14 @@ _test_cls_periodic_3_triangulation_3(const PeriodicTriangulation &,
   typedef typename P3T3::Periodic_segment_iterator
                                                  Periodic_segment_iterator;
   typedef typename P3T3::Periodic_point_iterator Periodic_point_iterator;
+  CGAL_USE_TYPE(Periodic_tetrahedron_iterator);
+  CGAL_USE_TYPE(Periodic_triangle_iterator);
+  CGAL_USE_TYPE(Periodic_segment_iterator);
+  CGAL_USE_TYPE(Periodic_point_iterator);
 
   typedef typename P3T3::Locate_type             Locate_type;
   typedef typename P3T3::Iterator_type           Iterator_type;
+  CGAL_USE_TYPE(Iterator_type);
 
   std::cout<<"Creating triangulations to test on"<<std::endl;
   std::cout<<"  non-degenerate, 3-sheeted covering"<<std::endl;
diff --git a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/include/CGAL/_test_cls_periodic_3_triangulation_traits_3.h b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/include/CGAL/_test_cls_periodic_3_triangulation_traits_3.h
index c90ee46e841..742f1a964f5 100644
--- a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/include/CGAL/_test_cls_periodic_3_triangulation_traits_3.h
+++ b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/include/CGAL/_test_cls_periodic_3_triangulation_traits_3.h
@@ -31,6 +31,7 @@ void _test_for_given_domain(const Traits & traits,
 {
   typedef typename Traits::Point_3                   Point;
   typedef typename Traits::Vector_3                  Vector;
+  CGAL_USE_TYPE(Vector);
   typedef typename Traits::Periodic_3_offset_3       Offset;
   CGAL_USE_TYPE(typename Traits::Iso_cuboid_3);
   typedef typename Traits::Segment_3                 Segment;