diff --git a/.travis/build_package.sh b/.travis/build_package.sh
index 12f6082c922..0d275ee5885 100755
--- a/.travis/build_package.sh
+++ b/.travis/build_package.sh
@@ -7,30 +7,6 @@ CXX_FLAGS="-DCGAL_NDEBUG -ftemplate-backtrace-limit=0"
 function mytime {
   /usr/bin/time -f "Spend time of %C: %E (real)" "$@"
 }
-
-function build_examples {
-  mkdir -p build-travis
-  cd build-travis
-  mytime cmake -DCGAL_DIR="/usr/local/lib/cmake/CGAL" -DCMAKE_CXX_FLAGS="${CXX_FLAGS}" ..
-  mytime make -j2 VERBOSE=1
-}
-
-function build_tests {
-  build_examples
-}
-
-function build_demo {
-  mkdir -p build-travis
-  cd build-travis
-  EXTRA_CXX_FLAGS=
-  case "$CC" in
-    clang*)
-      EXTRA_CXX_FLAGS="-Werror=inconsistent-missing-override"
-      ;;
-  esac
-  mytime cmake -DCGAL_DIR="/usr/local/lib/cmake/CGAL" -DCGAL_DONT_OVERRIDE_CMAKE_FLAGS:BOOL=ON -DCMAKE_CXX_FLAGS="${CXX_FLAGS} ${EXTRA_CXX_FLAGS}"  ..
-  mytime make -j2 VERBOSE=1
-}
 old_IFS=$IFS
 IFS=$' '
 ROOT="$PWD/.."
@@ -93,7 +69,25 @@ cd $ROOT
           exit 1
     fi
     echo "Matrix is up to date."
-    exit 0
+     #check if non standard cgal installation works
+    cd $ROOT
+    mkdir build_test
+    cd build_test
+    mytime cmake -DCMAKE_INSTALL_PREFIX=install/ -DCGAL_BUILD_THREE_DOC=TRUE ..
+    mytime make install
+    # test install with minimal downstream example
+    mkdir installtest
+    cd installtest
+    touch main.cpp
+    mkdir build
+    echo 'project(Example)' >> CMakeLists.txt
+    echo 'set(PROJECT_SRCS ${PROJECT_SOURCE_DIR}/main.cpp)' >> CMakeLists.txt
+    echo 'find_package(CGAL REQUIRED)' >> CMakeLists.txt
+    echo 'add_executable(${PROJECT_NAME} ${PROJECT_SRCS})' >> CMakeLists.txt
+    echo 'target_link_libraries(${PROJECT_NAME} CGAL::CGAL)' >> CMakeLists.txt
+    echo '#include "CGAL/remove_outliers.h"' >> main.cpp
+    cd build
+    mytime cmake -DCMAKE_INSTALL_PREFIX=../../install -DCGAL_BUILD_THREE_DOC=TRUE ..
   fi
 
   if [ "$ARG" = "Installation" ]
@@ -116,7 +110,7 @@ cd $ROOT
 
   IFS=$old_IFS
 
-  if [ -n "$TRAVIS_PULL_REQUEST_BRANCH" ] && [ "$ARG" != Polyhedron_demo ]; then
+  if [ -n "$TRAVIS_PULL_REQUEST_BRANCH" ]; then
     DO_IGNORE=FALSE
     . $ROOT/.travis/test_package.sh "$ROOT" "$ARG"
     echo "DO_IGNORE is $DO_IGNORE"
@@ -125,67 +119,22 @@ cd $ROOT
     fi
   fi
   IFS=$' '
-  EXAMPLES="$ARG/examples/$ARG"
-  TEST="$ARG/test/$ARG"
-  DEMOS=$ROOT/$ARG/demo/*
-
-  if [ -d "$ROOT/$EXAMPLES" ]
-  then
-    cd $ROOT/$EXAMPLES
-    if [ -f ./CMakeLists.txt ]; then
-      build_examples
-    else
-      for dir in ./*
-      do
-        if [ -f $dir/CMakeLists.txt ]; then
-          cd $ROOT/$EXAMPLES/$dir
-          build_examples
-        fi
-      done
-    fi
-  elif [ "$ARG" != Polyhedron_demo ]; then
-    echo "No example found for $ARG"
+  mkdir -p build-travis
+  cd build-travis
+  WITHDEMOS=ON
+  if [ "$ARG" = "Polyhedron" ]; then
+    WITHDEMOS=OFF
   fi
+  EXTRA_CXX_FLAGS=
+  case "$CC" in
+    clang*)
+      EXTRA_CXX_FLAGS="-Werror=inconsistent-missing-override"
+      ;;
+  esac
 
-  if [ -d "$ROOT/$TEST" ]
-  then
-    cd $ROOT/$TEST
-    if [ -f ./CMakeLists.txt ]; then
-      build_tests
-    else
-      for dir in ./*
-      do
-        if [ -f $dir/CMakeLists.txt ]; then
-          cd $ROOT/$TEST/$dir
-          build_tests
-        fi
-      done
-    fi
-  elif [ "$ARG" != Polyhedron_demo ]; then
-    echo "No test found for $ARG"
-  fi
-  #Packages like Periodic_3_triangulation_3 contain multiple demos
-  for DEMO in $DEMOS; do
-    DEMO=${DEMO#"$ROOT"}
-    echo $DEMO
-    #If there is no demo subdir, try in GraphicsView
-    if [ ! -d "$ROOT/$DEMO" ] || [ ! -f "$ROOT/$DEMO/CMakeLists.txt" ]; then
-     DEMO="GraphicsView/demo/$ARG"
-    fi
-    if [ "$ARG" != Polyhedron ] && [ -d "$ROOT/$DEMO" ]
-    then
-      cd $ROOT/$DEMO
-      build_demo
-    elif [ "$ARG" != Polyhedron_demo ]; then
-      echo "No demo found for $ARG"
-    fi
-  done
-  if [ "$ARG" = Polyhedron_demo ]; then
-    DEMO=Polyhedron/demo/Polyhedron
-    cd "$ROOT/$DEMO"
-    build_demo
-  fi
 
+  mytime cmake -DCMAKE_CXX_FLAGS="${CXX_FLAGS} ${EXTRA_CXX_FLAGS}" -DCGAL_DONT_OVERRIDE_CMAKE_FLAGS:BOOL=ON -DBUILD_TESTING=ON -DWITH_tests=ON -DWITH_examples=ON -DWITH_demos=$WITHDEMOS ..
+  mytime ctest -j2 -L $ARG'([_][A-Z]|$)'  -E execution___of__ --output-on-failure
 done
 IFS=$old_IFS
 # Local Variables:
diff --git a/Kernel_23/include/CGAL/Weighted_point_2.h b/Kernel_23/include/CGAL/Weighted_point_2.h
index 0b9919d784b..d6b05f0fa35 100644
--- a/Kernel_23/include/CGAL/Weighted_point_2.h
+++ b/Kernel_23/include/CGAL/Weighted_point_2.h
@@ -171,7 +171,7 @@ public:
 
   Weighted_point_2 transform(const Aff_transformation_2 &t) const
   {
-    return Weighted_point_2(t.transform(point(),weight()));
+    return Weighted_point_2(t.transform(point()),weight());
   }
 
 };
diff --git a/Kernel_23/include/CGAL/Weighted_point_3.h b/Kernel_23/include/CGAL/Weighted_point_3.h
index e03a8b651b3..fa7e525040c 100644
--- a/Kernel_23/include/CGAL/Weighted_point_3.h
+++ b/Kernel_23/include/CGAL/Weighted_point_3.h
@@ -186,7 +186,7 @@ public:
 
   Weighted_point_3 transform(const Aff_transformation_3 &t) const
   {
-    return Weighted_point_3(t.transform(point(),weight()));
+    return Weighted_point_3(t.transform(point()),weight());
   }
 
 };
diff --git a/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_aff_transformation_2.h b/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_aff_transformation_2.h
index 4f28ca3ef2a..31f104419fb 100644
--- a/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_aff_transformation_2.h
+++ b/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_aff_transformation_2.h
@@ -63,6 +63,8 @@ _test_cls_aff_transformation_2(const R& )
  CGAL::Point_2<R>  p3( n1, n0, n4 );        // (-3, 0)
  CGAL::Point_2<R>  p4( n7, n2,-n6 );        // ( 4,11)
 
+ CGAL::Weighted_point_2<R>  wp4( p4, n1 );
+
  CGAL::Direction_2<R> d0(n13, n0);
  CGAL::Direction_2<R> d1(n0, n13);
  CGAL::Direction_2<R> dir = (p2 - p4).direction();
@@ -72,6 +74,7 @@ _test_cls_aff_transformation_2(const R& )
  CGAL::Point_2<R>   tp2;
  CGAL::Point_2<R>   tp3;
  CGAL::Point_2<R>   tp4;
+ CGAL::Weighted_point_2<R>   twp4;
  CGAL::Segment_2<R> seg(p1,p2);
  CGAL::Segment_2<R> tseg;
  CGAL::Ray_2<R>     ray(p3,p2);
@@ -160,11 +163,14 @@ _test_cls_aff_transformation_2(const R& )
     tp2 = p2.transform( a[i] );
     tp3 = p3.transform( a[i] );
     tp4 = p4.transform( a[i] );
+    twp4 = wp4.transform( a[i] );
     tseg = seg.transform( a[i] );
     tray = ray.transform( a[i] );
     tlin = lin.transform( a[i] );
     ttri = tri.transform( a[i] );
     tisor= isor.transform( a[i]);
+    assert( twp4.point() == tp4 );
+    assert( twp4.weight() == wp4.weight() );
     assert( tseg == CGAL::Segment_2<R>(tp1, tp2) );
     assert( tray == CGAL::Ray_2<R>(tp3, tp2) );
     assert( tlin == CGAL::Line_2<R>(tp2, tp4) || nonexact);
@@ -173,11 +179,13 @@ _test_cls_aff_transformation_2(const R& )
 
     inv = a[i].inverse();
     tp4  = tp4.transform(  inv );
+    twp4 = twp4.transform( inv );
     tseg = tseg.transform( inv );
     tray = tray.transform( inv );
     tlin = tlin.transform( inv );
     ttri = ttri.transform( inv );
     assert( tp4  == p4  || nonexact );
+    assert( twp4 == wp4 || nonexact );
     assert( tseg == seg || nonexact );
     assert( tray == ray || nonexact );
     assert( tlin == lin || nonexact );
diff --git a/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_aff_transformation_3.h b/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_aff_transformation_3.h
index 972bc417ac1..c10c07d1b1c 100644
--- a/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_aff_transformation_3.h
+++ b/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_aff_transformation_3.h
@@ -61,6 +61,7 @@ _test_cls_aff_transformation_3(const R& )
  CGAL::Point_3<R>  p2( n5, n4,-n12, n4 );   // ( 5, 1,-4)
  CGAL::Point_3<R>  p3( n1, n0, n14, n4 );   // (-3, 0, 7)
  CGAL::Point_3<R>  p4( n7, n2, n8, -n6 );   // ( 4,11, 9)
+ CGAL::Weighted_point_3<R> wp4( p4, n7 );
 
  CGAL::Direction_3<R> d0(n13, n0, n0);
  CGAL::Direction_3<R> d1(n0, n13, n0);
@@ -75,6 +76,7 @@ _test_cls_aff_transformation_3(const R& )
  CGAL::Point_3<R>   tp2;
  CGAL::Point_3<R>   tp3;
  CGAL::Point_3<R>   tp4;
+ CGAL::Weighted_point_3<R>   twp4;
  CGAL::Segment_3<R> seg(p1,p2);
  CGAL::Segment_3<R> tseg;
  CGAL::Ray_3<R>     ray(p3,p2);
@@ -174,12 +176,15 @@ _test_cls_aff_transformation_3(const R& )
     tp2 = p2.transform( a[i] );
     tp3 = p3.transform( a[i] );
     tp4 = p4.transform( a[i] );
+    twp4 = wp4.transform( a[i] );
     tpla = pla.transform( a[i] );
     tseg = seg.transform( a[i] );
     tray = ray.transform( a[i] );
     tlin = lin.transform( a[i] );
     ttri = tri.transform( a[i] );
     ttet = tet.transform( a[i] );
+    assert( twp4.point() == tp4 );
+    assert( twp4.weight() == wp4.weight() );
     assert( tpla == CGAL::Plane_3<R>( tp1, tp2, tp3) || nonexact );
     assert( tseg == CGAL::Segment_3<R>(tp1, tp2) );
     assert( tray == CGAL::Ray_3<R>(tp3, tp2) );
@@ -188,6 +193,7 @@ _test_cls_aff_transformation_3(const R& )
     assert( ttet == CGAL::Tetrahedron_3<R>(tp1, tp2, tp3, tp4) );
     inv = a[i].inverse();
     tp4  = tp4.transform(  inv );
+    twp4 = twp4.transform( inv );
     tpla = tpla.transform( inv );
     tseg = tseg.transform( inv );
     tray = tray.transform( inv );
@@ -195,6 +201,7 @@ _test_cls_aff_transformation_3(const R& )
     ttri = ttri.transform( inv );
     ttet = ttet.transform( inv );
     assert( tp4  == p4 || nonexact );
+    assert( twp4 == wp4 || nonexact );
     assert( tpla == pla || nonexact );
     assert( tseg == seg || nonexact );
     assert( tray == ray || nonexact );
diff --git a/Surface_mesh_skeletonization/include/CGAL/Mean_curvature_flow_skeletonization.h b/Surface_mesh_skeletonization/include/CGAL/Mean_curvature_flow_skeletonization.h
index 3a799e96393..7555eebd77b 100644
--- a/Surface_mesh_skeletonization/include/CGAL/Mean_curvature_flow_skeletonization.h
+++ b/Surface_mesh_skeletonization/include/CGAL/Mean_curvature_flow_skeletonization.h
@@ -1296,6 +1296,7 @@ private:
     }
 
     typedef std::pair<Exact_point, vertex_descriptor> Pair_type;
+    std::vector<Pair_type> duplicated_points;
     for(const Pair_type& p : points)
     {
       std::size_t vid = get(m_vertex_id_pmap, p.second);
@@ -1320,9 +1321,23 @@ private:
           max_neg_t = t;
         }
       }
-
-      p.second->pole = cell_dual[max_neg_i];
+      // max_neg_i is -1 only when duplicated the point is duplicated
+      // (null edge or non-manifold issue resolved with duplication)
+      if (max_neg_i!=-1)
+        p.second->pole = cell_dual[max_neg_i];
+      else
+        duplicated_points.push_back(p);
     }
+
+    for (const Pair_type& p : duplicated_points)
+    {
+      typename Delaunay::Locate_type lt;
+      int li, lj;
+      typename Delaunay::Cell_handle cell = T.locate (p.first, lt, li, lj);
+      CGAL_assertion(lt==Delaunay::VERTEX);
+      p.second->pole = cell->vertex(li)->info()->pole; // copy the pole of the point present in the DT3
+    }
+
     m_are_poles_computed = true;
   }