Andreas Fabri

I saw that you changed it in ThirdParties.txt,. So all which remains to do is to ask Nicolas to upgrade the testsuite machines.

more errors: ```` 35>C:\CGAL_ROOT\CGAL-6.1-Ic-73\include\CGAL/Constrained_Delaunay_triangulation_2.h(912): error C2244: 'CGAL::Constrained_Delaunay_triangulation_2::virtual_insert': unable to match function definition to an existing declaration [C:\CGAL_ROOT\CGAL-6.1-Ic-73\cmake\platforms\MSVC2017-Release-64bits\test\Triangulation_2\issue_3447.vcxproj] C:\CGAL_ROOT\CGAL-6.1-Ic-73\include\CGAL/Constrained_Delaunay_triangulation_2.h(907): note: see declaration of 'CGAL::Constrained_Delaunay_triangulation_2::virtual_insert' C:\CGAL_ROOT\CGAL-6.1-Ic-73\include\CGAL/Constrained_Delaunay_triangulation_2.h(912): note: definition C:\CGAL_ROOT\CGAL-6.1-Ic-73\include\CGAL/Constrained_Delaunay_triangulation_2.h(912): note: 'Constrained_Delaunay_triangulation_2::Vertex_handle CGAL::Constrained_Delaunay_triangulation_2::virtual_insert(const...

``` Meshing the triangulation with size 0...C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.16.27023\include\xtree(275) : Assertion failed: map/set iterators incompatible ``` [here](https://cgal.geometryfactory.com/CGAL/testsuite/CGAL-6.1-Ic-74/Mesh_2/TestReport_Christo_MSVC2017-Debug-64bits.gz)

``` /mnt/testsuite/include/CGAL/Triangulation_2/internal/Polyline_constraint_hierarchy_2.h:129:61: error: static assertion failed 129 | BOOST_STL_INTERFACES_STATIC_ASSERT_CONCEPT(Point_it, std::bidirectional_iterator); ``` [here](https://cgal.geometryfactory.com/CGAL/testsuite/CGAL-6.1-Ic-74/Mesh_2/TestReport_lrineau_Ubuntu-GCC_master_CXX20-Release.gz)

``` include\CGAL/Base_with_time_stamp.h(23): error C2248: 'CGAL::Constrained_triangulation_face_base_2::Base': cannot access private typedef declared in class 'CGAL::Constrained_triangulation_face_base_2' ``` [here](https://cgal.geometryfactory.com/CGAL/testsuite/CGAL-6.1-Ic-74/Triangulation_2/TestReport_Christo_MSVC2017-Debug-64bits.gz)

We have to remove the files of [`GLFW/vendor`]([Basic_viewer/include/CGAL/GLFW/vendor/glfw/README.md](https://github.com/CGAL/cgal/pull/8444/files#diff-3044a275c7e4558823397345bfc120c2c5fab01df259a26fbc95a49d1b1231c8)) This should be a third party software that we just link with. Or do I miss something?

Can we not identify three points which are maximal un-collinear, by computing Eigen values/vectors ?

You probably had `typedef CGAL::Triangulation_euclidean_traits_2 Gt;` Just remove this `typedef` and use `K` where you write `Gt`. That is `typedef CGAL::Triangulation_vertex_base_with_info_2 Vertex_base;` etc.