4 files changed, 12 insertions, 1 deletions
diff --git a/src/GudhUI/CMakeLists.txt b/src/GudhUI/CMakeLists.txt
index 64429baa..ca2e47c1 100644
--- a/src/GudhUI/CMakeLists.txt
+++ b/src/GudhUI/CMakeLists.txt
@@ -5,6 +5,10 @@ find_package(Qt5 COMPONENTS Widgets Xml OpenGL)
 find_package(QGLViewer)
 find_package(OpenGL)
 
+if (CGAL_VERSION VERSION_EQUAL 4.8.0)
+  message(ERROR " GudhUI does not compile with CGAL 4.8.0. 4.8.1, 4.8.2 and 4.9 are OK.")
+endif()
+
 if (NOT CGAL_FOUND)
   message(ERROR " GudhUI requires CGAL and will not be compiled.")
 endif()
@@ -23,7 +27,7 @@ endif()
 
 
 
-if ( CGAL_FOUND AND Qt5_FOUND AND OPENGL_FOUND AND QGLVIEWER_FOUND )
+if ( CGAL_FOUND AND Qt5_FOUND AND OPENGL_FOUND AND QGLVIEWER_FOUND AND NOT CGAL_VERSION VERSION_EQUAL 4.8.0)
 
   set(CMAKE_AUTOMOC ON)
   set(CMAKE_AUTOUIC ON)
diff --git a/src/GudhUI/utils/Critical_points.h b/src/GudhUI/utils/Critical_points.h
index b88293e9..2a18e079 100644
--- a/src/GudhUI/utils/Critical_points.h
+++ b/src/GudhUI/utils/Critical_points.h
@@ -105,6 +105,9 @@ template<typename SkBlComplex> class Critical_points {
     if (link.empty())
       return 0;
 
+    Edge_contractor<Complex> contractor(link, link.num_vertices() - 1);
+    (void)contractor;
+
     if (link.num_connected_components() > 1)
       // one than more CC -> not contractible
       return 0;
diff --git a/src/GudhUI/utils/Is_manifold.h b/src/GudhUI/utils/Is_manifold.h
index 6dd7898e..d0974463 100644
--- a/src/GudhUI/utils/Is_manifold.h
+++ b/src/GudhUI/utils/Is_manifold.h
@@ -76,6 +76,8 @@ template<typename SkBlComplex> class Is_manifold {
 
   bool is_k_sphere(Vertex_handle v, int k) {
     auto link = input_complex_.link(v);
+    Edge_contractor<Complex> contractor(link, link.num_vertices() - 1);
+    (void)contractor;
     return (is_sphere_simplex(link) == k);
   }
 
diff --git a/src/GudhUI/utils/Vertex_collapsor.h b/src/GudhUI/utils/Vertex_collapsor.h
index 3f0e7ffd..568dab2f 100644
--- a/src/GudhUI/utils/Vertex_collapsor.h
+++ b/src/GudhUI/utils/Vertex_collapsor.h
@@ -80,6 +80,8 @@ template<typename SkBlComplex> class Vertex_collapsor {
     if (link.empty()) return false;
     if (link.is_cone()) return true;
     if (link.num_connected_components() > 1) return false;
+    Edge_contractor<Complex> contractor(link, link.num_vertices() - 1);
+    (void)contractor;
     return (link.num_vertices() == 1);
   }
 };