diff --git a/GraphicsView/demo/Alpha_shapes_2/CMakeLists.txt b/GraphicsView/demo/Alpha_shapes_2/CMakeLists.txt
index 427db11e3f8..493816e8e25 100644
--- a/GraphicsView/demo/Alpha_shapes_2/CMakeLists.txt
+++ b/GraphicsView/demo/Alpha_shapes_2/CMakeLists.txt
@@ -12,7 +12,7 @@ find_package(CGAL COMPONENTS Qt5)
 
 include(${CGAL_USE_FILE})
 
-find_package(Qt5 COMPONENTS Xml Script OpenGL)
+find_package(Qt5 COMPONENTS Xml Script OpenGL Svg)
 include_directories (BEFORE ../../include)
 include_directories (BEFORE ./include)
 
@@ -34,7 +34,7 @@ qt5_generate_moc( Alpha_shapes_2.cpp Alpha_shapes_2.moc )
 # The executable itself.
 add_executable  ( Alpha_shapes_2 Alpha_shapes_2.cpp Alpha_shapes_2.moc ${DT_UI_FILES} ${DT_RESOURCE_FILES} )
 
-qt5_use_modules(Alpha_shapes_2 Xml Script OpenGL)
+qt5_use_modules(Alpha_shapes_2 Xml Script OpenGL Svg)
 
 add_to_cached_list( CGAL_EXECUTABLE_TARGETS Alpha_shapes_2 )
 
diff --git a/GraphicsView/demo/Apollonius_graph_2/CMakeLists.txt b/GraphicsView/demo/Apollonius_graph_2/CMakeLists.txt
index c4fd1385a98..19cedbca651 100644
--- a/GraphicsView/demo/Apollonius_graph_2/CMakeLists.txt
+++ b/GraphicsView/demo/Apollonius_graph_2/CMakeLists.txt
@@ -12,7 +12,7 @@ find_package(CGAL REQUIRED COMPONENTS Qt5)
 
 include(${CGAL_USE_FILE})
 
-find_package(Qt5 COMPONENTS Xml Script OpenGL )
+find_package(Qt5 COMPONENTS Xml Script OpenGL Svg)
 include_directories (BEFORE ../../include)
 
 
@@ -32,7 +32,7 @@ qt5_generate_moc( Apollonius_graph_2.cpp Apollonius_graph_2.moc )
 # The executable itself.
 add_executable  ( Apollonius_graph_2 Apollonius_graph_2.cpp Apollonius_graph_2.moc ${DT_UI_FILES} ${DT_RESOURCE_FILES} )
 
-qt5_use_modules(Apollonius_graph_2 Xml Script OpenGL)
+qt5_use_modules(Apollonius_graph_2 Xml Script OpenGL Svg)
 
 add_to_cached_list( CGAL_EXECUTABLE_TARGETS Apollonius_graph_2 )
 
diff --git a/Polyhedron/demo/Polyhedron/Polyhedron_demo_trivial_plugin.cpp b/Polyhedron/demo/Polyhedron/Polyhedron_demo_trivial_plugin.cpp
index 0ef8c6b7b96..fd8b9fdf64b 100644
--- a/Polyhedron/demo/Polyhedron/Polyhedron_demo_trivial_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Polyhedron_demo_trivial_plugin.cpp
@@ -57,7 +57,7 @@ public:
         attrib_buffers(viewer, PROGRAM_WITHOUT_LIGHT);
         program->bind();
         program->setAttributeValue("colors", this->color());
-        qFunc.glDrawArrays(GL_LINES, 0, positions_lines.size()/3);
+        qFunc.glDrawArrays(GL_LINES, 0, static_cast<GLsizei>(positions_lines.size()/3));
         vaos[0]->release();
         program->release();
 
@@ -83,7 +83,8 @@ private:
 
             vaos[0]->bind();
             buffers[0].bind();
-            buffers[0].allocate(positions_lines.data(), positions_lines.size()*sizeof(float));
+            buffers[0].allocate(positions_lines.data(),
+                                static_cast<GLsizei>(positions_lines.size()*sizeof(float)));
             program->enableAttributeArray("vertex");
             program->setAttributeBuffer("vertex",GL_FLOAT,0,3);
             buffers[0].release();