diff --git a/meshing/packages/magix3d/package.py b/meshing/packages/magix3d/package.py
index e378e79..9cee909 100644
--- a/meshing/packages/magix3d/package.py
+++ b/meshing/packages/magix3d/package.py
@@ -36,14 +36,14 @@ class Magix3d(CMakePackage):
     version('2.2.6', sha256='9d39dd74a1b9360a5ca2790f2d9e8b17429f82833df2d633b57c866383873d05')
     version('2.2.5')
 
-    depends_on('guitoolkitsvariables', type=('build'))
-    depends_on('tkutil')
-    depends_on('vtkcontrib@4: +shared', type=('build', 'link'))
-    depends_on('preferences@5: +shared', type=('build', 'link'))
-    depends_on('pythonutil@5: +shared', type=('build', 'link'))
+    depends_on('guitoolkitsvariables@1.6.0:', type=('build'))
+    depends_on('tkutil@6:')
+    depends_on('vtkcontrib@5: +shared', type=('build', 'link'))
+    depends_on('preferences@6: +shared', type=('build', 'link'))
+    depends_on('pythonutil@6: +shared', type=('build', 'link'))
     depends_on('qqualif+gmds', type=('build', 'link'))
-    depends_on('qtpython@4: +shared', type=('build', 'link'))
-    depends_on('qtvtk@7: +shared', type=('build', 'link'))
+    depends_on('qtpython@6: +shared', type=('build', 'link'))
+    depends_on('qtvtk@8: +shared', type=('build', 'link'))
     depends_on('cgns', type=('build', 'link'))
     depends_on('gmds+lima+cgns', type=('build', 'link'))
     depends_on('gts', type=('build', 'link'))
diff --git a/meshing/packages/qqualif/package.py b/meshing/packages/qqualif/package.py
index 74ccedd..2aef7c6 100644
--- a/meshing/packages/qqualif/package.py
+++ b/meshing/packages/qqualif/package.py
@@ -19,13 +19,14 @@ class Qqualif(CMakePackage):
     depends_on('guitoolkitsvariables', type=('build'))
     depends_on('qwtcharts@4: ~shared', type=('build', 'link'), when='~shared')
     depends_on('qwtcharts@4: +shared', type=('build', 'link'), when='+shared')
-    depends_on('vtkcontrib@4: ~shared', type=('build', 'link'), when='~shared+vtk')
-    depends_on('vtkcontrib@4: +shared', type=('build', 'link'), when='+shared+vtk')
+#    depends_on('vtkcontrib@4: ~shared', type=('build', 'link'), when='~shared+vtk')
+#    depends_on('vtkcontrib@4: +shared', type=('build', 'link'), when='+shared+vtk')
     depends_on('qualif@2: ~shared', type=('build', 'link'), when='~shared')
     depends_on('qualif@2: +shared', type=('build', 'link'), when='+shared')
     depends_on('gmds', type=('build', 'link'), when='+gmds')
     depends_on('lima', type=('build', 'link'), when='+lima')
-    depends_on('vtk-maillage', type=('build', 'link'), when='+vtk')
+    depends_on('vtk-maillage', type=('build', 'link'), when='+vtk7')
+    depends_on('vtk', type=('build', 'link'), when='+vtk9')
 
 # necessary because it is probably missing in the lima cmake files
 #    depends_on('machine-types', type=('build', 'link'), when='+lima')
@@ -36,7 +37,12 @@ class Qqualif(CMakePackage):
     variant('shared', default=True, description='Creation de bibliotheques dynamiques')
     variant('lima', default=True, description='Utilisation de la structure de maillages Lima')
     variant('gmds', default=True, description='Utilisation de la structure de maillages GMDS')
-    variant('vtk', default=True, description='Utilisation de la structure de maillages VTK')
+# The difficulty with QQualif is that we do or do not want VTK, and that, for VtkContrib and
+# QtVtk, we can use vtk-maillage or vtk 9.
+# The use here of the 2 variants vtk7 and vtk9 allows us to cover these 3 cases.
+    variant('vtk7', default=True, description='Utilisation de la structure de maillages vtkUnstructuredGrid de VTK 7')
+    variant('vtk9', default=False, description='Utilisation de la structure de maillages vtkUnstructuredGrid de VTK 9')
+    conflicts('+vtk7', when='+vtk9')
 
     version('4.6.0', sha256='78fbbbd4919b5b6a96ee684e66baafa074c2a36328829ac120625e1a6540da14')
     version('4.5.0', sha256='ae16c1e0c44a5ad3843e9bc7e6beca3d800ce0c887faf646e06b8f0dfb40363e')
@@ -65,6 +71,7 @@ def cmake_args(self):
         args.append(self.define_from_variant('BUILD_SHARED_LIBS', 'shared'))
         args.append(self.define_from_variant('BUILD_GQLima', 'lima'))
         args.append(self.define_from_variant('BUILD_GQGMDS', 'gmds'))
-        args.append(self.define_from_variant('BUILD_GQVtk', 'vtk'))
+        if self.spec.satisfies('+vtk7') or self.spec.satisfies('+vtk9'):
+            args.append('-DBUILD_GQVtk:BOOL=ON')
 
         return args
diff --git a/meshing/packages/qtvtk/package.py b/meshing/packages/qtvtk/package.py
index fe6d057..bd8fe7a 100644
--- a/meshing/packages/qtvtk/package.py
+++ b/meshing/packages/qtvtk/package.py
@@ -19,11 +19,12 @@ class Qtvtk(CMakePackage):
     depends_on('guitoolkitsvariables', type=('build'))
     depends_on('qtutil@5: +shared', type=('build', 'link'), when='+shared')
     depends_on('qtutil@5: ~shared', type=('build', 'link'), when='~shared')
-    depends_on('vtkcontrib@4: +shared', type=('build', 'link'), when='+shared')
-    depends_on('vtkcontrib@4: ~shared', type=('build', 'link'), when='~shared')
+    depends_on('vtkcontrib@5: +shared', type=('build', 'link'), when='+shared')
+    depends_on('vtkcontrib@5: ~shared', type=('build', 'link'), when='~shared')
     depends_on('preferences', type=('build', 'link'))
     depends_on('qt')
-    depends_on('vtk-maillage +qt', type=('build', 'link'))
+    depends_on('vtk-maillage +qt', type=('build', 'link'), when='^vtkcontrib+vtk7')
+    depends_on('vtk +qt', type=('build', 'link'), when='^vtkcontrib~vtk7')
 
     variant('shared', default=True, description='Creation de bibliotheques dynamiques (defaut:shared, annuler le defaut par ~shared)')
 
diff --git a/meshing/packages/vtkcontrib/package.py b/meshing/packages/vtkcontrib/package.py
index 9ce2e71..8b3e54a 100644
--- a/meshing/packages/vtkcontrib/package.py
+++ b/meshing/packages/vtkcontrib/package.py
@@ -21,7 +21,8 @@ class Vtkcontrib(CMakePackage):
 #    depends_on('vtk@7.1:7.99~opengl2~python~xdmf+qt', type=('build', 'link'))
 #    depends_on('qt@5.9.1', type=('build', 'link'))
     depends_on('guitoolkitsvariables@1.5.99:', type=('build', 'link'))
-    depends_on('vtk-maillage', type=('build', 'link'))
+    depends_on('vtk-maillage', type=('build', 'link'), when='+vtk7')
+    depends_on('vtk@9.3:', type=('build', 'link'), when='~vtk7')
 #   depends_on('mpi', type=('build', 'link'))
 
 # for undefined reference in util-linux/libmount to intl_....
@@ -56,6 +57,7 @@ class Vtkcontrib(CMakePackage):
     depends_on("cxx", type="build")  # generated
 
     variant('shared', default=True, description='Creation de bibliotheques dynamiques (defaut:shared, annuler le defaut par ~shared)')
+    variant('vtk7', default=True, description='Uses VTK v 7.1.1 and its OpenGL 1 backend. In its absence uses VTK 9.3 and its OpenGL 2 backend (does not pass through the GLX channel of ssh).')
 
     def cmake_args(self):
         # Since version 5.4.0 VtkContrib uses common_vtk.cmake of GUIToolkitsVariables which
@@ -63,8 +65,4 @@ def cmake_args(self):
         args = []
         args.append(self.define_from_variant('BUILD_SHARED_LIBS', 'shared'))
 
-        # if OFF does vtkcontrib uses OPENGL2 ?
-        # see VTK_OPENGL_BACKEND in src/VtkContrib/CMakeLists.txt
-        args.append('-DUSE_OPENGL_BACKEND:BOOL=ON')
-
         return args