anchor.diff:  
     ovh = callPackage ../development/python-modules/ovh { };
   
  -  ovito = toPythonModule (pkgs.libsForQt5.callPackage ../development/python-modules/ovito { pythonPackages = self; });
  +  ovito = toPythonModule (libsForQt5.callPackage ../development/python-modules/ovito { pythonPackages = self; });
   
     owslib = callPackage ../development/python-modules/owslib { };
   
  
positive.code: 
    maya = callPackage ../development/python-modules/maya { };
  
    mayavi = pkgs.libsForQt5.callPackage ../development/python-modules/mayavi {
      inherit buildPythonPackage isPy27 fetchPypi;
      inherit (self) pyface pygments numpy vtk traitsui envisage apptools pyqt5;
    };
  
negative.code: }:
  
  with pkgs.lib;
  
  let
    qt5 = pkgs.qt514;
    libsForQt5 = pkgs.libsForQt514;
  in
  
  let
    packages = ( self:
  