anchor.diff:  
     vega_datasets = callPackage ../development/python-modules/vega_datasets { };
   
  -  virtkey = callPackage ../development/python-modules/virtkey { };
  +  virtkey = callPackage ../development/python-modules/virtkey {
  +    inherit (pkgs) pkgconfig;
  +  };
   
     virtual-display = callPackage ../development/python-modules/virtual-display { };
   
  
positive.code: 
    dot2tex = callPackage ../development/python-modules/dot2tex { };
  
    poezio = callPackage ../applications/networking/instant-messengers/poezio { };
  
    potr = callPackage ../development/python-modules/potr {};
  
  
negative.code: 
    kmsxx = (callPackage ../development/libraries/kmsxx {
      inherit (pkgs.kmsxx) stdenv;
      inherit (pkgs) pkgconfig;
    }).overrideAttrs (oldAttrs: {
      name = "${python.libPrefix}-${pkgs.kmsxx.name}";
    });
  