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:     inherit (pkgs) pkgconfig;
    };
  
    pycangjie = disabledIf (!isPy3k) (callPackage ../development/python-modules/pycangjie { });
  
    pycrc = callPackage ../development/python-modules/pycrc { };
  
  
negative.code: 
    kmsxx = (callPackage ../development/libraries/kmsxx {
      inherit (pkgs.kmsxx) stdenv;
      inherit (pkgs) pkgconfig;
    }).overrideAttrs (oldAttrs: {
      name = "${python.libPrefix}-${pkgs.kmsxx.name}";
    });
  