anchor.diff:    };
   
     thunderbird-bin = callPackage ../applications/networking/mailreaders/thunderbird-bin {
  -    gconf = pkgs.gnome.GConf;
       inherit (pkgs.gnome) libgnome libgnomeui;
     };
   
  
positive.code: 
    node_webkit = node_webkit_0_9;
  
    nwjs_0_12 = callPackage ../development/tools/node-webkit/nw12.nix {
      gconf = pkgs.gnome.GConf;
    };
  
    node_webkit_0_11 = callPackage ../development/tools/node-webkit/nw11.nix {
      gconf = pkgs.gnome.GConf;
    };
  
    node_webkit_0_9 = callPackage ../development/tools/node-webkit/nw9.nix {
      gconf = pkgs.gnome.GConf;
    };
  
    noweb = callPackage ../development/tools/literate-programming/noweb { };
    nuweb = callPackage ../development/tools/literate-programming/nuweb { tex = texlive.combined.scheme-small; };
  
negative.code: 
    gnucash26 = lowPrio (callPackage ../applications/office/gnucash/2.6.nix {
      inherit (gnome2) libgnomecanvas;
      goffice = goffice_0_8;
      webkit = webkitgtk2;
      guile = guile_1_8;
  