anchor.diff:      libtool = darwin.cctools;
     };
   
  -  rippled = callPackage ../servers/rippled {
  -    boost = boost167;
  -  };
  +  rippled = callPackage ../servers/rippled { };
   
     rippled-validator-keys-tool = callPackage ../servers/rippled/validator-keys-tool.nix {
       boost = boost167.override {
  
positive.code:   k3d = callPackage ../applications/graphics/k3d {
      inherit (pkgs.gnome2) gtkglext;
      stdenv = gcc6Stdenv;
      boost = boost166.override { enablePython = true; };
    };
  
    k9copy = libsForQt5.callPackage ../applications/video/k9copy {};
  
negative.code: 
    file-rename = callPackage ../tools/filesystems/file-rename { };
  
    kea = callPackage ../tools/networking/kea { };
  
    ispell = callPackage ../tools/text/ispell {};
  
  