anchor.diff:            ++ dev-tools
             ++ go-env
             ++ node-env
  -          ++ python-global
             ++ x11
             ++ games;
         };
  
positive.code:     ];
    };
  
    python-global = [
      (python27Full.buildEnv.override {
        extraLibs = with python27Packages; [
          jedi
        ];
      })
      (python3.buildEnv.override {
        extraLibs = with python35Packages; [
          jedi
        ];
      })
    ];
  
    games = pkg-set {
      linux = [
        (dwarf-fortress.override {
  
negative.code:       nmap
        fasd
        gnumake
        python27Full
        python3
      ];
  
      linux = [
  