anchor.diff:          libxml2
           lynx
           mu
  +        myEmacs
           nasm
           nix-prefetch-git
           offlineimap
  
positive.code:     # Emacs & emacs packages
      # ----------------------
  
      emacs =
        let
          myPackages = epkgs: (with epkgs.elpaPackages; [
            ace-window
  
negative.code:         cloc
          cmake
          ctags
          git
          graphviz
          htop
  