anchor.diff:  
     # The list of packages to be installed
     tools = allPlatforms;
  -
   in
     if pkgs.lib.inNixShell
     then pkgs.mkShell
  
positive.code:       pkgs.bash
        pkgs.cacert
        pkgs.coreutils
        # pkgs.emacsGit
        pkgs.emacs
        pkgs.fasd
        pkgs.gawk
        pkgs.gnupg
        pkgs.jq
        pkgs.less
        pkgs.nix
        pkgs.nix-zsh-completions
        pkgs.nodejs               # TODO migrate globally installed node packages to Nix
  
negative.code:   allPlatforms = with custom;
      [
        # Customized packages
        emacs
        fzf
        git
        hub
  