anchor.diff:      { config, lib, pkgs, ... }:
       {
         environment.systemPackages =
  -        [ pkgs.lnl.vim
  +        [ pkgs.lnl.zsh
  +          pkgs.lnl.tmux
  +          pkgs.lnl.vim
             pkgs.curl
             pkgs.fzf
             pkgs.gettext
             pkgs.git
             pkgs.jq
             pkgs.silver-searcher
  -          pkgs.tmux
   
             pkgs.nix-repl
             pkgs.nox
  
positive.code: 
          setopt HIST_IGNORE_DUPS SHARE_HISTORY HIST_FCNTL_LOCK
  
          ${config.system.build.setEnvironment}
          ${config.system.build.setAliases}
  
  
negative.code: 
          if [ -n "$__ETC_ZSHENV_SOURCED" ]; then return; fi
          export __ETC_ZSHENV_SOURCED=1
  
          export NIX_PATH=nixpkgs=$HOME/.nix-defexpr/nixpkgs
  
  