anchor.diff:    fullDepEntry = text: deps: {inherit text deps;};
     packEntry = deps: {inherit deps; text="";};
   
  -  # Old names - don't use.
  +  # Old names - don't use. Will be removed soon. There are no more occurences in nixpkgs/nixos
     FullDepEntry = fullDepEntry;
     PackEntry = packEntry;
     
  
positive.code: 
    You define you custom builder script by adding all build steps to a list.
    for example:
  	builder = writeScript "fsg-4.4-builder"
  		(textClosure [doUnpack addInputs preBuild doMake installPhase doForceShare]);
  
    a step is defined by noDepEntry, fullDepEntry or packEntry.
    To ensure that prerequisite are met those are added before the task itself by
  
negative.code: 
    See trace/nixpkgs/trunk/pkgs/top-level/builder-defs.nix for some predefined build steps
  
    Attention:
  
    let
      pkgs = (import /etc/nixos/nixpkgs/pkgs/top-level/all-packages.nix) {};
    in let
      inherit (pkgs.stringsWithDeps) fullDepEntry packEntry noDepEntry textClosureMap;
      inherit (pkgs.lib) id;
  
      nameA = noDepEntry "Text a";
      nameB = fullDepEntry "Text b" ["nameA"];
      nameC = fullDepEntry "Text c" ["nameA"];
  
      stages = {
        nameHeader = noDepEntry "#! /bin/sh \n";
        inherit nameA nameB nameC;
      };
    in
      textClosureMap id stages
      [ "nameHeader" "nameA" "nameB" "nameC"
        nameC # <- added twice. add a dep entry if you know that it will be added once only [1]
        "nameB" # <- this will not be added again because the attr name (reference) is used
      ]
  
    # result: Str("#! /bin/sh \n\nText a\nText b\nText c\nText c",[])
  
    [1] maybe this behaviour should be removed to keep things simple (?)
  */
  
  {stdenv, lib}:
  